Connecticut Subregional Drainage Basin Town Intersect

+ Resource Description

Citation

Information used to reference the data.

Title: Connecticut Subregional Drainage Basin Town Intersect

Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. This data is not updated. Source map scale is 1:24,000.

Larger Work Citation

Title: Natural Drainage Basins in Connecticut

Originators: Marianne McElroy, State of Connecticut, Department of Environmental Protection, Natural Resources Center

Series name: Connecticut Natural Resources Atlas Series

Series identification: Drainage Basins Map

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 1981

Data type: map

Data location: http://cteco.uconn.edu/map_catalog/maps/state/Natural_Drainage_Basins_In_Connecticut.pdf, http://cteco.uconn.edu/map_catalog/maps/state/Natural_Drainage_Basins_In_Connecticut_250K.pdf

Other citation details:

The Natural Drainage Basins in Connecticut map is published by the State of Connecticut, Department of Environmental Protection, Natural Resources Center in cooperation with the U.S. Geological Survey. The map was funded in part by the Water Resources Council. Map scale 1:125,000.

Description

A characterization of the data, including its intended use and limitations.

Abstract:

Connecticut Subregional Drainage Basin Town Intersect is 1:24,000-scale data that is the geographic intersection of subregional drainage basins and towns in Connecticut. It includes polygon features that define where the Connecticut Subregional Drainage Basin Poly and Connecticut Town Polygon layers intersect and overlap each other. The geographic area covered includes the Connecticut mainland and islands along the Connecticut coastline. The total geographic area covered by all polygon features is 4,967.56 square miles. Data is compiled at 1:24,000 scale (1 inch = 2,000 feet). This is static information that is not updated.

Polygon feature attributes include basin number and name, town number and name, and feature size in acres and square miles. Each polygon feature includes the 1-digit major (MBAS_NO), 2-digit regional (RBAS_NO), 4-digit subregional (SBAS_NO) drainage basin number, and the Connecticut Town number (TOWN_NO). Subregional drainage basins typically are located in more than one town and a town will include more than one basin. A polygon feature exists for each subregional basin - town occurrence.

Connecticut Subregional Drainage Basin Town Intersect is derived from the intersection of the geometry and attributes of the Connecticut Subregional Drainage Basins for Clipping and Connecticut Town Polygon feature classes.

Purpose:

These data are used for geoprocessing and analysis purposes. They function as a two-way index of basins and towns, identifying the towns each subregional drainage basin is located in as well as identifying the subregional drainage basins located in each town. A town can be analyzed relative to basins, or a basin can be analyzed relative to towns. A polygon feature exists for each area where a subregional basin overlaps a town. If a basin is located in two different parts of town, a polygon feature will exist for each. Polygon feature size is available in square miles or acres so basin occurrence as a percent of town area can be determined.

These data are intended for analysis with other digital data compiled at 1:24,000 scale or greater.

Supplemental information:

A standardized mapping of natural drainage basins in Connecticut was completed in 1981 by the Connecticut Department of Environmental Protection. This drainage basin system divided Connecticut into 8 major basins, 45 regional basins, 337 subregional basins, 2,898 local basins, and 7,067 small drainage basin areas. Major basins are subdivided into regional basins. Regional basins are subdivided into subregional basins. Subregional basins are subdivided into local basins. Local basins are subdivided into smaller drainage basin areas for impoundments and river reaches. 

A pair of 1:24,000-scale polygon and line feature classes is available for all basin levels. These data are named Connecticut Major Basins, Connecticut Regional Basins, Connecticut Subregional Basins, Connecticut Local Basins, and Connecticut Drainage Basins. Connecticut Drainage Basins includes the most detailed information upon which the other basin datasets are based.

A hierarchical drainage basin number was assigned to uniquely identify drainage basin areas. Drainage basin areas are numbered sequentially beginning upstream and proceeding downstream. The first digit (column 1) identifies the major basin, the first two digits (columns 1-2) identify the regional basin, the first 4 digits (columns 1-4) identify the subregional basin, and the first seven digits (columns 1-7) identify the local basin. Below are examples of the hierarchical drainage basin numbers.

Basin Numbers:

4 = Major drainage basin number, MBAS_NO (column 1)
43 = Regional drainage basin number, RBAS_NO (columns 1-2)
4302 = Subregional drainage basin number, SBAS_NO (columns 1-4)
4302-04 = Local drainage basin number, LBAS_NO (columns 1-7)
4302-04-1-R12 = Basin drainage identification number, BASIN_NO (columns 1-13)

Stream Order (column 9):

4304-00-1 = Stream order value of 1 represents a headwater basin.
4304-00-2 = Stream order value > 1 denotes the complexity of the drainage basin morphology.

Mapping Status Element (column 10):

4302-00-2- = Ending with minus sign (-) denotes detail mapping at 1:24,000 scale for entire basin.

4302-00-2+ = Ending with plus sign (+) denotes detailed mapping not performed at 1:24,000 scale for the entire drainage basin. The Stream Order value will not reflect the complexity of the drainage basin morphology.

4302-00-1* = Ending with asterisk sign (*) denotes a headwater basin containing a delineated impoundment into which a delineated drainage basin outlets.

Reach-Impoundment Identifier (column11) and Number (column 12-13):

4302-00-1-L1 = The value for the Reach-Impoundment Identifier for an impounment basin is L (for lake). It is followed by the Reach-Impoundment Number (1).

4302-04-1-R12 = The value for the Reach-Impoundment Identifier for a stream reach basin is R (for reach). It is followed the Reach-Impoundment Number (12).

Dataset credit:

Tom Nosal, State of Connecticut, Department of Environmental Protection, for the final compilation and delineation of 1:24,000-scale drainage basin boundaries, assignment of drainage basin numbers, and conversion to digitial format. Basin boundaries were manually delineated at 1:24,000-scale by visually interpreting the 10 feet contour elevation lines and waterbody features appearing on 1:24,000-scale 7.5 minute USGS topographic quadrangle maps for Connecticut published between 1969 and 1984. The metadata abstract includes a brief description of a drainage basin obtained from material written by Jim Murphy in an article entitled Reading the Landscape published in the Citizen's Bulletin, a CT DEP monthy magazine.

Language of dataset: en

Point Of Contact

Contact information for the individual or organization that is knowledgeable about the data.

Organization: State of Connecticut, Department of Environmental Protection

Person: Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Email: dep.gisdata@ct.gov

Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106-5127

Country: USA

Data Type

How the data are represented, formatted and maintained by the data producing organization.

File or table name: depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT

Data type: vector digital data

Data format: SDE Feature Class

Native dataset environment: These data are maintained by the State of Connecticut using ArcGIS software developed by Environmental Systems Research Institute (ESRI) in a Microsoft Windows operating system environment.

Time Period of Data

Time period(s) for which the data corresponds to the currentness reference.

Date: 1988

Currentness reference:

publication date

Status

The state of and maintenance information for the data.

Data status: Complete

Update frequency: None planned

Key Words

Words or phrases that summarize certain aspects of the data.

