Supporting Data
Here you may download supporting data for developing surface water models.
Flood Insurance Study
A portable document format (PDF) version of the new 2006 Jefferson County FIS is available for viewing and download.
GIS Data
In order to locate subbasins used in HEC-1 files on this site, the following
data is made available.
Historical Rainfall
Rainfall Distributions
NOTE: The new version of HEC-HMS (v2.1.2) includes the ability to use the
standard NRCS rainfall distributions (Types I-IV) without using a recording
gage. If you find any problems with this data please report it
here.
HEC-1 format
Rainfall Depths (TP-40)
From page 10-24 of the MSD Design Manual
DSS is a database format developed by HEC for use with their modeling software.
While difficult to get accustomed to, modeling tasks become more efficient. It
is a requirement when using the new HEC-HMS software since all results are
stored in DSS format.
When you download the DSS file here, it is a zip file containing both a DSS
and DSC file. The DSS file is where the data is actually stored in a binary
format and the DSC file is a text file that is a catalog of the contents in the
DSS file.
Listings in the catalog appear in the format
//SCSII24H/PRECIP-CUM/01JAN2000/5MIN/GAGE/
Where each portion separated by a "/" is a path. The path is referred to by letter
and has parts A through F organized in the following manner:
/Part A/Part B/Part C/Part D/Part E/Part F.
For use with HEC-HMS, it is only important to know that
- Part B is the name of the gage,
- Part C is the type of rainfall data (incremental or cumulative),
- Part D is when the rainfall occurred,
- Part E is the time increment of the measurements.
You can use the information in the DSS catalog to assist you in setting up gages in
you HMS model that refer to external DSS files and use the appropriate Control
Specifications.
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