Soil - Plant - Atmosphere - Water Field & Pond Hydrology

<p><a href="https://www.nrcs.usda.gov/wps/portal/nrcs/detailfull/national/water/manage/drainage/?cid=stelprdb1045331">SPAW is a daily hydrologic budget model</a> for agricultural fields and ponds (wetlands, lagoons, ponds and reservoirs). Included are irrigation scheduling and soil nitrogen. Data input and results are graphical screens.</p> <p>The <a href="https://hrsl.ba.ars.usda.gov/SPAW/Index.htm">SPAW</a> (Soil-Plant-Air-Water) computer model simulates the daily hydrologic water budgets of agricultural landscapes by two connected routines, one for farm fields and a second for impoundments such as wetland ponds, lagoons or reservoirs. Climate, soil and vegetation data files for field and pond projects are selected from those prepared and stored with a system of interactive screens. Various combinations of the data files readily represent multiple landscape and ponding variations. </p> <div><br>Resources in this dataset:</div><br><ul><li><p>Resource Title: Soil Water Characteristics - Equations.</p> <p>File Name: Soil Water Characteristics-Equations.xls</p></li><br><li><p>Resource Title: Instructions for Access to USDA / NRCS Soils Data.</p> <p>File Name: Accessing USDA Soils Data.pdf</p></li><br><li><p>Resource Title: Evaporation default files for USA.</p> <p>File Name: SPAW Evaporation Default Files.zip</p><p>Resource Description: These *.djvu files require a free reader plug-in available from : <a href="http://www.djvuzone.org/download.html" target="_blank">http://www.djvuzone.org/download.html</a>.</p></li></ul>

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