Theme:

Keywords: drainage basin, drainage area, watershed, basin divide, major, regional, subregional, local, gazetteer , politcal boundary, state, town, municipality

Keyword thesaurus: None

Theme:

Keywords: boundaries, elevation, inlandWaters

Keyword thesaurus: ISO 19115 Topic Category

Place:

Keywords: United States, Connecticut, CT

Keyword thesaurus: U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.

Place:

Keywords: United States of America, USA

Keyword thesaurus: U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.

Data Access Constraints

Restrictions and legal prerequisites for accessing or using the data after access is granted.

Access constraints:

None. The data is in the public domain and may be redistributed.

Use constraints:

No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set  has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Environmental Protection as the source for this information. For example, include the following data source description when this layer is used in analysis or when printed on a map: Basins - From the Subregional Drainage Basin Town Intersect layer, compiled and published by CT DEP. Source map scale is 1:24,000.

Cross Reference

Information about other, related data sets that are likely to be of interest.

Title: Gazetteer of Drainage Basin Areas of Connecticut

Originators: Tom Nosal, Department of Environmental Protection, State of Connecticut (compiler and publisher)

Series name: Water Resources Bulletin

Series identification: No 15

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 19970101

Data type: document

Other citation details:

Gazetteer of Drainage Basin Areas of Connecticut is organized by the eight major drainage basins covering Connecticut. The individual basins that comprise each major basin are listed in hydrologic sequence, headwater to outfall, with drainage basin number, description, basin area, and cummulative drainage area listed for each individual basin.

+ Graphic Example

Browse Graphic

Graphic illustration of the data.

Browse graphic 1

Open - Full view of Connecticut Subregional Basin Town Intersect. Data is limited to the State of Connecticut. Each feature includes subregional drainage basin and town number and name.

Browse graphic 2

Open - Detail view of Connecticut Subregional Basin Town Intersect.

Browse graphic 3

Open - Detail view of Connecticut Subregional Basin Town Intersect with features for the Town of Clinton outlined. Features are labeled with the 4-digit subregional drainage basin number and town name.

+ Spatial Reference Information

Horizontal Coordinate System

Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.

Projected coordinate system:

Name: NAD 1983 StatePlane Connecticut FIPS 0600 Feet

Map units: survey feet

Geographic coordinate system:

Name: GCS North American 1983

Coordinate System Details

Map projection

Map projection name: Lambert Conformal Conic

Standard parallel: 41.200000

Standard parallel: 41.866667

Longitude of central meridian: -72.750000

Latitude of projection origin: 40.833333

False easting: 999999.999996

False northing: 499999.999998

Planar Coordinate Information

Planar coordinate encoding method: coordinate pair

Coordinate representation:

Abscissa resolution: 0.000250

Ordinate resolution: 0.000250

Planar distance units: survey feet

Geodetic model

Horizontal datum name: North American Datum of 1983

Ellipsoid name: Geodetic Reference System 80

Semi-major axis: 6378137.000000

Denominator of flattening ratio: 298.257222

Vertical Coordinate System

Reference system from which vertical distances (altitudes or depths) are measured.

Altitude system definition:

Altitude resolution: 1.000000

Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

Spatial Domain

The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.

Bounding Coordinates

In Projected or local coordinates

NAD 1983 StatePlane Connecticut FIPS 0600 Feet

Boundary	Coordinate
Left	730512.188000 (survey feet)
Right	1263094.375000 (survey feet)
Top	944279.125000 (survey feet)
Bottom	554854.688000 (survey feet)

In Unprojected coordinates (geographic)

GCS North American 1983

Boundary	Coordinate
West	-73.742172 (longitude)
East	-71.781365 (longitude)
North	42.052612 (latitude)
South	40.979708 (latitude)

+ Data Structure and Attribute Information

Overview

Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.

Entity and attribute overview:

Information encoded for drainage basin polygon features generally includes drainage basin number and name, town number and name, and feature size. The SBAS_NO uniquely identifes subreginal drainage basins and uniquely identifies each polygon feature. It represents the first 4 digits of the 13 digit BASIN_NO. The drainage basin numbering system is hierarchical. Use the MBAS_NO and RBAS_NO attributes to identify the major and regional drainage basin for each subregional drainage basin feature. The TOWN_NO identifies the Connecticut Town the basin feature is located in. Typically basins are located in more than one town and a town will include more than one basin so there is a polygon feature for each subregional basin - town occurrence. Use the AREA_SQMI and ACREAGE attributes to determine drainage basin - town polygon feature size. These values reflect the area of the respective polygon feature. They do not reflect the cumulative (upstream) drainage area for each basin. Note, ACREAGE and AREA_SQMI values are not automatically updated after modifying feature geometry (shape). These values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.

Entity and attribute detailed citation:

Basin Numbers:

4 = Major drainage basin number, MBAS_NO (column 1)
43 = Regional drainage basin number, RBAS_NO (columns 1-2)
4302 = Subregional drainage basin number, SBAS_NO (columns 1-4)
4302-04 = Local drainage basin number, LBAS_NO (columns 1-7)
4302-04-1-R12 = Basin drainage identification number, BASIN_NO (columns 1-13)

Stream Order (column 9):

4304-00-1 = Stream order value of 1 represents a headwater basin.
4304-00-2 = Stream order value > 1 denotes the complexity of the drainage basin morphology.

Mapping Status Element (column 10):

4302-00-2- = Ending with minus sign (-) denotes detail mapping at 1:24,000 scale for entire basin.

4302-00-2+ = Ending with plus sign (+) denotes detailed mapping not performed at 1:24,000 scale for the entire drainage basin. The Stream Order value will not reflect the complexity of the drainage basin morphology.

4302-00-1* = Ending with asterisk sign (*) denotes a headwater basin containing a delineated impoundment into which a delineated drainage basin outlets.

Reach-Impoundment Identifier (column11) and Number (column 12-13):

4302-00-1-L1 = The value for the Reach-Impoundment Identifier for an impounment basin is L (for lake). It is followed by the Reach-Impoundment Number (1).

4302-04-1-R12 = The value for the Reach-Impoundment Identifier for a stream reach basin is R (for reach). It is followed the Reach-Impoundment Number (12).

