SIR2005-5073_CBRWM_watersheds

Release Date

2005-01-01

Time Period

2005

Publication Date

2023-09-15

Krstolic, J.L., Martucci, S.K., Hopkins, K.J., and Raffensperger, J.P., 2005, SIR2005-5073_CBRWM_watersheds: U.S. Geological Survey data release, https://doi.org/10.5066/P9HLI5AF.

Type: browseImage

The U.S. Geological Survey, Chesapeake Bay Program, Interstate Commission on the Potomac River Basin, Maryland Department of the Environment, Virginia Department of Conservation and Recreation, and the University of Maryland are collaborating on the Chesapeake Bay Regional Watershed Model (CBRWM), using Hydrological Simulation Program - FORTRAN to simulate streamflow and concentrations and loads of nutrients and sediment. In order to establish a framework for model simulation, digital spatial datasets were created defining the discretization of the model region the (including the Chesapeake Bay Watershed, as well as the adjacent parts of Maryland, Delaware, Virginia, Tennessee, and North Carolina outside the watershed) into land segments, a stream-reach network, and associated watersheds. The stream-reach network for the Chesapeake Bay Watershed part of the model region was based on the USGS Chesapeake Bay SPARROW model stream-reach network. Since that network was created only for the Chesapeake Bay Watershed, the rest of the model region uses a 1:500,000-scale stream-reach network. To standardize watershed size, streams with mean annual streamflow of less than 100 cubic feet per second were excluded based on attributes from the dataset. Additional changes were made to enhance the data and to allow for inclusion of stream reaches with monitoring data that were not part of the original network. The watersheds were coded to indicate major and minor basin, mean annual streamflow, and each watershed's unique identifier as well as that of the downstream watershed. The watershed dataset represents the watershed areas included in the CBRWM. The derived product of the watersheds intersected with land segments serves as the model units. The watersheds are to be used with the CBRWM. Other uses are not suggested.

• Model Data Management Function (MDMF)