| |
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
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
< Back to ...
| |
|