Metadata
also available within shapefile downloaded from LIMA.
Identification_Information:
Citation:
Louisiana Department of Environmental Quality (LDEQ). 2021.
Subsegment Boundaries (VECTOR.la_ldeq_subsegments) [vector polygon geospatial
data]. Last updated November 7, 2022. Office of Environmental Assessment, Water
Planning and Assessment Division, Water Quality Standards and Assessment
Section. Baton Rouge, Louisiana
Citation_Information:
Title: VECTOR.la_ldeq_subsegments
Geospatial_Data_Presentation_Form: vector digital data
Description:
This is a polygon data set of watershed basin subsegments
for Louisiana. The dataset was developed for the LDEQ Office of Environmental
Assessment's (OEA) watershed assessment and management tasks. The
basin-subsegments form the management units for water resources used throughout
the agency. This layer was approved in 2021 and reflects updates from water
quality rules including: WQ097 (Triennial Review updates that include a
subsegment addition, several boundary refinements, subsegment merges, and also
name edits, code edits, and description edits); WQ106 (description updates to
Cross Bayou and Cross Lake); and WQ108 (reverted Intracoastal Waterway and
Mississippi River Gulf Outlet to original descriptions). This dataset contains
497 individual subsegments and six main fields. The main fields include:
SUBSEGMENT; SUBSEGMENT_ID; NAME; DESCRIPTION; BASIN; and MASTER_AI_ID.
Abstract:
This basin-subsegment data is used for water quality
planning and regulatory tasks, and form the water quality management units used
throughout the Louisiana Department of Environmental Quality (LDEQ). This
dataset is for use in the LDEQ Interactive Make-A-Map Application (LIMA). The
dataset was developed for the LDEQ Office of Environmental Assessment's (OEA)
watershed assessment and management tasks. The basin-subsegments form the
management units for water resources used throughout the agency. This dataset
was last updated August 2021, with minor metadata updates in November 2022.
Purpose:
This basin-subsegment data is used for water quality
planning and regulatory tasks, and form the water quality management units used
throughout LDEQ (LDEQ, 2021, Water Quality Management Plan: Vol. 4, App. A).
This dataset is also for use in the Louisiana Department of Environmental
Quality Make-A-Map Application (LIMA).
Other:
This section includes details relevant to this layer’s
updates.
Subsegment Code Updates (WQ097):
·
LA020303_001
became LA020305_00 (Luling Wetland); LA030103_04075 became LA030105_00 (Kinder
Ditch); LA030806_554700 became LA030808_00 (Houston River Canal); LA040604_001
became LA040607_00 (South Slough Wetland); LA060801_001 became LA060807_00
(Cote Gelee Wetland); LA081601_556716 became LA081612_00 (Georgetown
Reservoir); and LA090202_5126 became LA090209_00 (Morgan River).
Name Updates (WQ097):
·
LA040502_00
changed from Blood River to Tickfaw River; LA040506_00 changed from Tickfaw
River to Blood River; LA040802_00 changed from Ponchitolawa Creek to Tchefuncte
River; LA040807_00 changed from Tchefuncte River to Ponchitolawa Creek; and
LA090205_00 changed from Wilson Slough to Wilson and Bradley Slough.
Subsegment Additions (WQ097):
·
Old
Saline Bayou (LA101507_00).
Subsegment Merges (WQ097):
·
LA090206_00
(Bradley Slough) absorbed into LA090205_00 (Wilson Slough and Bradley Slough);
LA090207_5112 (Morgan Bayou) absorbed into LA090207_00 (Middle Pearl River and
West Middle Pearl River); southern portion of LA100901_00 (Nantaches Creek)
absorbed into LA100902_00 (Nantaches Lake); and LA100903_00 (Bayou Nantaches)
absorbed into LA100902_00 (Nantaches Lake).
