Ecology's has released WWHM2012. WWHM2012 is an update to WWHM3.
Access to Version 2.0
Follow the steps below to install WWHM3 (This program is not compatible with Windows 7, 64 bit version)
Instructions for projects in Clark County only
Based on a recent model calibration effort, the soil groups and precipitation gages for Clark County in WWHM3 have changed. The new soil groups and precipitation data for Clark County can be accessed within WWHM3 when “Clark 2010” is selected in the “Map Information” screen. WWHM users can still access the old (default) soil groups and precipitation gage data for the county by selecting “Clark” in the “Map Information” screen. However, users must check with Clark County for instructions on which county map is acceptable for their project in the county.
For instructions on soil groups and other modeling requirements in Clark County, use the following link to the Clark County website:
Clark County "Stormwater code and manual": wwww.clark.wa.gov/environment/stormwater/management/code.html
Clark County WWHM model report:
Clark County WWHM soil groups summary: wwww.clark.wa.gov/environment/stormwater/management/documents/CCWWHMSoilGroupMemo.pdf
If you need help, refer to the WWHM3 User Manual. For more information about the high groundwater module used by program read WWHM3 High Groundwater Parameters.These downloads require Adobe Acrobat Reader to view: If you do not have the free Acrobat Reader installed you may download it from this site.
Suggested procedures for sizing Infiltration Ponds using WWHM (PDF)
WWHM3 gives the user greater modeling flexibility and options. Version 2 was limited to drainages of less than half a square mile (320 acres) because of the lack of a conveyance feature (natural channel or pipe). This limitation does not apply to WWHM3; with Version 3 the user can model entire watersheds of unlimited size as long as they are contained within a single county or use the time series element to transfer flows from one county to an adjacent county.
Specific changes and additions in Version 3 include:
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