Entity and attribute detailed citation:

Connecticut Town numbers, based on the Town Codes issued by the State of Connecticut, range from 1 to 169 in the following order:

Andover (1), Ansonia (2), Ashford (3), Avon (4), Barkhamsted (5), Beacon Falls (6), Berlin (7), Bethany (8), Bethel (9), Bethlehem (10), Bloomfield (11), Bolton (12), Bozrah (13), Branford (14), Bridgeport (15), Bridgewater (16), Bristol (17), Brookfield (18), Brooklyn (19), Burlington (20), Canaan (21), Canterbury (22), Canton (23), Chaplin (24), Cheshire (25), Chester (26), Clinton (27), Colchester (28), Colebrook (29), Columbia (30), Cornwall (31), Coventry (32), Cromwell (33), Danbury (34), Darien (35), Deep River (36), Derby (37), Durham (38), Eastford (39), East Granby (40), East Haddam (41), East Hampton (42), East Hartford (43), East Haven (44), East Lyme (45), Easton (46), East Windsor (47), Ellington (48), Enfield (49), Essex (50), Fairfield (51), Farmington (52), Franklin (53), Glastonbury (54), Goshen (55), Granby (56), Greenwich (57), Griswold (58), Groton (59), Guilford (60), Haddam (61), Hamden (62), Hampton (63), Hartford (64), Hartland (65), Harwinton (66), Hebron (67), Kent (68), Killingly (69), Killingworth (70), Lebanon (71), Ledyard (72), Lisbon (73), Litchfield (74), Lyme (75), Madison (76), Manchester (77), Mansfield (78), Marlborough (79), Meriden (80), Middlebury (81), Middlefield (82), Middletown (83), Milford (84), Monroe (85), Montville (86), Morris (87), Naugatuck (88), New Britain (89), New Canaan (90), New Fairfield (91), New Hartford (92), New Haven (93), Newington (94), New London (95), New Milford (96), Newtown (97), Norfolk (98), North Branford (99), North Canaan (100), North Haven (101), North Stonington (102), Norwalk (103), Norwich (104), Old Lyme (105), Old Saybrook (106), Orange (107), Oxford (108), Plainfield (109), Plainville (110), Plymouth (111), Pomfret (112), Portland (113), Preston (114), Prospect (115), Putnam (116), Redding (117), Ridgefield (118), Rocky Hill (119), Roxbury (120), Salem (121), Salisbury (122), Scotland (123), Seymour (124), Sharon (125), Shelton (126), Sherman (127), Simsbury (128), Somers (129), Southbury (130), Southington (131), South Windsor (132), Sprague (133), Stafford (134), Stamford (135), Sterling (136), Stonington (137), Stratford (138), Suffield (139), Thomaston (140), Thompson (141), Tolland (142), Torrington (143), Trumbull (144), Union (145), Vernon (146), Voluntown (147), Wallingford (148), Warren (149), Washington (150), Waterbury (151), Waterford (152), Watertown (153), Westbrook (154), West Hartford (155), West Haven (156), Weston (157), Westport (158), Wethersfield (159), Willington (160), Wilton (161), Winchester (162), Windham (163), Windsor (164), Windsor Locks (165), Wolcott (166), Woodbridge (167), Woodbury (168), and Woodstock (169).

Direct spatial reference method: Vector

Indirect spatial reference method: Connecticut DEP Major Basin Number, Regional Basin Number, Subregional Basin Number, Local Basin Number, Basin Number

Attributes of Connecticut Subregional Drainage Basin Town Intersect

Detailed descriptions of entity type, attributes, and attribute values for the data.

Name: depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT

Type of object: Feature Class

Geometry type: Polygon

Number of records: 2099

Description:

Polygon features depict the intersection and overlap of Connecticut Subregional drainage basins and Connecticut towns (municipalities). There is one polygon feature for each subregional drainage basin - town combination, including one for each coastal island identifying both the town the island is located in and the coastal subregional basin the island is offshore of.

Source:

State of Connecticut, Department of Environmental Protection

Attributes

OBJECTID

Definition:

Internal feature number.

Alias: OBJECTID Type: OID Width: 4 Precision: 10 Scale: 0

Attribute values: Sequential unique whole numbers that are automatically generated.

Attribute definition source:

ESRI

SHAPE

Definition:

Feature geometry.

Alias: Shape Type: Geometry Width: 4 Precision: 0 Scale: 0

Attribute values: Coordinates defining the features.

Attribute definition source:

ESRI

SBAS_NO

Definition:

Subregional Drainage Basin Number - This number defines the Subregional drainage basin and is the first 4 digits of the 13-digit drainage basin identification number (BASIN_NO). The first digit corresponds to the Major basin number (MBAS_NO) and the first 2 digits represent the Regional basin number (RBAS_NO). All Subregional basins in the same Major and Regional basin have the same first and first 2 digits, respectively. A Subregional drainage basin number ending in "00" defines the main-stem basin for the corresponding Regional drainage basin. For example, Subregional basin 4300 is the main-stem basin for Regional basin 43. These main-stem Subregional basins are usually named after the corresponding Regional basin.

