Region 8

Region 8 State Precipitation Maps

Your NPDES Biosolids Permit requires additional soil sampling if your land application site is in an area receiving greater than 18 inches of precipitation on an average basis. The thirty year time frame selected for the permit term is the annual precipitation from 1961 - 1990. The .pdf files below are from the PRISM project: The "Parameter-elevation Regressions on Independent Slopes Model" is a knowledge-based system that uses point measurements of precipitation, temperature, and other climate elements to produce continuous, digital coverages.

These products were developed through a partnership between the NRCS National Water and Climate Center (NWCC) and the Spatial Climate Analysis Service (SCAS) at Oregon State University. Additional Precipitation maps (25year-24hour, 100year-24hour) are also provided and may assist your in other projects.

To view a map of our choice for your permit, please visit this ftp folder.