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Engineer defends using hydraulic-gradient-adjusted rate to judge infiltration feasibility
Summary
At the Feb. 10 Meadowview hearing, witness Ms. Decker explained why the project team applied a hydraulic gradient to laboratory-derived KSAT values when estimating measured infiltration for BMP feasibility; appellants' counsel argued the county manual treats KSAT as the measured infiltration rate and applies gradients later at design stage.
During cross-examination at the Feb. 10 Kitsap County hearing on Meadowview, engineering witness Ms. Decker explained the team’s approach to determining whether infiltration best-management practices (BMPs) are feasible on the site.
Kitsap County’s stormwater design manual directs applicants to determine a measured infiltration rate during feasibility studies and to use a design infiltration rate for facility sizing. The appellants’ attorney pointed to manual language and a table that lists a feasibility threshold — a measured infiltration rate of 5 inches per hour or greater for some infiltration BMPs — and asked whether the witness treated the…
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