Alias: SBAS_NO Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 4

Attribute domain values

Value	Definition
1000	Pawcatuck River
1001	Wyassup Brook
1002	Green Fall River
1003	Ashaway River
1004	Shunock River
1100	Wood River
1101	Brushy Brook
2000	Southeast Shoreline
2101	Anguilla Brook
2102	Copps Brook
2103	Williams Brook
2104	Whitford Brook
2105	Haleys Brook
2106	Mystic River
2107	Great Brook
2201	Jordan Brook
2202	Latimer Brook
2203	Oil Mill Brook
2204	Niantic River
2205	Pattagansett River
2206	Bride Brook
2207	Fourmile River
3000	Thames River
3001	Trading Cove Brook
3002	Shewville Brook
3003	Poquetanuck Brook
3004	Oxoboxo Brook
3005	Stony Brook
3006	Hunts Brook
3100	Willimantic River
3101	Edson Brook
3102	Middle River
3103	Furnace Brook
3104	Roaring Brook
3105	Mill Brook
3106	Skungamaug River
3107	Burnap Brook
3108	Hop River
3109	Giffords Brook
3110	Tenmile River
3200	Natchaug River
3201	Bungee Brook
3202	Still River
3203	Bigelow Brook
3204	Stonehouse Brook
3205	Squaw Hollow Brook
3206	Mount Hope River
3207	Fenton River
3208	Sawmill Brook
3300	French River
3301	Mill Brook
3400	Fivemile River
3401	Rocky Brook
3402	Mary Brown Brook
3403	Cady Brook
3404	Whetstone Brook
3500	Moosup River
3501	Quanduck Brook
3502	Snake Meadow Brook
3503	Ekonk Brook
3600	Pachaug River
3601	Great Meadow Brook
3602	Mount Misery Brook
3603	Denison Brook
3604	Myron Kinney Brook
3605	Billings Brook
3700	Quinebaug River
3701	Hamilton Reservoir Brook
3702	Breakneck Brook
3703	Hatchet Brook
3704	Cohasse Brook
3705	Lebanon Brook
3706	English Neighborhood Brook
3707	Mill Brook
3708	Little River
3709	Wappoquia Brook
3710	Mashamoquet Brook
3711	Blackwell Brook
3712	Fry Brook
3713	Mill Brook
3714	Kitt Brook
3715	Cory Brook
3716	Broad Brook
3717	Choate Brook
3800	Shetucket River
3801	Indian Hollow Brook
3802	Beaver Brook
3803	Merrick Brook
3804	Beaver Brook
3805	Little River
3900	Yantic River
3901	Exeter Brook
3902	Bartlett Brook
3903	Sherman Brook
3904	Deep River
3905	Pease Brook
3906	Gardner Brook
3907	Susquetonscut Brook
4000	Connecticut River
4001	Great Brook
4002	Threemile Brook
4003	Freshwater Brook
4004	Podunk River
4005	Folly Brook
4006	Salmon Brook
4007	Hubbard Brook
4008	Cold Brook
4009	Roaring Brook
4010	Goff Brook
4011	Reservoir Brook
4012	Carr Brook
4013	Sumner Brook
4014	Higganum Creek
4015	Mill Creek
4016	Whalebone Creek
4017	Chester Creek
4018	Deep River
4019	Falls River
4020	Lieutenant River
4021	Black Hall River
4100	Stony Brook
4101	Muddy Brook
4200	Scantic River
4201	Watchaug Brook
4202	Gillettes Brook
4203	Gulf Stream
4204	Abbey Brook
4205	Buckhorn Brook
4206	Broad Brook
4207	Ketch Brook
4300	Farmington River
4301	Slocum Brook
4302	Mad River
4303	Still River
4304	Sandy Brook
4305	Morgan Brook
4306	Valley Brook
4307	Hubbard Brook
4308	East Branch Farmington River
4309	Cherry Brook
4310	Nepaug River
4311	Burlington Brook
4312	Roaring Brook
4313	Poland River
4314	Copper Mine Brook
4315	Pequabuck River
4316	Thompson Brook
4317	Nod Brook
4318	Hop Brook
4319	West Branch Salmon Brook
4320	Salmon Brook
4321	Mill Brook
4400	Park River
4401	Bass Brook
4402	Piper Brook
4403	Trout Brook
4404	North Branch Park River
4500	Hockanum River
4501	Charters Brook
4502	Marsh Brook
4503	Tankerhoosen River
4504	South Fork Hockanum River
4600	Mattabesset River
4601	Belcher Brook
4602	Willow Brook
4603	Webster Brook
4604	Sawmill Brook
4605	Allyn Brook
4606	Sawmill Brook
4607	Coginchaug River
4700	Salmon River
4701	Raymond Brook
4702	Judd Brook
4703	Meadow Brook
4704	Pine Brook
4705	Jeremy River
4706	Fawn Brook
4707	Blackledge River
4708	Dickinson Creek
4709	Pine Brook
4710	Moodus River
4800	Eightmile River
4801	Harris Brook
4802	East Branch Eightmile River
4803	Beaver Brook
5000	South Central Shoreline
5101	Oyster River
5102	Patchogue River
5103	Menunketesuck River
5104	Indian River
5105	Chatfield Hollow Brook
5106	Hammonasset River
5107	Neck River
5108	East River
5109	Sluice Creek
5110	West River
5111	Branford River
5112	Farm River
5200	Quinnipiac River
5201	Eightmile River
5202	Tenmile River
5203	Misery Brook
5204	Broad Brook
5205	Sodom Brook
5206	Harbor Brook
5207	Wharton Brook
5208	Muddy River
5301	Willow Brook
5302	Mill River
5303	Sargent River
5304	Wintergreen Brook
5305	West River
5306	Indian River
5307	Wepawaug River
6000	Housatonic River
6001	Sages Ravine Brook
6002	Schenob Brook
6003	Andrus Brook
6004	Konkapot River
6005	Factory Brook
6006	Spruce Swamp Creek
6007	Salmon Creek
6008	Mill Brook
6009	Carse Brook
6010	Furnace Brook
6011	Guinea Brook
6012	Kent Falls Brook
6013	Cobble Brook
6014	Bog Hollow Brook
6015	Macedonia Brook
6016	Womenshenuk Brook
6017	Morrissey Brook
6018	Pond Brook
6019	Deep Brook
6020	Pootatuck River
6021	Kettletown Brook
6022	Halfway River
6023	Eightmile Brook
6024	Means Brook
6025	Farmill River
6026	Pumpkin Ground Brook
6100	Blackberry River
6101	Whiting River
6200	Hollenbeck River
6201	Brown Brook
6202	Wangum Lake Brook
6300	Tenmile River
6301	Indian Lake Creek
6302	Mill Brook
6303	Webatuck Creek
6304	Deuel Hollow Brook
6305	Mill River
6306	Swamp River
6400	Lake Candlewood
6401	Sawmill Brook
6402	Ball Pond Brook
6500	West Aspetuck River
6501	Merryall Brook
6502	East Aspetuck River
6600	Still River
6601	Miry Brook
6602	Boggs Pond Brook
6603	Padanaram Brook
6604	Sympaug Brook
6605	East Swamp Brook
6606	Limekiln Brook
6700	Shepaug River
6701	Marshepaug River
6702	West Branch Shepaug River
6703	West Branch Bantam River
6704	Butternut Brook
6705	Bantam River
6706	Jacks Brook
6800	Pomperaug River
6801	East Spring Brook
6802	Nonewaug River
6803	Sprain Brook
6804	Weekeepeemee River
6805	Hesseky Brook
6806	Transylvania Brook
6900	Naugatuck River
6901	Hall Meadow Brook
6902	Hart Brook
6903	Nickel Mine Brook
6904	West Branch Naugatuck River
6905	East Branch Naugatuck River
6906	Spruce Brook
6907	Rock Brook
6908	Leadmine Brook
6909	Northfield Brook
6910	Branch Brook
6911	Hancock Brook
6912	Steele Brook
6913	Beaver Pond Brook
6914	Mad River
6915	Fulling Mill Brook
6916	Hop Brook
6917	Long Meadow Pond Brook
6918	Beacon Hill Brook
6919	Bladens River
6920	Little River
7000	Southwest Shoreline
7101	Lewis Gut
7102	Bruce Brook
7103	Yellow Mill Channel
7104	Booth Hill Brook
7105	Pequonnock River
7106	Ash Creek
7107	Cricker Brook
7108	Mill River
7109	Sasco Brook
7200	Saugatuck River
7201	Little River
7202	Aspetuck River
7203	West Branch Saugatuck River
7300	Norwalk River
7301	Comstock Brook
7302	Silvermine River
7401	Fivemile River
7402	Darien River
7403	Noroton River
7404	Mill River
7405	Rippowam River
7406	East Branch Mianus River
7407	Mianus River
7408	Greenwich Creek
7409	Horseneck Brook
7410	East Branch Byram River
7411	Byram River
7412	Blind Brook
8000	Hudson River
8100	Croton River
8101	Quaker Brook
8102	Corner Pond Brook
8103	East Branch Croton River
8104	Titicus River
8105	Waccabuc River

Attribute definition source:

State of Connecticut, Department of Environmental Protection

SUBREGION

Definition:

Subregional Drainage Basin Name - Text values that correspond to numeric SBAS_NO attribute values. SUBREGION is the English language equivalent of (decodes) the SBAS_NO field.

Alias: SUBREGION Type: String Width: 30 Precision: 0 Scale: 0Output width: 30

Attribute values: See Enumerated Domain Value Definitions for SBAS_NO attribute.

Attribute definition source:

State of Connecticut, Department of Environmental Protection

RBAS_NO

Definition:

Regional Drainage Basin Number - This number defines the Regional drainage basin and is the first 2 digits of the 13-digit drainage basin identification number (BASIN_NO). The first digit corresponds to the Major basin number (MBAS_NO). All Regional basins in the same Major basin have the same first digit. A Regional drainage basin number ending in "0" defines the greater main-stem basin for the corresponding Major drainage basin. For example, Regional basin 40 is the main-stem basin for Major basin 4. These main-stem Regional basins are usually named after the corresponding Major basin.

