{"id":122361,"date":"2012-08-14T15:56:22","date_gmt":"2012-08-14T15:56:22","guid":{"rendered":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/using-nhdplus-to-address-sedimentation-risks-to-water-quality-and-availability-in-texas-reservoirs\/"},"modified":"2012-08-14T15:56:22","modified_gmt":"2012-08-14T15:56:22","slug":"using-nhdplus-to-address-sedimentation-risks-to-water-quality-and-availability-in-texas-reservoirs","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/product\/water\/using-nhdplus-to-address-sedimentation-risks-to-water-quality-and-availability-in-texas-reservoirs","title":{"rendered":"Using NHDPlus to address sedimentation risks to water quality and availability in Texas reservoirs"},"author":4911,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[23051],"tags":[24981,26931,26941,39251,32071,39261,26541],"industry":[],"product":[],"class_list":["post-122361","blog","type-blog","status-publish","format-standard","hentry","category-water","tag-hydro","tag-nhd","tag-nhdplus","tag-sedimentation","tag-texas","tag-texas-water-development-board","tag-usgs"],"acf":{"short_description":"by Ernest To* - RPS Espey, Carissa Belsky - Crespo Consulting Services, Inc., David Harkins - RPS Espey,\n\nJim Patek - Parsons Corporation...","flexible_content":[{"acf_fc_layout":"content","content":"<p><strong>by Ernest To* &#8211; RPS Espey, Carissa Belsky &#8211; Crespo Consulting Services, Inc., David Harkins &#8211; RPS Espey,<\/strong><\/p>\n<p><strong>Jim Patek &#8211; Parsons Corporation, Steve Stecher &#8211; Crespo Consulting Services, Inc., Mel Vargas &#8211; Parsons Corporation,<\/strong><\/p>\n<p><strong>Jennifer Walker &#8211; Watearth, Inc.<\/strong><\/p>\n<p><strong>* =corresponding author<\/strong><\/p>\n<p><strong><em><img loading=\"lazy\" decoding=\"async\" class=\"alignleft\" style=\"margin-right: 10px\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRes\/Thumb2.png\" alt=\"\" width=\"210\" height=\"143\" \/><\/em><\/strong>Sedimentation in Texas reservoirs is a significant problem that affects both water availability and quality in Texas.\u00a0 The <a title=\"Texas Water Development Board\" href=\"http:\/\/www.twdb.state.tx.us\/\"><strong>Texas Water Development Board<\/strong><\/a> estimates that Texas&#8217; major reservoirs are losing 90,000 acre-feet per year due to sedimentation. This is equivalent to a loss of 4.5 million acre-feet by 2060 and exceeds the projected increase of 3.4 million acre-feet from new reservoirs.\u00a0\u00a0 The reduction in storage volume not only impacts water supply but also necessitates the alteration of supply infrastructure to handle deteriorating water quality.\u00a0 Uncertainty regarding rainfall supply due to climate change further burdens the already stressed reservoirs.<\/p>\n<p><!--more--><\/p>\n<p><strong><em> <\/em><\/strong><\/p>\n<p><strong><em> <\/em><\/strong><\/p>\n<p><strong><em> <\/em><\/strong><\/p>\n<p><strong><em> <\/em><\/strong><\/p>\n<p><strong><em><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRES\/Fig1.jpg\" alt=\"Major reservoirs in the State of Texas.\" width=\"462\" height=\"351\" \/><\/em><\/strong><\/p>\n<p><strong><em> <\/em><\/strong><\/p>\n<p><strong><em> <\/em><\/strong><em>Figure 1: Major reservoirs in the State of Texas.<\/em><\/p>\n<p><strong>Approach<\/strong><\/p>\n<p>A statewide study was conducted for the Texas Water Development Board to assemble the data and tools needed to identify the reservoirs that are most at-risk for sedimentation in Texas.\u00a0 This study involved substantial use of EPA\u2019s <strong><a title=\"NHDPlus\" href=\"http:\/\/www.horizon-systems.com\/nhdplus\/\">NHDPlus dataset<\/a><\/strong> to delineate and characterize watersheds for almost two hundred major reservoirs in Texas.<\/p>\n<p>Apart from spatial data, NHDPlus also contains a lot of data associated with erosion and sedimentation in its value-added attribute tables.\u00a0 These include land use and land cover information (related to watershed erosion), stream length and order (channel erosion), and, elevation and precipitation (slope and runoff), etc.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" alignnone\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRES\/Fig2.jpg\" alt=\"Watersheds for Texas reservoirs delineated using NHDPlus.\" width=\"462\" height=\"414\" \/><\/p>\n<p><em>Figure 2: Watersheds for Texas reservoirs delineated using NHDPlus.<\/em><\/p>\n<p><strong>Maps<\/strong><\/p>\n<p>After extracting the relevant information from NHDPlus, maps were created for each of the 190+ major reservoirs in Texas to summarize the associated sediment-related data.