AZWRAP/DrinkingWaterImportanceAreas (ImageServer)

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Service Description: This Drinking Water Importance Areas layer identifies an index of surface drinking water importance, reflecting a measure of water quality and quantity, characterized by Hydrologic Unit Code 12 (HUC 12) watersheds. The Hydrologic Unit system is a standardized watershed classification system developed by USGS (http://nwis.waterdata.usgs.gov/tutorial/huc_def.html). Areas that are a source of drinking water are of critical importance and adverse effects from fire are a key concern. The U.S. Forest Service Forests to Faucets (F2F) project is the primary source of the drinking water data set (http://www.fs.fed.us/ecosystemservices/FS_Efforts/forests2faucets.shtml). This project used GIS modeling to develop an index of importance for supplying drinking water using HUC 12 watersheds as the spatial resolution. Watersheds are ranked from 1 to 100 reflecting relative level of importance, with 100 being the most important and 1 the least important. Several criteria were used in the F2F project to derive the importance rating including water supply, flow analysis, and downstream drinking water demand. The final model of surface drinking water importance used in the F2F project combines the drinking water protection model, capturing the flow of water and water demand, with a model of mean annual water supply. The values generated by the drinking water protection model are simply multiplied by the results of the model of mean annual water supply to create the final surface drinking water importance index (Weidner, E., Todd, A. 2011). Watersheds are ranked from 1 to 10 reflecting relative level of importance, with 10 being the most important and 1 the least important.

Name: AZWRAP/DrinkingWaterImportanceAreas

Description: This Drinking Water Importance Areas layer identifies an index of surface drinking water importance, reflecting a measure of water quality and quantity, characterized by Hydrologic Unit Code 12 (HUC 12) watersheds. The Hydrologic Unit system is a standardized watershed classification system developed by USGS (http://nwis.waterdata.usgs.gov/tutorial/huc_def.html). Areas that are a source of drinking water are of critical importance and adverse effects from fire are a key concern. The U.S. Forest Service Forests to Faucets (F2F) project is the primary source of the drinking water data set (http://www.fs.fed.us/ecosystemservices/FS_Efforts/forests2faucets.shtml). This project used GIS modeling to develop an index of importance for supplying drinking water using HUC 12 watersheds as the spatial resolution. Watersheds are ranked from 1 to 100 reflecting relative level of importance, with 100 being the most important and 1 the least important. Several criteria were used in the F2F project to derive the importance rating including water supply, flow analysis, and downstream drinking water demand. The final model of surface drinking water importance used in the F2F project combines the drinking water protection model, capturing the flow of water and water demand, with a model of mean annual water supply. The values generated by the drinking water protection model are simply multiplied by the results of the model of mean annual water supply to create the final surface drinking water importance index (Weidner, E., Todd, A. 2011). Watersheds are ranked from 1 to 10 reflecting relative level of importance, with 10 being the most important and 1 the least important.

Single Fused Map Cache: false

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Pixel Size Y: 30.0

Band Count: 1

Pixel Type: S8

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Standard Deviation Values: 1.8121145648290795

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Supported Operations: Export Image Identify Measure Compute Histograms Compute Statistics Histograms Get Samples Compute Class Statistics Query Boundary Compute Pixel Location