Alias: RBAS_NO Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 2

Attribute domain values


Pawcatuck Main Stem
Wood
Southeast Shoreline
Southeast Eastern Complex
Southeast Western Complex
Thames Main Stem
Willimantic
Natchaug
French
Fivemile
Moosup
Pachaug
Quinebaug
Shetucket
Yantic
Connecticut Main Stem
Stony Brook
Scantic
Farmington
Park
Hockanum
Mattabesset
Salmon
Eightmile
South Central Shoreline
South Central Eastern Complex
Quinnipiac
South Central Western Complex
Housatonic Main Stem
Blackberry
Hollenbeck
Tenmile
Candlewood
Aspetuck
Still
Shepaug
Pomperaug
Naugatuck
Southwest Shoreline
Southwest Eastern
Saugatuck
Norwalk
Southwest Western Complex
Hudson Main Stem
Croton

Value	Definition
10	Pawcatuck Main Stem
11	Wood
20	Southeast Shoreline
21	Southeast Eastern Complex
22	Southeast Western Complex
30	Thames Main Stem
31	Willimantic
32	Natchaug
33	French
34	Fivemile
35	Moosup
36	Pachaug
37	Quinebaug
38	Shetucket
39	Yantic
40	Connecticut Main Stem
41	Stony Brook
42	Scantic
43	Farmington
44	Park
45	Hockanum
46	Mattabesset
47	Salmon
48	Eightmile
50	South Central Shoreline
51	South Central Eastern Complex
52	Quinnipiac
53	South Central Western Complex
60	Housatonic Main Stem
61	Blackberry
62	Hollenbeck
63	Tenmile
64	Candlewood
65	Aspetuck
66	Still
67	Shepaug
68	Pomperaug
69	Naugatuck
70	Southwest Shoreline
71	Southwest Eastern
72	Saugatuck
73	Norwalk
74	Southwest Western Complex
80	Hudson Main Stem
81	Croton

Attribute definition source:

State of Connecticut, Department of Environmental Protection

REGIONAL

Definition:

Regional Drainage Basin Name - Text values that correspond to numeric RBAS_NO attribute values. REGIONAL is the English language equivalent of (decodes) the RBAS_NO field.

Alias: REGIONAL Type: String Width: 30 Precision: 0 Scale: 0Output width: 30

Attribute values: See Enumerated Domain Value Definitions for RBAS_NO attribute.

Attribute definition source:

State of Connecticut, Department of Environmental Protection

MBAS_NO

Definition:

Major Drainage Basin Number - This number defines the major drainage basin and is the first digit of the 13-digit drainage basin identification number (BASIN_NO). There are 8 Major basins.

Alias: MBAS_NO Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 1

Attribute domain values


Pawcatuck
Southeast Coast
Thames
Connecticut
South Central Coast
Housatonic
Southwest Coast
Hudson

Value	Definition
1	Pawcatuck
2	Southeast Coast
3	Thames
4	Connecticut
5	South Central Coast
6	Housatonic
7	Southwest Coast
8	Hudson

Attribute definition source:

State of Connecticut, Department of Environmental Protection

MAJOR

Definition:

Major Drainage Basin Name - Text values that correspond to numeric MBAS_NO attribute values. MAJOR is the English language equivalent of (decodes) the MBAS_NO field.

Alias: MAJOR Type: String Width: 20 Precision: 0 Scale: 0Output width: 20

Attribute values: See Enumerated Domain Value Definitions for MBAS_NO attribute.

Attribute definition source:

State of Connecticut, Department of Environmental Protection

TOWN_NO

Definition:

Town Number - ID number for the Connecticut Town (municipality), based on the Town Codes issued by the State of Connecticut, Office of the State Controller, which range from 1 to 169.

Alias: TOWN_NO Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 3

Attribute values: Numeric value ranging from 1 to 169.

Attribute definition source:

State of Connecticut, Office of the State Controller

TOWN

Definition:

Town Name - Text values that correspond to numeric TOWN_NO attribute values. TOWN is the English language equivalent of (decodes) the TOWN_NO field.

Alias: TOWN Type: String Width: 16 Precision: 0 Scale: 0Output width: 16

Attribute values: Text value (town name).

Attribute definition source:

State of Connecticut, Office of the State Controller

ACREAGE

Definition:

Calculated area of polygon feature in acres. Note, ACREAGE values are not automatically updated after modifying feature geometry (shape). Values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.

Alias: ACREAGE Type: Double Width: 8 Precision: 38 Scale: 8Output width: 12

Attribute values: Numeric value

Attribute definition source:

State of Connecticut, Department of Environmental Protection

AREA_SQMI

Definition:

Calculated area of polygon feature in square miles. Note, AREA_SQMI values are not automatically updated after modifying feature geometry (shape). Values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.

Alias: AREA_SQMI Type: Double Width: 8 Precision: 38 Scale: 8Output width: 12

Attribute values: Numeric value

Attribute definition source:

State of Connecticut, Department of Environmental Protection

SHAPE.area

Alias: SHAPE.area Type: Double Width: 0 Precision: 0 Scale: 0

SHAPE.len

Alias: SHAPE.len Type: Double Width: 0 Precision: 0 Scale: 0

ESRI Feature Description

Description of spatial objects in the data using the Environmental Systems Research Institute (ESRI) terminology.

Environmental Systems Research Institute (ESRI) terms

depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT

ESRI feature type: Simple

Geometry type: Polygon

Topology: FALSE

Feature count: 2099

Spatial index: TRUE

Linear referencing: FALSE

SDTS Feature Description

Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.

Spatial data transfer standard (SDTS) terms

depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT

Type: G-polygon

Count: 2099

+ Data Quality and Accuracy Information

General

Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.

Logical consistency report:

Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. Lines are single part. Line features conform to the following topological rules. There are no duplicate lines. Lines do not self overlap. Lines do not overlap other lines. Lines intersect only at nodes, and nodes anchor the ends of all lines. Lines do not overshoot or undershoot other lines they are supposed to meet and intersect. In general, there are no duplicate features, unresolved intersections, overshooting lines, open polygons, sliver polygons, or unlabeled (unattributed) polygons. The tests of logical consistency were performed by the State of Connecticut using ESRI ArcInfo software to maintain feature topology in ArcInfo coverage format. The data is topologically clean. The ArcInfo Clean function was repeatedly used following edits to verify topology and enforce a minimum distance between vertices of 4 feet (fuzzy tolerance) and a minimum allowed overshoot length of 0 feet (dangle length).

Completeness report:

The data reflects the content of the data source, which is a set of 1:24,000 scale mylar sheets used to compile and publish the 1:125,000-scale Drainage Basins in Connecticut Map, McElroy, 1982. All major, regional, subregional, local and smaller basin divides were digitized from these 1:24,000-scale mylar compilation sheets. This data is not updated.

Attribute Accuracy

Accuracy of the identification of data entities, features and assignment of attribute values.

