Harvey Basemap - Hydrology Map Data

This resource contains medium-resolution (1:100k) National Hydrography Dataset (NHDPlus) [1] map data for a region of 39 Hydrologic Unit Code (HUC) 6-digit (HUC6) basins around the Hurricane Harvey impact zone across Texas, Louisiana, Mississippi and Arkansas. This includes 5978 subwatersheds, 190,192 catchments, and 192,267 flowlines.

USGS active stream gages (924) were downloaded from the USGS National Water Information System (NWIS) [2] and augmented with each gage's HUC2, HUC4, HUC6, HUC8, HUC10 & HUC12 basin identifiers, and COMID of the NHD stream reach for the containing catchment. This allows the user to easily aggregate gages by various watershed boundaries.

NOAA Advanced Hydrologic Prediction System (AHPS) [3] has 362 river forecast points in the Harvey study area. Many of these are co-located with USGS NWIS gages to leverage authoritative observation data.

A shapefile of Texas dams (7290) was directly received from the Texas Commission for Environmental Quality (TCEQ) [4]. They suggest if you have any questions about data, to make an Open Records Request [5].

References
[1] NHDPlus Version 2 [http://www.horizon-systems.com/NHDPlus/V2NationalData.php]
[2] USGS NWIS [https://waterdata.usgs.gov/nwis]
[3] NOAA AHPS [https://water.weather.gov/ahps/forecasts.php]
[4] TCEQ Data and Records [https://www.tceq.texas.gov/agency/data]
[5] TCEQ Open Records Request [https://www.tceq.texas.gov/agency/data/records-services/reqinfo.html]

本数据集涵盖德克萨斯州、路易斯安那州、密西西比州及阿肯色州飓风哈维影响区域周边的39个6位水文单元编码（Hydrologic Unit Code, HUC6）流域，包含中等分辨率（1:10万）的国家水文数据集（National Hydrography Dataset, NHDPlus）[1]地图数据，共计5978个子汇水区、190192个集水区与192267条流线。

研究团队从美国地质调查局（United States Geological Survey, USGS）国家水信息系统（National Water Information System, NWIS）[2]下载了924个活跃河道测站数据，并为每个测站补充了其所属的HUC2、HUC4、HUC6、HUC8、HUC10及HUC12流域标识符，以及对应集水区的NHD河道河段COMID，便于用户基于各类流域边界对测站进行聚合分析。

美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）高级水文预报系统（Advanced Hydrologic Prediction System, AHPS）[3]在本次哈维研究区域内设有362个河道预报站点，其中多数站点与USGS NWIS测站重合，以复用权威观测数据。

得克萨斯州环境质量委员会（Texas Commission for Environmental Quality, TCEQ）[4]直接提供了该州7290座水坝的形状文件。该委员会提示，若对数据存在疑问，可提交公开记录申请[5]。

参考文献
[1] NHDPlus 第2版 [http://www.horizon-systems.com/NHDPlus/V2NationalData.php]
[2] USGS NWIS [https://waterdata.usgs.gov/nwis]
[3] NOAA AHPS [https://water.weather.gov/ahps/forecasts.php]
[4] TCEQ 数据与档案 [https://www.tceq.texas.gov/agency/data]
[5] TCEQ 公开记录申请 [https://www.tceq.texas.gov/agency/data/records-services/reqinfo.html]