Description: The Arroyo Colorado Watershed was delineated using the Soil and Water Assessment Tool (SWAT) in ArcGIS. U.S. Geological Survey (USGS) Digital Elevation Models (DEMs), at 30 meter resolution, were used to determine subwatersheds for the Arroyo Colorado. Texas Commission on Environmental Quality (TCEQ) stream segments for the Arroyo Colorado were used to direct water flow. TCEQ Surface Water Quality Monitoring Stations were used as subwatershed output points . A threshold of 3,792 ha was used to determine subwatersheds. The outermost boundaries of all subwatersheds were used to define the watershed.
Description: This layer depicts the official TCEQ Segments at the segment level for the State of Texas as listed in Title 30, Chapter 307 of the Texas Administrative Code (TAC), also known as the Surface Water Quality Standards. These are streams and waterbodies that have been individually defined by the TCEQ and assigned unique identification numbers. Intended to have relatively homogeneous chemical, physical, and hydrological characteristics, a segment provides a basic unit for assigning site-specific standards and for applying water quality management programs of the agency. Both "classified" and "unclassified" segments have been included in this layer. Classified segments, also referred to as designated segments, refer to water bodies that are protected by site- specific criteria. The classified segments are listed and described in Appendix A and C of Chapter 307.10. The site-specific uses and criteria are described in Appendix A. Classified waters include most rivers and their major tributaries, major reservoirs, and estuaries. Unclassified waters are those smaller water bodies that do not have site-specific water quality standards assigned to them, but instead are protected by general standards that apply to all surface waters in the state. This layer also indentifies which segments and water bodies have been assessed in the DRAFT 2010 Texas Integrated Report for Clean Water Act Sections 305 (b) and 303 (d). An impaired segment is a water body included in Category 5. Water bodies in Category 5 do not meet applicable water quality standards or are threatened for one or more designated uses by one or more pollutants.
Copyright Text: Acknowledgement of the Texas Commission on Environmental Quality is appreciated on any products using this dataset.
Description: Farmland suitability was determined using SSURGO soils data with the NRCS Soil Data Viewer 6.0 to extract Farmland Classification. NRCS defines this as:
“Farmland classification identifies map units as prime farmland, farmland of statewide importance, farmland of local importance, or unique farmland. It identifies the location and extent of the soils that are best suited to food, feed, fiber, forage, and oilseed crops. NRCS policy and procedures on prime and unique farmlands are published in the "Federal Register," Vol. 43, No. 21, January 31, 1978.”
*Note: Harlingen clay was changed in Hidalgo County from its original classification to represent “Prime farmland if irrigated”.
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Description: Hydrologic Soil Groups were classified from SSURGO soils using the NRCS Soil Data Viewer 6.0. NRCS defines Hydrologic Soil Groups as:
“Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes.”
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Description: Abstract:
This data set consists of general soil association units. It was develped by the National Cooperative Soil Survey and supersedes the State Soil Geographic (STATSGO) data set published in 1994. It consists of a broad based inventory of soils and nonsoil areas that occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. The data set was created by generalizing more detailed soil survey maps. Where more detailed soil survey maps were not available, data on geology, topography, vegetation, and climate were assembled, together with Land Remote Sensing Satellite (LANDSAT) images. Soils of like areas were studied, and the probable classification and extent of the soils were determined.
Map unit composition was determined by transecting or sampling areas on the more detailed maps and expanding the data statistically to characterize the whole map unit.
This data set consists of georeferenced vector digital data and tabular digital data. The map data were collected in 1-by 2-degree topographic quadrangle units and merged into a seamless national data set. It is distributed in state/territory and national extents. The soil map units are linked to attributes in the National Soil Information System data base which gives the proportionate extent of the component soils and their properties.
Purpose:
These data provide information about soil features on or near the surface of the Earth. Data were collected as part of the National Cooperative Soil Survey. These data are intended for geographic display and analysis at the state, regional, and national level. The data should be displayed and analyzed at scales appropriate for 1:250,000-scale data.
Description: This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. A special soil features layer (point and line features) is optional. This layer displays the location of features too small to delineate at the mapping scale, but they are large enough and contrasting enough to significantly influence use and management. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.
Description: Percent developed land was calculated for each subwatershed based on National Agricultural Statistics Service land cover data for 2011. Total area of “Developed/Open Space”, “Developed/Low Intensity”, “Developed/Med Intensity”, and “Developed/High Intensity” classifications were used to derive percentages.
Description: Percent cropland was calculated for each subwatershed based on National Agricultural Statistics Service land cover data for 2011. Various classifications, including Alfalfa, Cabbage, Citrus, Corn, Cotton, Fallow/Idle Cropland, Herbs, Oats, Oranges, Other Crops, Peanuts, Peas, Pecans, Rice, Sorghum, Soybeans, Spring Wheat, Sugarcane, Sunflower, and Winter Wheat, were used to derive percentages.
Description: This dataset is a complete digital hydrologic unit boundary layer to the sub-watershed (12-digit) 6th level at 1:24,000 scale. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 3/01/02 (http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/index.html ). The hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas.
Polygons are attributed with hydrologic unit codes, names, downstream hydrologic unit, flow modifications, and hydrologic unit type for 4th level (8-digit) sub-basin, 5th level (10-digit) watershed, 6th level (12-digit) subwatershed, and acres for subwatershed. An accompanying line shapefile is attributed with the highest hydrologic unit level for each hydrologic unit, linesource, and a metadata reference file.