Attribute accuracy report:

The primary data source for basin information in the Connecticut Subregional Drainage Basin Town Intersect feature class is the Connecticut Drainage Basins layer. The Connecticut Drainage Basins layer retains the feature types and information identified on the 1:24,000-scale compilation sheets for the Natural Drainage Basins in Connecticut map, McElroy, 1981. All attributes have valid values. Values are within defined domains. There are no duplicate LBASIN_NO values except where expected (see definition of LBASIN_NO attribute).

The SBASIN_NO is derived from the first 4-digits of BASIN_NO so the accuracy of the SBASIN_NO is dependent on that for the BASIN_NO. For polygon features, the accuracy test for the BASIN_NO attribute values was conducted by visually comparing the basin number information depicted on the source Mylar overlays with 1:24,000-scale check plots or interactive displays of the digital data on a computer graphic system. These check plot maps and computer displays labeled polygon features with BASIN_NO values and differentiated line features based on DBARC_COD values for comparison with the original source Mylars. Subsequently, four additional fields (MBAS_NO, RBAS_NO, SBAS_NO, LBAS_NO) were added and populated based on the first, first 2, first 4, and first 7 columns of the BASIN_NO attribute. The MAJOR, REGIONAL, and SUBREGION attributes store drainage basin names based on MBAS_NO, RBAS_NO, SBAS_NO values, respectively. Basin names were attributed by joining basin name lookup tables to the polygon features base on MBAS_NO, RBAS_NO, SBAS_NO key values and populating the corresponding fields. These basin names are from the Natural Drainage Basins in Connecticut map, McElroy, 1981. The AREA_SQMI (area in square miles) and ACREAGE (area in acres) field were automatically calculated for each polygon feature based on computer generated feature area in square feet.

The primary data source for the town attribute information is the Connecticut Town Poly feature class. Refer to this feature class metadata for town number and name attribute accuracy report information.

Positional Accuracy

Accuracy of the positional aspects of the data.

Horizontal accuracy report:

The horizontal positional accuracy of this data complies with the United States National Map Accuracy Standards for 1:24,000 scale maps. According to this standard, not more than 10 percent of the locations tested are to be in error by more than 1/50 inch (40 feet) measured on the publication scale of a USGS 7.5 minute topographic quadrangle map.

Drainage basin boundaries were interpolated from 10 FT elevation contours and surface water body (hydrography) information published on a set of USGS 1:24,000-scale, 7.5-minute topographic quadrangle maps that cover the State of Connecticut. Natural drainage basin boundaries were manually delineated by interpolating elevation and water body information found on topographic quadrangle maps published by the USGS between 1962 and 1984.

+ Data Source and Process Information

Data Sources

Information about the source data used to construct or derive the data.

Data source information

Source 1 - Source Materials

Title: drainage basin compilation sheets

Originators: State of Connecticut, Department of Environmental Protection

Publication date: Unpublished Material

Data type: stable base mylar

Map scale denominator: 24000

Media: stable-base material

Source contribution:

Basins compiled on 1:24,000-scale 7.5 minute USGS quadrangle area mylar overlays.

Source 2 - Drainage Basins

Title: Connecticut Drainage Basins

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled and digitized from the 1:24,000-scale compilation sheets for the 1:125,000-scale Natural Drainage Basins in Connecticut Map, McElroy, 1981. The 2006 Edition includes the same basin features originally published in 1988 with some minor corrections and improvements made to feature attribute information. Previously undetected errors have been corrected and are included in this 2006 edition. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Drainage Basins is in ArcInfo Coverage format having both polygon and line features. The name of the ArcInfo Coverage is BASIN.

Date: 1988

Currentness reference:

publication date

Source 3 - Subregional Drainage Basins

Title: Connecticut Subregional Drainage Basins

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled and digitized from the 1:24,000-scale compilation sheets for the 1:125,000-scale Natural Drainage Basins in Connecticut Map, McElroy, 1981. The 2006 Edition includes the same basin features originally published in 1988 with some minor corrections and improvements made to feature attribute information. Previously undetected errors have been corrected and are included in this 2006 edition. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Subregional Drainage Basins is in ArcInfo Coverage format having both polygon and line features. The name of the ArcInfo Coverage is SBASIN. These polygon and line feature data were subsequently converted to geodatabase feature format and named SUBREGIONAL_BASIN_POLY and SUBREGIONAL_BASIN_LINE, respectively.

Date: 1988

Currentness reference:

publication date

Source 4 - Connecticut State Poly

Title: Connecticut State Polygon

Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 19940101

Edition: 2005

Data type: vector digital data

Data location: http://www.ct.gov/deep

Map scale denominator: 24000

Media: disc

Source contribution:

A polygon feature-based layer that depicts the geographic area for the State of Connecticut as one polygon feature. Connecticut State Poly is in Geodatabase Feature Class format.

Beginning date: 1969

Ending date: 1984

Currentness reference:

publication date

Source 5 - Subregional Drainage Basins for Clipping

Title: Connecticut Subregional Drainage Basins for Clipping

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Subregional Drainage Basins for Clipping originated from the Connecticut Subregional Drainage Basins Polygon feature class (SUBREGIONAL_BASIN_POLY)

Date: 2005

Currentness reference:

publication date

Source 6 - Connecticut Town Poly

Title: Connecticut Town Polygon

Originators: State of Connecticut, Department of Environmental Protection (data collector, editor and publisher)

U.S. Geological Survey, National Mapping Program (data compiler)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 19940101

Edition: 2005

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The USGS is the collector of the data (compiler). The State of Connecticut, Department of Environmental Protection is the creator and maintainer of the data layer (editor) and producer (publisher) of this information for use. The 2005 Edition essentially includes the same set of geographic features published in 1994. However, the 2005 Edition differs from information published in 1994 primarily as a result of minor corrections and improvements to feature geometry and feature attribute information. Some feature attribute information (data fields) have been slightly modified and made easier to use. This layer includes information that is relatively static and does not change over time. Data is not updated. Data compiled at 1:24,000 scale.

Map scale denominator: 24000

Media: disk

Source contribution:

A polygon feature-based layer that defines the geographic areas for the State of Connecticut and its counties and towns (municipalities) as depicted on the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps for the State of Connecticut. This layer only includes information for Connecticut. Connecticut_Town_Poly is in Geodatabase Feature Class format.

Date: 1969 Time: 1984

Currentness reference:

Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.

Source 7 - Subregional Dranage Basin Town Intersect

Title: Connecticut Subregional Drainage Basin Town Intersect

Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)

Publisher: State of Connecticut

Publication place: Hartford, Connecticut, USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disk

Date: 1988

Currentness reference:

publication date

Process Steps

Information about events, parameters, tolerances and techniques applied to construct or derive the data.