Description Updates (WQ097 & WQ106):
·
WQ097:
Atchafalaya River (LA010801_00); Wax Lake Outlet (LA010802_00); Bayou Des
Allemands (LA020201_00); Luling Wetland (LA020305_00); Barataria Waterway
(LA020903_00); Kinder Ditch (LA030105_00); Calcasieu River (LA030401_00); Bayou
Serpent (LA030701_00); Houston River Canal (LA030808_00); Intracoastal Waterway
(LA031101_00); Colyell Bay (LA040305_00); Blind River (LA040401_00); South
Slough (LA040604_00); South Slough Wetland (LA040607_00); Chappepeela Creek
(LA040704_00); Lake Pontchartrain (LA041001_00); Lake Arthur and Lower
Mermentau River to ICWW (LA050402_00); Lacassine Bayou (LA050601_00); Big
Constance Lake (LA050802_00); Cote Gelee Wetland (LA060807_00); Bayou Carron
(LA06210_00); Chatlin Lake Canal and Bayou DuLac (LA060212_00); Tete Bayou
(LA060701_00); Bayou Du Portage (LA060703_00); Bayou Carlin (LA060902_00);
Bayou Bartholomew (LA080401_00); Bayou Lafourche (LA080904_00); Tensas River
(LA081201_00); Little River (LA081301_00); Little River (LA081601_00); Wilson
Slough and Bradley Slough (LA090205_00); Morgan River (LA090209_00); Little
Silver Creek (LA090503_00); Kepler Creek (LA100704_00); Kepler Creek
(LA100706_00); Bayou Choctaw (LA120103_00); Bayou Grosse Tete (LA120104_00);
Bayou Chauvin (LA120507_00); Bayou Blue (LA120604_00); Houma Navigation Canal
(LA120705_00). WQ106: Cross Bayou (LA100309_00) and Cross Lake (LA100310_00).
Boundary Refinements (WQ097):
·
LA010502_00
(Intracoastal Waterway) to better follow levee (affected neighboring subsegment
LA120201_00); LA020403_00 (Bayou Lafourche) to better follow levee (affected
neighboring subsegments 020905, 020906, and 120706); LA030103_00 (Calcasieu
River) to include flowline near Marsh Bayou cutoff (affected LA030603_00);
LA030806_00 (Houston River) to better follow flowline near Sam Houston State
Park (affected LA030801_00); LA040301_00 (Amite River) to more accurately
follow LA-37 (affected LA040302_00); LA040307_00 (West Colyell Creek) to more
accurately follow Hood Road (affected LA040305_00); LA040501_00 (Tickfaw River)
to more accurately follow LA-42 (affected LA040502_00); LA040804_00 (Bogue
Falaya River) to better follow levee and confluence area (affected LA040802_00
and LA040808_00); LA040912_00 (Bayou LaCombe) to make southern boundary more
accurately follow US-190 (affected LA040913_00); LA060806_00 (Cypress Island
Coulee Wetland) to remove erroneous western protrusion (affected LA060801_00);
LA080607_00 (Corney Bayou) to capture Sugar Creek drainage (affected
LA080608_00); LA090102_00 (East Pearl River) to incorporate erroneous
disconnected polygon (affected LA090107_00); LA090204_00 (Pearl River
Navigation Canal) to extend to West Pearl (affected LA090201_00 and
LA090204_00); LA100101_00 (Red River) to more accurately follow river (affected
LA060209_00, LA100606_00, LA101101_00, and LA101301_00); LA100201_00 (Red
River) adjusted near new control structure (affected LA010101_00); LA100701_00
(Black Lake Bayou) adjusted near Leatherman Creek area (affected LA100702_00);
LA100707_00 (Castor Creek) to remove northern appendage (affected LA100705_00);
LA100803_00 (Saline Bayou) expanded (affected LA100101_00, LA100703_00, and
LA100802_00); LA101302_00 (Iatt Lake) to incorporate all of Iatt Pool area
(affected LA101303_00); LA120705_00 (Houma Navigation Canal) to end at Bayou
Petite Caillou (affected LA120702_00).
Cleanup Rule (WQ108):
·
Reverted
the proposed description edits from WQ097 of the Intracoastal Waterway
(LA031002_00) and Mississippi River Gulf Outlet (MRGO) (LA041901_00) to their
original descriptions.
Water quality rules relevant to this layer's subsegments:
·
WQ097:
Watery Quality Standards Triennial Revision (LAC 33: IX.Chapter
11). The Triennial Revision updates include a subsegment addition, several
boundary refinements, subsegment merges, and also name updates, code updates,
and description edits.
·
WQ106:
Cross Lake and Cross Bayou Stream Descriptions (LAC 33:IX.1123).
