Modified NHDPlusV2.1 (100k) Catchments for the Chesapeake Bay Watershed

<div style="text-align:Left;"><div><div><p style="background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;"><strong>Open the Data Source:</strong> <a target="_blank" href="https://gis.chesapeakebay.net/ags/rest/services/Boundaries/CBW_NHDv21_catchment_albers_30m_2022/MapServer/0">https://gis.chesapeakebay.net/ags/rest/services/Boundaries/CBW_NHDv21_catchment_albers_30m_2022/MapServer/0</a></p><p style="background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;">The catchment and catchment routing data in NHDv2.1 products are used to understand flow to and assess water quality impacts on the Chesapeake Bay. The areas of land captured in the catchments representing the watershed are outdated due to man-made storm drains and pumping practices. The modified 1:100k Catchments for the Chesapeake Bay Watershed layer is an updated National Hydrography Dataset Plus (NHDPlus) v2.1 catchment layer which incorporates storm drain information in Chesapeake City, Virginia, to better reflect flow to the Chesapeake Bay. The modified layer contains 83,628 catchments, covering a 170,470.97 square kilometer area. The modified catchments are still usable with other native NHDPlus products, including routing information and streamlines.</p><p style="background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;">NHDPlus is an integrated suite of application-ready geospatial data products, incorporating many of the best features of the National Hydrography Dataset (NHD), the National Elevation Dataset (NED), and the National Watershed Boundary Dataset (WBD). NHDPlus, based on the medium resolution NHD (1:100,000-scale), includes the stream network and improved linear networking, feature naming, and “value added attributes” (VAA). NHDPlus also includes elevation-derived catchments.</p><p style="background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;">The 30-meter resolution raster representation of the catchments can be downloaded at <a style="border:0px solid currentcolor; box-sizing:border-box; color:rgb(0, 97, 155); font-family:inherit; line-height:1.5; text-decoration:none;" target="_blank" href="https://gis-data.chesapeakebay.net/NHD/Modified_CBW_NHDv21_catchment_raster.zip">https://gis-data.chesapeakebay.net/NHD/Modified_CBW_NHDv21_catchment_raster.zip</a>.</p></div></div></div>