WWHM 2025

WWHM 2025 Overview

WWHM2025 is based on WWHM2012. WWHM2012 has been modified to meet the specific requirements for Washington State Department of Ecology.

WWHM2025 is a comprehensive continuous simulation hydrology and hydraulics modeling software package for use in Western Washington.

The purpose of WWHM2025 is to provide a visually-oriented interactive tool that easily and accurately models the hydrology and hydraulics of both urban and rural drainages of all sizes. WWHM2025 includes specialized tools to quantify stormwater and water quality impacts of land use changes on local streams and rivers to meet Flow Duration requirements. It can also be used to review of development plans for compliance with local stormwater regulations.