Notes
Exhibit 199 (AR 018521) from the PCHB Third Runway EIS proceedings. Reports average simulated and observed 7-day low streamflows for Walker Creek at the mouth (water-years 1993–1996) and near the wetland (water-years 1991–1996), and Des Moines Creek near the mouth and gage 11c (water-years 1991–1996). Tables 2-3 and 2-4 compare observed vs. calibrated average flows in cfs for Walker Creek; Tables 2-5 and 2-6 cover Des Moines Creek. Calibrated low flows at mouth gages were generally accurate; upstream gages showed lower predicted than observed flows, attributed to speculative groundwater conditions in Miller Creek, Walker Creek, and Des Moines Creek watersheds. Document is part of STIA Master Plan Update Improvements low streamflow analysis, project number 556-2912-001(28B), prepared by Brascher.