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Thank you for evaluating WWHM (version 2.0). The program has been redesigned to provide the flexibility to handle unequal pre-developed and post-developed areas and the capability to simulate multiple ponds and basins. In addition, the program has an "Autopond" algorithm that can generate pond designs that in most cases will be optimally sized to pass the flow duration standard. The program can also generate design flow rates and volume for use in sizing stormwater treatment BMPs.
Under Help\Content\ there is a "Quick Start" option that provides an overview of the program features and operation.
WWHM2 Download and Installation Instructions (7-28-03) (PDF)
NOTE: Some Windows 2000 users have experienced installation difficulties with wwhm2.5e. You may try installing the wwhm2.6 version by downloading "WWHM2.6Setup.msi" and "allmaps.zip". When downloading these files, please remember not to save the downloads in C:\Program Files\WWHM2 folder. (However, allow WWHM2 program to be installed in C:\Program Files\WWHM2 folder).
DRAFT Western Washington Hydrology Model Version 2.1 User's Manual
Suggested procedures for sizing Infiltration Ponds using WWHM (PDF)
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wwhm2-patch-to-update-version-2.5e-to-2.5f.exe (NOTE: When using
"File/New Project," please go to "View/Preferences/MISC" and click on
"Restore Defaults" and then "UPDATE." This will make sure that the "Pan Evap"
is correctly set to "0.76." This bug was recently found and occurs only if
you use "File/New Project.") The patch below will fix this bug and update WWHM2.5e to WWHM2.5f. To use
the patch you must (1)- have already setup WWHM2.5e on your computer; (2)-
download the patch and double click on it and
unzip it in the default C:\Program Files\WWHM2
folder wwhm2-patch-to-update-version-2.5e-to-2.5f.exe Download and double click on this patch to unzip it in the default C:\Program Files\WWHM2 folder. This will fix a bug and update WWHM2.5e to WWHM2.5fCheck out county updates below Major items in the 1-12-04 update: Based on a December 2003 report
by MGS Engineering Consultants, Inc., the relationship for converting the
water quality design flows from hourly to 15 minute flows has been updated.
The new relationship has been developed using 25 years of actual 15-minute
precipitation data from a Seattle Public Utility gage located near the
University of Washington Hydraulics Laboratory in Seattle. This new
relationship is shown below: For mixed till and outwash sites, the 15-minute to 60-minute ratio can be
expressed as a weighted average of the till and outwash areas: R15/60
= 1.13*Woutwash + Wtill *[ 1.00 + 0.13*(imperv) ] where: Woutwash is the fraction of the site that contains
outwash deposits; Wtill is the fraction of the site underlain by
till, and Woutwash + Wtill = 1 ; and imperv is the
fraction of the site covered by impervious surfaces. |
County map files for Version 2.0:
| Clallam (updated 8/28/03) | Kitsap (updated 7/18/03) | Skagit |
| Clark | Lewis | Skamania (updated 12/12/02) |
| Cowlitz | Mason | Snohomish |
| Grays Harbor | Pacific | Thurston |
| Island (updated 12/12/02) | Pierce | Wahkiakum |
| Jefferson (updated 8/28/03) | San Juan | Whatcom (updated 2/12/03) |
| King |
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