A text document that is provided with the data called Watershed Boundary Dataset (WBD) User Guide provides information on the methodology used to delineate the hydrologic units and provides definition for all the attributes. The smaller sized 6th level (12 digit) sub-watersheds (most within 10,000 to 40,000 acres) are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. This data set is intended to be used as a tool for water-resource management and planning activities, particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information.
For additional information on Watershed Boundary Dataset (WBD) see the following: http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/index.html
Description: Abstract: This layer contains the point locations of Water Rights Diversions for surface water in Texas. Level 3 Certification - This layer does not meet the minimum 25 meter agency standard. The layer was certified with known problems that have been documented in the metadata. It is not suitable for high-precision measurement applications.
Purpose: General purpose use. To determine locations of Surface Water Rights Diversion Points in Texas. This GIS layer will provide the foundation for future application developments designed to provide a means for TCEQ staff to spatially query Water Rights databases.
Supplemental_Information: This layer is currently certified as a Level Three Layer, which means it is not in its final form. Once duplicate or incorrect identification numbers are corrected by the Surface Water Uses Section of the TCEQ, a data table (WRDETAIL) will be joined to the coverage to allow for spatial queries of the database, and to provide supplemental information for each point in the coverage. Approximately 177 points have duplicate id numbers, and 18 points appear to lie in river basins that do not match their id numbers. For information on Surface Water Rights in Texas, refer to: http://www.tceq.state.tx.us/nav/util_water/water_rights.html
Description: This layer contains active and historical TCEQ Surface Water Quality Monitoring Stations for the entire state of Texas. The locations for this layer were obtained from TCEQ surface water quality monitoring programs and from other entities including but not limited to: Texas Commission on Environmental Quality (TCEQ), or predecessor agencies Engineering/Environmental firms U.S. Geological Survey (USGS) Texas Department of Health (TDH) Councils of Governments Local Governments River Authorities and Utility Districts Texas Parks and Wildlife Department (TPWD) Railroad Commission of Texas (RRC) U.S. Army Corps of Engineers (USACE) Texas Institute of Applied Environmental Research (TIAER) University of Texas Marine Science Institute (UTMSI) Texas A & M University Corpus Christi Center for Coastal Studies (TAMUCC CCS) Underground Water Conservation Districts International Boundary and Water Commission (IBWC) This layer was built using the best existing location data available from these sources. All location data has been reviewed by the custodian, but some errors may still remain. If data users identify errors, they are encouraged to provide details to the custodian to facilitate correction.
Description: This layer contains locations and associated database information for permitted municipal & industrial wastewater quality outfalls. An outfall is defined as any point source discharge from a domestic or industrial facility. Some of the outfalls in this layer also represent stormwater discharge points.
Description: The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.
*Note: Only features classified as "Stream/River: Hydrographic Category = Intermittent", or "Stream/River: Hydrographic Category = Perennial" are displayed.
Description: The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.
*Note: Only features classified as "Artificial Path" are displayed.
Description: The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.
*Note: Only features classified as "Canal/Ditch", or "Canal/Ditch: Canal/Ditch Type = Aqueduct" are displayed.
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Description: Market value calculations were made using the 1997 County Appraisal District data from the State Comptroller’s Office. Market value per acre is displayed at the ISD level.
Description: Market value calculations were made using the 2002 County Appraisal District data from the State Comptroller’s Office. Market value per acre is displayed at the ISD level.
Description: Market value calculations were made using the 2007 County Appraisal District data from the State Comptroller’s Office. Market value per acre is displayed at the ISD level.
Description: Market value change calculations were made using the 1997 and 2007 County Appraisal District data from the State Comptroller’s Office. Change in market value per acre is displayed at the ISD level.
Description: Population change was determined by subtracting the 2000 Census total population count by Census Block from the 2010 Census total population count by Census Block. For blocks with boundaries intersected by a subwatershed boundary, or extending beyond the Arroyo Colorado watershed boundary, the proportion of area contained within the subwatershed for a particular block was assumed to be equivalent to the proportion of total population contained within the subwatershed. Each subwatershed was assigned a total population based on the sum of populations for each block contained in its boundary.
Description: Population density was determined for each Arroyo Colorado subwatershed using total population by Census Block from the 2000 Census. Density is calculated as the number of people per acre. For blocks intersected by a subwatershed boundary, the proportion of area contained within the subwatershed for a particular block was assumed to be equivalent to the proportion of total population contained within the subwatershed. Each subwatershed was assigned a total population based on the sum of populations for each block contained in its boundary.
Description: Population density was determined for each Arroyo Colorado subwatershed using total population by census block from the 2010 Census. Density is calculated as the number of people per acre. For blocks intersected by a subwatershed boundary, the proportion of area contained within the subwatershed for a particular block was assumed to be equivalent to the proportion of total population contained within the subwatershed. Each subwatershed was assigned a total population based on the sum of populations for each block contained in its boundary.
Description: Population density change was determined by subtracting the 2000 Census population density from the 2010 Census population density. Density is calculated as the number of people per acre. For blocks intersected by a subwatershed boundary, the proportion of area contained within the subwatershed for a particular block was assumed to be equivalent to the proportion of total population contained within the subwatershed. Each subwatershed was assigned a total population based on the sum of populations for each block contained in its boundary.