{"id":11103,"date":"2019-07-22T21:14:45","date_gmt":"2019-07-22T21:14:45","guid":{"rendered":"http:\/\/www.agron.iastate.edu\/glsi\/?p=4631"},"modified":"2025-10-01T13:11:31","modified_gmt":"2025-10-01T18:11:31","slug":"iowa-depth-to-water-table-gis-data","status":"publish","type":"post","link":"https:\/\/www.agron.iastate.edu\/glsi\/gis-data\/soil-properties-gis-data\/iowa-depth-to-water-table-gis-data\/","title":{"rendered":"Iowa Depth to Water Table GIS Data"},"content":{"rendered":"\n<div class=\"wp-block-ugb-container ugb-container ugb-ee96871 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><style>@media screen and (min-width:768px){.ugb-ee96871.ugb-container{margin-bottom:0px !important}}@media screen and (min-width:768px){.ugb-ee96871 > .ugb-inner-block > .ugb-block-content > *{padding-bottom:0px !important}}<\/style><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-ee96871-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-ee96871-content-wrapper\"><div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h4>Depth to water table is the vertical distance from the ground surface to the <strong data-start=\"106\" data-end=\"152\">upper limit of the seasonal saturated zone<\/strong>. Values are interpreted in soil surveys from direct observations at selected sites and from hydromorphic evidence in profiles (redox features, organic accumulations, and horizon patterns). The map summarizes the <strong data-start=\"365\" data-end=\"383\">representative<\/strong> seasonal water table expected under natural conditions; brief, storm-driven saturation is not considered a water table, and modern drainage or grading may shift conditions locally.<\/h4>\n\n\t<\/div>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-ugb-container ugb-container ugb-8bdbc79 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><style>@media screen and (min-width:768px){.ugb-8bdbc79.ugb-container{margin-bottom:0px !important}}@media screen and (min-width:768px){.ugb-8bdbc79 > .ugb-inner-block > .ugb-block-content > *{padding-top:0px !important;padding-bottom:0px !important}}<\/style><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-8bdbc79-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-8bdbc79-content-wrapper\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-9cc33fa\" data-block-id=\"9cc33fa\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-9cc33fa-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-001bb93\" data-v=\"4\" data-block-id=\"001bb93\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-001bb93-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-001bb93-inner-blocks\"><div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2>Applied Relevance<\/h2>\n<p>Shallow depths signal higher risk of waterlogging, rutting, denitrification, and delayed field access; deeper depths indicate better aeration, rooting, and trafficability. These maps help plan tile drainage and outlet placement, schedule operations, screen sites for basements and septic systems, prioritize wetland protection or restoration, and identify areas more vulnerable to contamination or flooding.<\/p>\n\n\t<\/div>\n<\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-ce9246d\" data-v=\"4\" data-block-id=\"ce9246d\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-ce9246d-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-ce9246d-inner-blocks\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1473\" src=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending.gif\" alt=\"\" class=\"wp-image-13610\" \/><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-ugb-container ugb-container ugb-d1207b7 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><style>.ugb-d1207b7 .ugb-inner-block{text-align:center}@media screen and (min-width:768px){.ugb-d1207b7.ugb-container{margin-bottom:0px !important}}@media screen and (min-width:768px){.ugb-d1207b7 > .ugb-inner-block > .ugb-block-content > *{padding-top:0px !important}}<\/style><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-d1207b7-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-d1207b7-content-wrapper\"><div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2 class=\"text-align-center\">GIS Map Folder Download<\/h2>\n<p class=\"text-align-center\">Click the button below to access the GIS data.