Process step information

Process Step 1

Process description:

Feature digitizing and attribution (digitizing tablet method) - Using ESRI ArcInfo software, basin boundary line features were digitized by registering the individual compilation sheets to the digitizing tablet and using the crosshairs of the digitizer's mouse to manually capture the geometry (location) of features drafted on the map. The corners of the USGS 7.5 minute topographic quadrangle maps are used as registration points and are depicted on the source map. The source map was registered to the digitizing tablet by digitizing (entering) the locations of four quadrangle corner registration points shown on the map. ArcInfo software compared the values of the digitized coordinates with the actual (true) values for the quadrangle corner (tic) features. The Root Mean Square (RMS) error generated by the ArcInfo software indicated the amount of error involved in transforming coordinates from the registered map to the digital layer. RMS errors higher than 0.004 were not acceptable and required re-registering the source map by digitizing the tic locations again. With a correct registration, basins boundaries features were manually digitized off the source map. Where necessary, additional minor corrections (edits) to feature geometry were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:24,000. Feature location and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to attribute value on the computer screen and on hard copy paper maps, and comparing this information to the orginal source data. These check plot maps were printed at the same scale as the source maps in order to visually inspect digitizing quality and the assignment of attribute values.

Individual quadrangle level basin boundary coverages were appended and edgematched along quadrangle boundaries to create a statewide layer in ArcInfo Coverage format having both polygon and line features. Polygon label points were created and assigned BASIN_NO values that uniquely identified each polygon feature. Most other related polygon and line feature attributes were assigned through automated procedures based on the format and hierarchical nature of the BASIN_NO value. Four additional fields (MBAS_NO, RBAS_NO, SBAS_NO, LBAS_NO) were added and populated based on the first, first 2, first 4, and first 7 columns of the BASIN_NO attribute. The MAJOR, REGIONAL, and SUBREGION attributes store drainage basin names based on MBAS_NO, RBAS_NO, SBAS_NO values, respectively. Basin names were attributed by joining basin name lookup tables to the polygon features base on MBAS_NO, RBAS_NO, SBAS_NO key values and populating the corresponding fields. These basin names are from the Natural Drainage Basins in Connecticut map, McElroy, 1981. The AREA_SQMI (area in square miles) and ACREAGE (area in acres) field were automatically calculated for each polygon feature based on computer generated feature area in square feet. The GAZRECNO attribute was manually assigned to each basin polygon feature.

For line features, the DBARC_COD attribute was populated through a combination of automated and manual processes that compared the BASIN_NO attribute value of the polygon on each side of the line. For example, if the two polygons are in different major basins (MBAS_NO on the left <> MBAS_NO on the right), then the line feature represents a Major basin drainage divide and is assigned a DBARC_COD value of 1. If the left and right polygons are in the same Major basins but in different regional basins (RBAS_NO on the left <> RBAS_NO on the right), the line feature is a Regional basin drainage divide and is assigned a DBARC_COD value of 2, and so on. DIVIDE is the English language equivalent of (decodes) the DBARC_COD attribute value and was populated by joining a lookup table to the line features instead of manually attributing these values for each line feature. AV_LEGEND and IMS_LEGEND values were also attributed through table joins.

Organization: State of Connecticut, Department of Environmental Protection

Person: Tom Nosal

Phone: 806-424-3540

Fax: 860-424-4058

Hours of service: Mondy to Friday, 8:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106

Country: USA

Process date: 1988

Process software and version: ArcInfo 5, 6

Data Source used

Source 1 - Source Materials

Title: drainage basin compilation sheets

Originators: State of Connecticut, Department of Environmental Protection

Publication date: Unpublished Material

Data type: stable base mylar

Map scale denominator: 24000

Media: stable-base material

Source contribution:

Basins compiled on 1:24,000-scale 7.5 minute USGS quadrangle area mylar overlays.

Data Source produced

Source 2 - Drainage Basins

Title: Connecticut Drainage Basins

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled and digitized from the 1:24,000-scale compilation sheets for the 1:125,000-scale Natural Drainage Basins in Connecticut Map, McElroy, 1981. The 2006 Edition includes the same basin features originally published in 1988 with some minor corrections and improvements made to feature attribute information. Previously undetected errors have been corrected and are included in this 2006 edition. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Drainage Basins is in ArcInfo Coverage format having both polygon and line features. The name of the ArcInfo Coverage is BASIN.

Date: 1988

Currentness reference:

publication date

Process Step 2

Process description:

Create Subregional Drainage Basins -  Using ArcInfo Workstation software, removed the BASIN_NO and LBAS_NO polygon feature attributes, calculated the ACREAGE and AREA_SQMI polygon attributes to zero, and dissolved polygon features on the remaining SBAS_NO, RBAS_NO, MBAS_NO, SUBREGIONAL, REGIONAL, and MAJOR attribute values to create subregional drainage basin polygon features. Using the ArcInfo Dissolve command, this step merged the smaller basin polygons into the larger subregional basin polygon features. Line features were preserved as part of the dissolve process and were merged using the ArcInfo Unsplit command afterwards. The ACREAGE and AREA_SQMI attributes were recalculated based on the new feature geometry, and ArcInfo coveage topology was re-established with the Build command.

Organization: State of Connecticut, Department of Environmental Protection

Person: Tom Nosal, Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Hours of service: Mondy to Friday, 8:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106

Country: USA

Process date: 1988

Process software and version: ArcInfo 6

Data Source used

Source 2 - Drainage Basins

Title: Connecticut Drainage Basins

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled and digitized from the 1:24,000-scale compilation sheets for the 1:125,000-scale Natural Drainage Basins in Connecticut Map, McElroy, 1981. The 2006 Edition includes the same basin features originally published in 1988 with some minor corrections and improvements made to feature attribute information. Previously undetected errors have been corrected and are included in this 2006 edition. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Drainage Basins is in ArcInfo Coverage format having both polygon and line features. The name of the ArcInfo Coverage is BASIN.

Date: 1988

Currentness reference:

publication date

Data Source produced

Source 3 - Subregional Drainage Basins

Title: Connecticut Subregional Drainage Basins

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled and digitized from the 1:24,000-scale compilation sheets for the 1:125,000-scale Natural Drainage Basins in Connecticut Map, McElroy, 1981. The 2006 Edition includes the same basin features originally published in 1988 with some minor corrections and improvements made to feature attribute information. Previously undetected errors have been corrected and are included in this 2006 edition. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Subregional Drainage Basins is in ArcInfo Coverage format having both polygon and line features. The name of the ArcInfo Coverage is SBASIN. These polygon and line feature data were subsequently converted to geodatabase feature format and named SUBREGIONAL_BASIN_POLY and SUBREGIONAL_BASIN_LINE, respectively.

Date: 1988

Currentness reference:

publication date

Process Step 3

Process description:

Subregional Drainage Basin Polygon features along the Connecticut coastline were enlarged to extend beyond the Connecticut shoreline into Long Island Sound to the boundary between the State of Connectict and New York in Long Island Sound. This feature class is designed to be used as a Clip feature class to clip other point line and polygon features to the subregional drainage basin areas. This feature class differs from the Subregional Drainage Basin Polygon feature class in that features along the Connecticut coastline were enlarged to extend beyond the Connecticut shoreline to the boundary between the State of Connectict and New York in Long Island Sound. These modifications apply to the coastal subregional basins 2000, 5000, and 7000 where the basin boundary coresponding to the Connecticut shoreline was replaced with the CT-NY state boundary in Long Island Sounce. These basin areas were enlarged to ensure Clip input features located along and near both sides of the shoreline are included in the Clip output feature class and associated with a subregional coastal basin (e.g. 2000, 5000, or 7000). Input features that should be in these coastal basins may not be in the resulting Clip output feature class unless the Connecticut Subregional Drainage Basins for Clipping is used as the Clip feature class. Using the unmodified, original Connecticut Subregional Drainage Basin Polygon feature class as the Clip feature class may produce different results for basins 2000, 5000, and 7000. The data source for the CT-NY state boundary is the Connecticut State Poly feature class. Both data sources used - Subregional Drainage Basins and Connecticut State Poly - have a 1:24,000-scale source map scale.