Cross Bayou (LA100309_00) and Cross Lake (LA100310_00) description updates.
·
WQ108:
Post-WQ097 Cleanup Rule (LAC 33:IX.1123.Table 3).
Removed proposed description edits from WQ097 of two subsegments, the
Intracoastal Waterway (LA031002_00) and Mississippi River Gulf Outlet (MRGO)
(LA041901_00), and reverted to their original descriptions.
Historical Environmental Regulations relevant to this layer:
·
Louisiana
Administrative Code. (December 3, 2021). 2021 Edition. Title 33, Part IX (Water
Quality), Chapter 11, Surface Water Quality Standards, Table 3. [EDMS Document
ID 13070383] Available at https://edms.deq.louisiana.gov/app/doc/view?doc=13070383.
EDMS Document IDs for reference:
·
By
WQ Rule Package: 11971632 (strike through version) (Notice of Intent; WQ097);
12458810 (Final Rule; WQ097); 12388758 (Final Rule; WQ106); 12833455 (WQ108 Final
Rule).
·
Historical
Regulations: 13070383 (Part IX Water Quality Regulations 2021).
·
Access
LDEQ EDMS at https://www.deq.louisiana.gov/page/edms.
Notes:
·
For
LA040502_00, the name changed from "Blood River-From headwaters to George
White Road" back to "Tickfaw River-From La. Highway 42 to Lake
Maurepas" for the WQ097 update, though LA040502_00 was Blood River from
approximately 2016 to 2020.
·
For
LA040506_00, the name changed from "Tickfaw River-From La. Highway 42 to
Lake Maurepas" back to "Blood River-From headwaters to George White
Road" for the WQ097 update, though LA040506_00 was Tickfaw River from
approx. 2016 to 2020.
·
For
LA040802_00, the name changed from " Ponchitolawa Creek-From headwaters to
US Highway 190 (Scenic)" to "Tchefuncte River-From US Highway 190 to
Bogue Falaya River; includes tributaries (Scenic)." Also, note that
LA040802_00 was Ponchitolawa Creek from approximately 2016 to 2020, though
prior to 2016, LA040802_00 was "Tchefuncte River from Bogue Falaya to
LA-22 (Scenic)".
·
For
LA040807_00, the name changed from "Tchefuncte River-From US Highway 190
to Bogue Falaya River; includes tributaries (Scenic)" to
"Ponchitolawa Creek-From headwaters to US Highway 190." Also, note
that LA040807_00 was Tchefuncte River from approximately 2016 to 2020.
·
Subsegment
LA090205_00 (Wilson Slough) absorbed LA090206_00 (Bradley Slough) and is
renamed "Wilson Slough and Bradley Slough."
·
Subsegment
LA090207_00 (Middle Pearl River and West Middle Pearl River) absorbed
LA090207_5112 (Morgan Bayou); name did not require edits.
·
LA100902_00
(Nantaches Lake) absorbed subsegment LA100903_00 (Bayou Nantaches) and southern
portion of LA100901_00 (Nantaches Creek); name did not require edits.
·
LA101507_00
(Old Saline Bayou) was created by clipping western drainage off of LA101505 _00
(Larto Lake).
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -94.054550
East_Bounding_Coordinate: -88.619144
North_Bounding_Coordinate: 33.023559
South_Bounding_Coordinate: 28.836131
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: subsegment
Theme_Keyword: watershed
Theme_Keyword: drainage
Theme_Keyword: water quality
Theme_Keyword: basin-subsegment
Theme_Keyword: water
Theme_Keyword: water resources
Theme_Keyword: pollution
Theme_Keyword: basin
Theme_Keyword: environment
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: environment
Access_Constraints: None
Use_Constraints:
The data herein, including but not limited to geographic
data, tabular data, analytical data, electronic data structures or files, are
provided "as is" without warranty of any kind, either expressed or
implied, or statutory, including, but not limited to, the implied warranties or
merchantability and fitness for a particular purpose. The entire risk as to the
quality and performance of the data is assumed by the user. No guarantee of
accuracy is granted, nor is any responsibility for reliance thereon assumed. In
no event shall the State of Louisiana or the Louisiana Department of
Environmental Quality (LDEQ) be liable for direct, indirect, incidental,
consequential or special damages of any kind, including, but not limited to,
loss of anticipated profits or benefits arising out of use of or reliance on
the data. The State of Louisiana and the LDEQ do not accept liability for any
damages or misrepresentation caused by inaccuracies in the data or as a result
of changes to the data caused by system transfers or other transformations or
conversions, nor is there responsibility assumed to maintain the data in any
manner or form. These data have been developed from the best available sources.
