Storm Water Master Plan for Josephine County, Oregon — a Case Study

A free white paper by XP Solutions

The Josephine County Public Works Department in Josephine County, Oregon, used an integrated one-dimensional/two-dimensional (1D/2D) model for storm water master plan assessment. When a storm water conveyance system is under capacity, a 1D schematization alone cannot accurately model flow once it surcharges out of the 1D elements. The linkage of 1D and 2D models allows water to move out of a 1D element then return to the same or another 1D element. This complete description eliminates model losses due to surcharging and inaccurate 1D description of surface storage. For example, flows leaving an irrigation canal, defined with cross sections in 1D, can flow overland via the 2D grid cells to a downstream irrigation canal or stream.

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