Attributes for NHDPlus Version 2.1 Reach Catchments and Modified Routed Upstream Watersheds for the Conterminous United States:
Average Elevation of Water Table Relative to Land Surface
Dataset Identification:
Resource Abstract:
This tabular data set represents average depth to water table relative to the land surface(meters) compiled for two spatial
components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments
and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlus version
2 data suite by the unique identifier COMID. The source data for average depth to water table from the land surface was produced
by Ying Fan and others (written communication, Rutgers University, 2007). Units are meters from land surface. Reach catchment
information characterizes data at the local scale. Reach catchments accumulated upstream through the river network characterizes
cumulative upstream conditions. Network-accumulated values are computed using two methods, 1) divergence-routed and 2) total
cumulative drainage area. Both approaches use a modified routing database to navigate the NHDPlus reach network to aggregate
(accumulate) the metrics derived from the reach catchment scale. (Schwarz and Wieczorek, 2016).
Citation
Title Attributes for NHDPlus Version 2.1 Reach Catchments and Modified Routed Upstream Watersheds for the Conterminous United States:
Average Elevation of Water Table Relative to Land Surface
This data set was created by the U.S. Geological Survey's (USGS) National Water-Quality Assessment Project (NAWQA) which is
part of the USGS National Water Quality Program (NWQP). This effort was undertaken to estimate the average depth to the water
table (meters) from land surface for NHDPlusV2 flowline catchments and upstream river networks to support statistical analysis,
map display, and model parameterization.