Although efforts have been made to ensure that the data are accurate and
reliable, errors and variable conditions originating from physical sources used
to develop the data may be reflected in the data supplied. Users must be aware
of these conditions and bear responsibility for the appropriate use of the
information with respect to possible errors, scale, resolution, rectification,
positional accuracy, development methodology, time period, environmental and
climatic conditions and other circumstances specific to these data. The user is
responsible for understanding the accuracy limitations of the data provided
herein. The burden for determining fitness for use lies entirely with the user.
The user should refer to the accompanying metadata notes for a description of
the data and data development procedures. Although these data have been
processed successfully on computers at the LDEQ, no guarantee, expressed or
implied, is made by the State of Louisiana or the LDEQ regarding the use of
these data on any other system, nor does the act of distribution constitute or
imply any such warranty. Distribution of these data is intended for information
purposes and should not be considered authoritative for navigational,
engineering, legal and other site-specific uses.
Data_Set_Credit: Louisiana Department of Environmental Quality (LDEQ), Office of Environmental Assessment (OEA), Water Planning and Assessment Division (WPAD), Water Quality Standards and Assessment Section (WQSAS). Editors to geospatial data: WPAD, WQSAS staff.
Native_Data_Set_Environment:
Microsoft Windows 10 Enterprise; Esri ArcGIS 10.7.1.11595
Data_Quality_Information:
The horizontal accuracy of this dataset complies with National Map Accuracy Standards which requires that the positions of 90 percent of all points tested must be accurate within 1/50th of an inch (0.05 centimeters) on the map. At 1:24,000 scale, 1/50th of an inch is 40 feet (12.2 meters). There is no vertical component to this dataset.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 497
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 UTM Zone 15N
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -93.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.00012800000011920932
Ordinate_Resolution: 0.00012800000011920932
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: VECTOR.la_ldeq_subsegments
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically
generated.
Attribute:
Attribute_Label: SUBSEGMENT
Attribute_Definition: Text field containing a numeric subsegment
code.
Attribute_Definition_Source: [from Environmental
Regulations, AI # 181731] Louisiana Administrative Code. (December 3, 2021).
Title 33, Part IX (Water Quality), Chapter 11, Surface Water Quality Standards,
Table 3. [EDMS Document ID 13070383] Available at https://edms.deq.louisiana.gov/app/doc/view?doc=13070383. Accessed July 2021.
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique character field containing a numeric code found in
Table 3 of LAC.33.IX.11., dated
12/3/2021, from the Environmental Regulation Publications.
Attribute:
Attribute_Label: SUBSEGMENT_ID
Attribute_Definition: Text field containing an alphanumeric subsegment code. The
main subsegment code is preceded by "LA" and ends with
"_00." The label may be truncated to SUBSEGME_1 when converted to a
shapefile.
Attribute_Definition_Source: Water Quality Management
Plan: Volume 4 Basin and Subsegment Boundaries; Appendix A: Subsegment Descriptions
by Basin. (3/9/2021). EDMS Document ID 12606482. Office of Environmental
Assessment; Water Planning and Assessment Division. Baton Rouge, Louisiana.
Available at https://edms.deq.louisiana.gov/app/doc/view?doc=12606482
.
Attribute_Domain_Values:
Unrepresentable_Domain: Unique character field containing an alphanumeric code
found in the LDEQ Water Quality Management Plan, Volume 4, App. A.
Attribute:
Attribute_Label: NAME
Attribute_Definition: Text field containing the name of the water body within the
subsegment.
Attribute_Definition_Source: LDEQ. March 9, 2021. Water
Quality Management Plan: Volume 4 Basin and Subsegment Boundaries; Appendix A:
Subsegment Descriptions by Basin. (3/9/2021). EDMS Document ID 12606482. Office
of Environmental Assessment; Water Planning and Assessment Division. Baton
Rouge, Louisiana. Available at https://edms.deq.louisiana.gov/app/doc/view?doc=12606482.