Organization: State of Connecticut, Department of Environmental Protection

Person: Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Hours of service: Mondy to Friday, 8:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106

Country: USA

Process date: 2006

Process software and version: ArcGIS 9.2

Data Source used

Source 3 - Subregional Drainage Basins

Title: Connecticut Subregional Drainage Basins

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled and digitized from the 1:24,000-scale compilation sheets for the 1:125,000-scale Natural Drainage Basins in Connecticut Map, McElroy, 1981. The 2006 Edition includes the same basin features originally published in 1988 with some minor corrections and improvements made to feature attribute information. Previously undetected errors have been corrected and are included in this 2006 edition. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Subregional Drainage Basins is in ArcInfo Coverage format having both polygon and line features. The name of the ArcInfo Coverage is SBASIN. These polygon and line feature data were subsequently converted to geodatabase feature format and named SUBREGIONAL_BASIN_POLY and SUBREGIONAL_BASIN_LINE, respectively.

Date: 1988

Currentness reference:

publication date

Source 4 - Connecticut State Poly

Title: Connecticut State Polygon

Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 19940101

Edition: 2005

Data type: vector digital data

Data location: http://www.ct.gov/deep

Map scale denominator: 24000

Media: disc

Source contribution:

A polygon feature-based layer that depicts the geographic area for the State of Connecticut as one polygon feature. Connecticut State Poly is in Geodatabase Feature Class format.

Beginning date: 1969

Ending date: 1984

Currentness reference:

publication date

Data Source produced

Source 5 - Subregional Drainage Basins for Clipping

Title: Connecticut Subregional Drainage Basins for Clipping

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Subregional Drainage Basins for Clipping originated from the Connecticut Subregional Drainage Basins Polygon feature class (SUBREGIONAL_BASIN_POLY)

Date: 2005

Currentness reference:

publication date

Process Step 4

Process description:

Create Subregional Drainage Basin Town Intersect -  Using a copy of the Connecticut Town Poly feature class, deleted all polygon attributes with the exception of town number (TOWN_NO) and town name (TOWN). Applied the Intersect geoprocessing command to overlay the modified town feature class with Subregional Drainage Basins for Clipping to create Connecticut Subregional Basin Town Intersect feature class, which only included polygon features where the two input feature classes intersected and overlapped each other. The ACREAGE and AREA_SQMI attributes in Connecticut Subregional Basin Town Intersect were recalculated based on the new feature geometry. The total geographic area covered by all polygon features is 4,967.56 square miles.

Organization: State of Connecticut, Department of Enviromental Protection

Person: Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Email: dep.gisdata@po.sate.ct.us

Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106-5127

Country: USA

Process date: 2006

Process software and version: ArcGIS 9.2

Data Source used

Source 5 - Subregional Drainage Basins for Clipping

Title: Connecticut Subregional Drainage Basins for Clipping

Originators: State of Connecticut, Department of Environmental Protection

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut USA

Publication date: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disc

Source contribution:

Connecticut Subregional Drainage Basins for Clipping originated from the Connecticut Subregional Drainage Basins Polygon feature class (SUBREGIONAL_BASIN_POLY)

Date: 2005

Currentness reference:

publication date

Source 6 - Connecticut Town Poly

Title: Connecticut Town Polygon

Originators: State of Connecticut, Department of Environmental Protection (data collector, editor and publisher)

U.S. Geological Survey, National Mapping Program (data compiler)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 19940101

Edition: 2005

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The USGS is the collector of the data (compiler). The State of Connecticut, Department of Environmental Protection is the creator and maintainer of the data layer (editor) and producer (publisher) of this information for use. The 2005 Edition essentially includes the same set of geographic features published in 1994. However, the 2005 Edition differs from information published in 1994 primarily as a result of minor corrections and improvements to feature geometry and feature attribute information. Some feature attribute information (data fields) have been slightly modified and made easier to use. This layer includes information that is relatively static and does not change over time. Data is not updated. Data compiled at 1:24,000 scale.

Map scale denominator: 24000

Media: disk

Source contribution:

A polygon feature-based layer that defines the geographic areas for the State of Connecticut and its counties and towns (municipalities) as depicted on the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps for the State of Connecticut. This layer only includes information for Connecticut. Connecticut_Town_Poly is in Geodatabase Feature Class format.

Date: 1969 Time: 1984

Currentness reference:

Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.

Data Source produced

Source 7 - Subregional Dranage Basin Town Intersect

Title: Connecticut Subregional Drainage Basin Town Intersect

Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)

Publisher: State of Connecticut

Publication place: Hartford, Connecticut, USA

Publication date: 1988

Edition: 2006

Data type: vector digital data

Data location: http://www.ct.gov/deep

Other citation details:

The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. This data is not updated. Source map scale is 1:24,000.

Map scale denominator: 24000

Media: disk

Date: 1988

Currentness reference:

publication date

ESRI geoprocessing history

Description of ESRI geoprocessing commands, settings, and tolerances applied to the data.

ESRI geoprocessing command information

1 Process

Date: 20061207 Time: 102240

Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures

Command issued: CopyFeatures F:\GeoData\Basin\Subregional_Basin_Town_Intersect.shp "F:\GeoData\Basin\New Personal Geodatabase.mdb\Subregional_Basin_Town_Intersect" # 10000 0 0

2 Process

Date: 20061207 Time: 102457

Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures

Command issued: CopyFeatures "F:\GeoData\Basin\New Personal Geodatabase.mdb\Subregional_Basin_Town_Intersect" "Database Connections\depdbs11@dep.sde\depgis.DEP.Subregional_Basin_Town_Intersect" DEPVECTORSTATIC 10000 0 0

3 CopyFeatures_80

Date: 20081215 Time: 162931

Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures

Command issued: CopyFeatures "Database Connections\10.18.8.94.depgis@DEP.sde\depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT" "Database Connections\062174-svr.depgis@DEP.sde\depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT" DEPFEATURESTATIC 0 0 0

4 Process

Date: 20090915 Time: 145947

Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures

Command issued: CopyFeatures "Database Connections\10.18.8.60.depgis@DEP_dc.sde\depgis.DEP.SUBREGIONAL_BASIN_TOWN_INTERSCT" Y:\GIS_Warehouse\public_data\Geodatabase_format\Hydrography\Watershed.gdb\SUBREGIONAL_BASIN_TOWN_INTERSCT # 0 0 0