{"id":537,"date":"2014-10-26T19:05:12","date_gmt":"2014-10-26T19:05:12","guid":{"rendered":"http:\/\/www.agron.iastate.edu\/glsi\/?p=537"},"modified":"2025-11-27T20:23:32","modified_gmt":"2025-11-28T02:23:32","slug":"pre-settlement-water-regimes-of-iowa-wetlands-gis-data","status":"publish","type":"post","link":"https:\/\/www.agron.iastate.edu\/glsi\/gis-data\/soil-interpretations-gis-data\/pre-settlement-water-regimes-of-iowa-wetlands-gis-data\/","title":{"rendered":"Pre-settlement Water Regimes of Iowa Wetlands 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\n\tclass=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h4>This raster estimates pre-settlement (pre-drainage) wetland water regimes across Iowa\u2014the natural, undrained condition before widespread tiling and channelization. Soil map units from gSSURGO were linked to regime classes described in Official Soil Series Descriptions (OSD) and harmonized to National Wetland Inventory (NWI) definitions. Because hydromorphic soil indicators persist for decades and much Iowa mapping occurred roughly 100\u2013150 years after drainage expansion, OSD wetness notes provide a reasonable proxy for historic hydrology. Use this layer as baseline context rather than a depiction of current conditions.<\/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\n\tclass=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2>Applied Relevance<\/h2>\n<p>The map supports restoration targeting by highlighting landscapes likely to have supported wetlands prior to drainage; informs conservation planning by pointing to places with high potential for flood storage, nutrient removal, and habitat; adds historical context for mitigation and permitting; frames watershed assessments of drainage legacies on peak flow, denitrification, and baseflow; and serves education and historical-ecology uses by showing how soils record long-term wetness across landforms.<\/p>\n<h2><strong data-start=\"1286\" data-end=\"1310\">Water-regime classes<\/strong><\/h2>\n<p>Classes follow NWI conventions. Areas may be saturated at or near the surface without persistent standing water, temporarily flooded for brief periods during the growing season, seasonally flooded for extended periods in most years, semipermanently flooded through much of the growing season, or permanently flooded\/open water in most years. See the map legend for the exact codes applied.<\/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=\"480\" height=\"316\" src=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png\" alt=\"\" class=\"wp-image-5330\" srcset=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png 480w, https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1-300x198.png 300w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><\/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\n\tclass=\"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=5333\" title=\"Download\" rel=\"nofollow\" class=\"ddownload-button button-yellow id-5333 ext-\">Download<\/a>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n<div\n\tclass=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2>GIS Map Details<\/h2>\n<p>Inputs include gSSURGO polygons and OSD hydrology notes, aligned to NWI regime definitions. Series were assigned to a historic water-regime class, dissolved to map units, and rasterized to a statewide grid with modest generalization to avoid over-precision near boundaries. Deliverables are a GeoTIFF raster of integer class values with a legend\/readme. The intended use is regional to watershed-scale screening; site-level decisions should be field-verified.<\/p>\n<h2>Metadata \u2013 Sources \u2013 Limitations<\/h2>\n<p><!-- wp:paragraph --><\/p>\n<p>The layer reflects historic potential, not present-day hydrology. OSD text varies in detail through time, and some series were mapped long after drainage changes. Modern alterations\u2014ditches, ponds, tiles, fill\u2014are not represented. Interpret comparatively to identify areas likely or unlikely to have supported wetland regimes rather than as precise site delineations.<\/p>\n<p>Miller, B.A., W.G. Crumpton, and A.G. van der Valk, 2009. Spatial distribution of historical wetland classes on the Des Moines Lobe, Iowa. Wetlands 29:1146-1152. doi:&nbsp;<a title=\"Spatial distribution of historical wetland classes on the Des Moines Lobe, Iowa\" href=\"http:\/\/link.springer.com\/article\/10.1672%2F08-158.1\" target=\"_blank\" rel=\"noopener noreferrer\">10.1672\/08-158<\/a>.<\/p>\n<p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p>\n<p>Soil Survey Staff. 2014. Official Soil Series Descriptions (OSD). United States Department of Agriculture, Natural Resources Conservation Service.&nbsp;<a title=\"Official Soil Series Descriptions\" href=\"https:\/\/soilseries.sc.egov.usda.gov\/osdname.asp\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/soilseries.sc.egov.usda.gov\/osdname.asp<\/a><\/p>\n<p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p>\n<p>Soil Survey Staff. 2014. Gridded Soil Survey Geographic (gSSURGO). United States Department of Agriculture, Natural Resources Conservation Service.&nbsp;<a title=\"NRCS geospatial data gateway\" href=\"http:\/\/datagateway.nrcs.usda.gov\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/datagateway.nrcs.usda.gov<\/a><\/p>\n\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":3216,"featured_media":5330,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[304],"tags":[60,80,124,143,145,147,148],"class_list":["post-537","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soil-interpretations-gis-data","tag-iowa","tag-national-wetland-inventory","tag-soil-survey","tag-water-regime","tag-wetland-classification","tag-wetland-restoration","tag-wetlands"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png",480,316,false],"thumbnail":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1-150x150.png",150,150,true],"medium":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1-300x198.png",300,198,true],"medium_large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png",480,316,false],"large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png",480,316,false],"1536x1536":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png",480,316,false],"2048x2048":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2014\/10\/IA_ps-wetlands-1.png",480,316,false]},"post_excerpt_stackable_v2":"<p>This raster estimates pre-settlement (pre-drainage) wetland water regimes across Iowa\u2014the natural, undrained condition before widespread tiling and channelization. Soil map units from gSSURGO were linked to regime classes described in Official Soil Series Descriptions (OSD) and harmonized to National Wetland Inventory (NWI) definitions. Because hydromorphic soil indicators persist for decades and much Iowa mapping occurred roughly 100\u2013150 years after drainage expansion, OSD wetness notes provide a reasonable proxy for historic hydrology. Use this layer as baseline context rather than a depiction of current conditions. Applied Relevance The map supports restoration targeting by highlighting landscapes likely to have supported wetlands prior&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/gis-data\/soil-interpretations-gis-data\/\" rel=\"category tag\">Soil Interpretations GIS Data<\/a>","author_info_v2":{"name":"Bradley Miller","url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/millerba\/"},"comments_num_v2":"0 comments","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pre-settlement Water Regimes of Iowa Wetlands GIS Data - Geospatial Laboratory for Soil Informatics<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.agron.iastate.edu\/glsi\/gis-data\/soil-interpretations-gis-data\/pre-settlement-water-regimes-of-iowa-wetlands-gis-data\/\" 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