The Hydrologic Soils Group Map was derived from the soil survey shape files obtained from Soils Datamart (https://sdmdataaccess.nrcs.usda.gov/) which were joined with an appropriate attribute table (derived from the component file ‘comp.txt’ and the mapping unit attribute file) which was distributed with the digital release of the soil surveys. See more information.This layer is maintained by Pima County. Click here to visit Pima County's Open Data site. Click here to visit Pima County's GIS Library metadata. PurposeThis layer was developed to show hydrologic soils groups in Pima County, Arizona.Dataset ClassificationLevel 0 - OpenKnown UsesThis layer is not in any known applications.Known Errors No known errorsContactPima County - GISdata@pima.govUpdate FrequencyAs Needed

Hydrologic data, primarily precipitation and runoff, have been collected on experimental watersheds operated by the U.S. Department of Agriculture Agricultural Research Service (USDA-ARS) and on other lands in southeastern Arizona since the 1950s. These data are of national and international importance and make up one of the most comprehensive semiarid watershed data sets in the world. The USDA-ARS Southwest Watershed Research Center has recently developed an electronic data processing system that includes an online interface (https://tucson.ars.ag.gov/dap) to provide public access to the data. The goal of the system is to promote analyses and interpretations of historic and current data by improving data access. The publicly accessible part of the system consists of an interactive Web site, which provides an interface to the data, and a relational database, which is used to process, store, and manage data. In addition, DAP was expanded to put sediment, meteorological, soil moisture and temperature, vegetation, CO2 and water flux, geographic information system (GIS) and aircraft and satellite spectral imagery data on line and to publish metadata for all WGEW long-term measurements. Resources in this dataset:Resource Title: PDF File. File Name: WGEW Soil Survey.pdf, url: https://www.tucson.ars.ag.gov/dap/Files/WGEW Soil Survey.pdf

Polygon layer that shows the general soil composition in areas across Pima County. The maintenance of this layer is handled by Pima County. For more detailed information, please refer to the original metadata, found here.PurposeShows the general soil composition of areas in Pima County.Dataset ClassificationLevel 0 - OpenKnown UsesUsed in the Green stormwater web map.Known ErrorsNo Known ErrorsData ContactPima County Information Technology Department - Geographic Information Systems201 N Stone Ave., 9th FloorTucson, AZ 85701GISDdata@pima.govUpdate FrequencyThis layer is not Maintained the original data was compiled in 1991.

This layers has the soil survey information done at the Walnut Gulch Experimental Watershed. More on this soil survey can be obtained from this publication: https://www.tucson.ars.ag.gov/dap/Files/WG_EcoSites-Heilman_et_al-AWRA%202010.pdf