\u00a0 These include information on watershed area, slope, soil erodibility, stream length, stream density, precipitation, temperature, reservoir area, volume, residence time and shoreline development index.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" alignnone\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRES\/Fig3.jpg\" alt=\"A data summary map developed for Lake Travis near Austin, TX.\" width=\"782\" height=\"580\" \/><\/p>\n<p><em>Figure 3: A data summary map developed for Lake Travis near Austin, TX.<\/em><\/p>\n<p><strong>Decision Support Tool<\/strong><\/p>\n<p>The sediment related data were incorporated into a versatile decision support system (DSS).\u00a0 This decision support system is a software tool\u00a0 that allows users to assign weights for each category of sedimentation data.\u00a0 These weights were later used to score the reservoirs.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" alignnone\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRES\/Fig4.jpg\" alt=\"Assignment of weights for the ranking of reservoirs at risk for sedimentation.\" width=\"513\" height=\"382\" \/><\/p>\n<p><em>Figure 4: Assignment of weights for the ranking of reservoirs at risk for sedimentation.<\/em><\/p>\n<p>The scores were ranked to identify the most at-risk reservoirs for further studies and watershed protection planning.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" alignnone\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRES\/Fig5.jpg\" alt=\"Reservoirs in Texas ranked by sedimentation risk.\" width=\"727\" height=\"482\" \/><\/p>\n<p><em>Figure 5: Reservoirs in Texas ranked by sedimentation risk.<\/em><\/p>\n<p><strong>Conclusions<\/strong><\/p>\n<p><a href=\"http:\/\/www.twdb.state.tx.us\/RWPG\/rpgm_rpts\/1004821120_reservoirs.pdf\"><\/a><a title=\"Watershed Protection for Texas Reservoirs\" href=\"http:\/\/www.twdb.state.tx.us\/RWPG\/rpgm_rpts\/1004821120_reservoirs.pdf\">This study<\/a> compiled data from many sources to help stakeholders identify which reservoirs are most at-risk for sedimentation.\u00a0 Apart from the NHDPlus data and the DSS tool described above, a substantive compilation of available empirical sedimentation rates was also performed.\u00a0 In addition, a Best Management Practices matrix that lists commonly-used landscape-based structural BMPs was created.\u00a0 Together, these set of tools and databases can help users identify sedimentation risks as well as methods to address them at a planning level.<\/p>\n<p><strong>Acknowledgements<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft\" style=\"margin-right: 10px\" src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/TXRES\/Fig6.jpg\" alt=\"Texas Water Development Board\" width=\"232\" height=\"63\" \/>This study was completed with funding from the Texas Water Development Board (TWDB contract #: 1004831120).\u00a0 The authors would like to thank Dr. Ruben Solis and Dr. Yujuin Yang from the Texas Water Development Board for their guidance in this study.<\/p>\n<p><a title=\"Watershed Protection for Texas Reservoirs\" href=\"http:\/\/www.twdb.state.tx.us\/publications\/reports\/contracted_reports\/doc\/1004821120_reservoirs.pdf\"><strong>View the report.<\/strong><\/a><\/p>\n<p><strong><br \/>\n<\/strong><\/p>\n"}],"authors":[{"ID":4911,"user_firstname":"Caitlin","user_lastname":"Scopel","nickname":"Caitlin Scopel","user_nicename":"coscopel","display_name":"Caitlin Scopel","user_email":"CScopel@esri.com","user_url":"","user_registered":"2018-03-02 00:16:31","user_description":"Senior Project Manager for the ArcGIS Living Atlas of the World Environment Team. Caitlin works on projects that utilize environmental data from local, state, national and global institutions.","user_avatar":"<img data-del=\"avatar\" src='https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2019\/04\/G68235_CaitlinScopel_22-150x150.jpg' class='avatar pp-user-avatar avatar-96 photo ' height='96' width='96'\/>"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Using NHDPlus to address sedimentation risks to water quality and availability in Texas reservoirs<\/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.esri.com\/arcgis-blog\/products\/product\/water\/using-nhdplus-to-address-sedimentation-risks-to-water-quality-and-availability-in-texas-reservoirs\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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