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Hydrology

NOAA Atlas 14 Rainfall Data

Virginia NRCS Interim Guidance for Incorporating NOAA Atlas 14 Rainfall Data in Conservation Engineering (EFH Ch 2 Amendment VA3)

Virginia Rainfall Zone Maps Using NOAA Atlas 14 Data

Virginia NRCS NOAA Atlas 14 Rainfall Data, updated January 2008

Engineering Field Handbook, Chapter 2 Runoff and Peak Discharge Software

  • Rainfall Database

EFH-2 Runoff and Peak Discharge software requires a twenty-four hour rainfall database for each county, city, and rainfall zone division in Virginia. The twenty-four hour rainfall database is titled “COUNTY.VA”. This file should be used to replace the TP40 based data file currently used by the EFH2 hydrology computer program. To save this file, right-click on the link below, select "Save Target As." Then, change the "Save File Type As," to "All Files" via the drop down. Save the file into C:\Program Files\USDA\EFH2 on your computer. This will replace the existing TP40 based data file. Once you type in "VA" for the state under the Basic Data tab in the EFH2 program, you will see every county, city and rainfall zone in Virginia in the pull-down.

  • Hydrologic Soil Group Database

    EFH-2 Runoff and Peak Discharge software now has a Hydrologic Soil Group database for Virginia. Once the database is stored in the EFH2 program folder on your computer (see instructions below to download HSG database), you can search Virginia soils to determine the Hydrologic Soil Group. Type “VA” for the state under the Basic Data tab in the EFH2 program, click on the HGS button while within the RCN tab of the software, and a window will pop up with "Soil Name" "Surface Texture" and "Hydrologic Group".   This database can be used in lieu of Table 2.1 Hydrologic soil groups for U.S. soil in the Engineering Field Handbook, Chapter 2.

    To save this file (SOILS.HG), right-click on the link below, select "Save Target As." Then, change the "Save File Type As," to "All Files" via the drop down. Save the file into C:\Program Files\USDA\EFH2 on your computer.
     

USGS Regression Equations

  USGS regression equations for estimating peak discharges of rural, unregulated streams in Virginia (USGS Fact Sheet 023-01, 2001)

Hydrology Training

Comparison and Application of Various Hydrologic Methods

Field Engineering Hydrology - A - Z

Hydrology Training Modules

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