Texas Basemap - Hydrology Map Data

This resource contains Texas statewide hydrologic map data for about 100,000 NHD (National Hydrography Dataset) stream reaches and associated catchments & subwatersheds [1], covering 190,000 stream miles in Texas. Additional map layers include dams, FEMA floodplains and warning zones [2], stream gages [3], and National Weather Service River Forecast Points [4].

The USGS stream gages and NWS AHPS forecast points both have a URL field, which takes you to the authoritative webpage for each selected gage or forecast point.

References
[1] NHDPlus Version 2 [http://www.horizon-systems.com/NHDPlus/V2NationalData.php]
[2] Esri Living Atlas [https://livingatlas.arcgis.com]
[3] USGS NWIS [https://waterdata.usgs.gov/nwis]
[4] NOAA AHPS [https://water.weather.gov/ahps/forecasts.php]

本资源包含德克萨斯州全州范围的水文地图数据，涉及约10万个国家水文数据集（NHD）流域和相关的集水区及次流域[1]，覆盖德克萨斯州约19万英里的溪流。此外，还包括水库、联邦紧急事务管理署（FEMA）的洪水平原和预警区[2]、溪流流量计[3]以及国家气象服务河流预报点[4]。美国地质调查局（USGS）的溪流流量计和国家气象服务（NWS）的高级洪水预测系统（AHPS）预报点均包含一个URL字段，可链接至每个选定流量计或预报点的权威网页。

参考文献
[1] NHDPlus 版本 2 [http://www.horizon-systems.com/NHDPlus/V2NationalData.php]
[2] Esri 活跃图集 [https://livingatlas.arcgis.com]
[3] USGS 国家水信息系统 [https://waterdata.usgs.gov/nwis]
[4] 美国海洋和大气管理局（NOAA）高级洪水预测系统 [https://water.weather.gov/ahps/forecasts.php]