<\/p>\n\n\t<\/div>\n<\/div>\n\n\n<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/?ddownload=4676\" title=\"Download\" rel=\"nofollow\" class=\"ddownload-button button-yellow id-4676 ext-\">Download<\/a>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n<div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2>GIS Map Details<\/h2>\n<p>Source data are USDA-NRCS gSSURGO map units and NASIS attributes where water table depth is stored as low, representative, and high estimates. The statewide raster uses the representative value, generalized to map units and gridded at 10-m resolution to match SSURGO cartography. Color ramps are standardized for county and watershed comparison. Use at regional to county scales; verify site-level decisions in the field because inclusions, drainage alterations, and local grading are not captured.<\/p>\n<h2>Metadata \u2013 Sources \u2013 Limitations<\/h2>\n<p>Produced by: Meyer Bohn, Joshua McDanel, and Bradley Miller January (2019)<\/p>\n<p>Created with the gSSURGO mapping toolset for ArcGIS for Desktop 10.6. Available for download at:&nbsp;<br \/>\n<a href=\"https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/survey\/geo\/?cid=nrcs142p2_053628\">https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/survey\/geo\/?cid=nrcs142p2_053628<\/a>&nbsp;<\/p>\n<p>Raster Format: 10-m resolution GeoTIFF, 32-bit floating point<br \/>\nProjection: NAD83 UTM Zone 15N<br \/>\nExtent \u2013 West: -96.801571 East: -90.007463 North: 43.644364 South: 40.302683<\/p>\n<p>Soil Survey Staff. 2018. Natural Resources Conservation Service. United States Department of Agriculture. Gridded Soil Survey Geographic (gSSURGO) Database for Iowa. Accessed 27 Oct 2018.<\/p>\n<p>Use limitations: See \u201cSources of Apparent Error on Existing Soil Maps\u201d. Soil Survey Staff. 2018. Soil Survey Manual \u2013 Ch. 4: Soil Mapping Concepts. Natural Resources Conservation Service. United States Department of Agriculture. Available at:&nbsp;<br \/>\n<a href=\"https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/ref\/?cid=nrcs142p2_054254#quality\">https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/ref\/?cid=nrcs142p2_054254#quality<\/a>&nbsp;<\/p>\n<p>Scale Range: Not intended for use at scales larger than an order 2 Survey (1:12,000 to 1:31,680).<\/p>\n\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4319,"featured_media":13610,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[309],"tags":[228,227,202,170,60,310,121,124,208],"class_list":["post-11103","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soil-properties-gis-data","tag-depth-to-saturation","tag-depth-to-water-table","tag-gis-downloads","tag-gssurgo","tag-iowa","tag-maps","tag-soil-maps","tag-soil-survey","tag-water-table"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending.gif",1920,1473,false],"thumbnail":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending-150x150.gif",150,150,true],"medium":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending-300x230.gif",300,230,true],"medium_large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending-768x589.gif",768,589,true],"large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending-1024x786.gif",1024,786,true],"1536x1536":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending-1536x1178.gif",1536,1178,true],"2048x2048":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/DTWT-Descending.gif",1920,1473,false]},"post_excerpt_stackable_v2":"<p>Depth to water table is the vertical distance from the ground surface to the upper limit of the seasonal saturated zone. Values are interpreted in soil surveys from direct observations at selected sites and from hydromorphic evidence in profiles (redox features, organic accumulations, and horizon patterns). The map summarizes the representative seasonal water table expected under natural conditions; brief, storm-driven saturation is not considered a water table, and modern drainage or grading may shift conditions locally. Applied Relevance Shallow depths signal higher risk of waterlogging, rutting, denitrification, and delayed field access; deeper depths indicate better aeration, rooting, and trafficability. These&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/gis-data\/soil-properties-gis-data\/\" rel=\"category tag\">Soil Properties GIS Data<\/a>","author_info_v2":{"name":"emlemke","url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/emlemke\/"},"comments_num_v2":"0 comments","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Iowa Depth to Water Table GIS Data - Geospatial Laboratory for Soil Informatics<\/title>\n<meta name=\"description\" content=\"Download GIS GeoTIFF raster maps of Iowa depth to water table for 12 months of the year derived from the National Cooperative Soil Survey&#039;s gSSURGO database.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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