Name: Wildfire Ready Watersheds Average Susceptibility of Values at Risk to Hazards (CWCB)
Display Field: Name
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal extent of surface water drainage to a point except in coastal or lake front areas where there could be multiple outlets as stated by the "Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)" “Standard” (http://pubs.usgs.gov/tm/11/a3/). Watershed boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. This dataset represents the hydrologic unit boundaries to the 12-digit (6th level) for the entire United States. Some areas may also include additional subdivisions representing the 14- and 16-digit hydrologic unit (HU). At a minimum, the HUs are delineated at 1:24,000-scale in the conterminous United States, 1:25,000-scale in Hawaii, Pacific basin and the Caribbean, and 1:63,360-scale in Alaska, meeting the National Map Accuracy Standards (NMAS). Higher resolution boundaries are being developed where partners and data exist and will be incorporated back into the WBD. WBD data are delivered as a dataset of polygons and corresponding lines that define the boundary of the polygon. WBD polygon attributes include hydrologic unit codes (HUC), size (in the form of acres and square kilometers), name, downstream hydrologic unit code, type of watershed, non-contributing areas, and flow modifications. The HUC describes where the unit is in the country and the level of the unit. WBD line attributes contain the highest level of hydrologic unit for each boundary, line source information and flow modifications.
Copyright Text: Funding for the Watershed Boundary Dataset (WBD) was provided by the USDA-NRCS, USGS and EPA along with other federal, state and local agenciesies. Representatives from many agencies contributed a substantial amount of time and salary towards quality review and updating of the dataset in order to meet the WBD Standards. Acknowledgment of the originating agencies would be appreciated in products derived from these data. See dataset specific metadata for further information
Name: Alluvial Aquifer Extent and Vulnerability (CDPHE)
Display Field: NAME
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: The Colorado Department of Public Health and Environment (CDPHE) Tracking program collaborated with the Water Quality Control Division (WQCD), OPS and the Colorado Geologic Survey (CGS) to create an atlas of groundwater vulnerability. The Groundwater Vulnerability Tool is comprised of datasets representing potential impacts related to groundwater quality.Estimated groundwater aquifer vulnerability. Based on SWAP program GW_PhysicalSetting_scores. These points were jittered using a random direction and approximately 0.5 mile offset. Jittered points were then run through IDW with a cell size of 6436 meters (~4 miles) and a variable search using 12 points or 6436 meters. IDW output raster was processed using the Math>Int tool to create integer values from random float type. Calculate gridcodes based on weighted scores from oringinal dataset. Some accuracy in vulnerabilty was lost here in rounding. Using the Int output the raster could be transformed to a polygon. The output GW_PhysicalSetting vulnerability IDW output polygon was clipped to the boundaries of the bedrock aquifers. Finally, the clipped IDW output was spatially joined to the original bedrock aquifer file in order to get aquifer designations and ancillary bedrock aquifer info.
Copyright Text: Groundwater Vulnerability Tool built by:
Eric Brown
Colorado Department of Public Health and Environment
Center for Health and Environmental Data
Environmental Public Health Tracking Program
ericm.brown@state.co.us
(303) 692-3630