USGS Washington Water Science Center
|Project Summaries | Partnerships ||
WA206 - Sediment Discharge in May Creek Basin, King County - Completed FY1983
Problem - Although relatively unurbanized now, May Creek basin is expected to undergo development soon to accommodate the growth of metropolitan Seattle. The responsible agency, Municipality of Metropolitan Seattle (Metro) requires water quality data under present conditions to use in evaluating effectiveness of measures taken to control degradation of water quality during and after development. An immediate problem is the delta formed by May Creek sediment in Lake Washington; the delta interferes with log storage at the mouth and, perhaps, with operations of a nearby marina.
Objectives - In a cooperative study, Metro and USGS plan to document the present quality (including sediment) of May Creek at the mouth and at several points along the stream. The study will include determination of the quality of water in streams from subbasins typical of the various land uses in the May Creek drainage. The relation of water quality to streamflow and characteristics of the basins, and the contribution of quality of subbasin streams to the quality of May Creek will be evaluated.
Approach - Sample frequently enough to enable determination of water quality and flow during one complete year at mouth and 2 upstream stations of May Creek and at stations on 2 main tributaries near their mouths. Precipitation will be measured at mouth, midbasin, and near upstream end of May Cr. Data collected during intensive sampling of about 5 of the usual 10 annual storms will be used to analyze the relation of water quality to streamflow (runoff), precipitation, and basin characteristics (land use). An evaluation of the first year's results will be made to determine future operation of the project.