Attribute_Domain_Values:
Unrepresentable_Domain: Name of the water body found in the LDEQ Water Quality Management Plan, Volume 4, App. A (3/9/2021).
Attribute:
Attribute_Label: DESCRIPTION
Attribute_Definition: Text field containing additional information about the
water body within the subsegment, such as the water body's extent, secondary
name(s), or estuarine and scenic designations, if applicable; otherwise, the
NAME field contents are repeated. The label may be truncated to DESCRIPTIO when
converted to a shapefile.
Attribute_Definition_Source: LDEQ. March 9, 2021. Water
Quality Management Plan: Volume 4 Basin and Subsegment Boundaries; Appendix A:
Subsegment Descriptions by Basin. (3/9/2021). EDMS Document ID 12606482. Office
of Environmental Assessment; Water Planning and Assessment Division. Baton
Rouge, Louisiana. Available at https://edms.deq.louisiana.gov/app/doc/view?doc=12606482.
Attribute_Domain_Values:
Unrepresentable_Domain: Text describing additional details of the water body within the subsegment found in the LDEQ Water Quality Management Plan, Volume 4, App. A (3/9/2021).
Attribute:
Attribute_Label: BASIN
Attribute_Definition: Text field containing the LDEQ water
quality management basin that the subsegment resides. There are twelve total
major river basins.
Attribute_Definition_Source: LDEQ. Water Quality
Management Plan: Volume 4 Basin and Subsegment Boundaries. Office of
Environmental Assessment; Water Planning and Assessment Division. Baton Rouge,
Louisiana.
Attribute_Domain_Values: ATCHAFALAYA; BARATARIA; CALCASIEU; MERMENTAU; MISSISSIPPI;
OUACHITA; PEARL; PONTCHARTRAIN; RED; SABINE; TERREBONNE; VERMILION-TECHE.
Enumerated_Domain:
Definitions:
ATCHAFALAYA: Atchafalaya River Basin (basin number 01)
BARATARIA: Barataria Basin
(basin number 02)
CALCASIEU: Calcasieu River
Basin (basin number 03)
MERMENTAU: Mermentau River
Basin (basin number 05)
MISSISSIPPI: Mississippi
River Basin (basin number 07)
OUACHITA: Ouachita River
Basin (basin number 08)
PEARL: Pearl River Basin
(basin number 09)
PONTCHARTRAIN: Lake
Pontchartrain Basin (basin number 04)
RED: Red River Basin (basin
number 10)
SABINE: Sabine River Basin
(basin number 11)
TERREBONNE: Terrebonne Basin
(basin number 12)
VERMILION-TECHE: Vermilion-Teche River Basin (basin number
06)
Attribute:
Attribute_Label: MASTER_AI_ID
Attribute_Definition: Numeric field containing a subsegment's
unique identifier assigned by LDEQ, known as the Agency Interest (AI) number. May be truncated to
MASTER_AI_ when converted to a shapefile.
Attribute_Definition_Source: LDEQ
Attribute_Domain_Values:
Unrepresentable_Domain: Unique numerical identifier assigned by LDEQ.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values: polygon
Attribute:
Attribute_Label: SHAPE.AREA
Attribute:
Attribute_Label: SHAPE.LENG
Distribution_Information:
Distributed by:
Louisiana
Department of Environmental Quality, Office of Environmental Assessment, Water
Planning and Assessment Division, Water Quality Standards and Assessment
Section. This dataset (layer name: LDEQ Subsegments, under Hydrology group) may
be downloaded as a shapefile from the Louisiana Department of Environmental
Quality Interactive Make-A-Map Application (LIMA). LIMA is accessed through the
LDEQ public website with search term “LIMA,” and may also be found in the
Resources section. LIMA can be located by browser with search terms such as “LDEQ,
LIMA, make a map.”
Distribution contact:
Amanda Vincent
(WQSAS, LDEQ), email: Amanda.Vinent@LA.GOV; and Water Quality Standards and Assessment Section, email: _DEQ-WWWWaterQuality@MAIL.LA.GOV.
Metadata_Reference_Information:
Metadata_Date: 20210816
Metadata_Standard_Name: FGDC Content Standard for
Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Generated
by mp
version 2.9.12 on Mon Dec 21 12:48:57 2015 – Last updated on 11/07/2022.