USGS Washington Water Science Center
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WA175 - Water Resources Of The Chehalis Indian Reservation - Completed FY1974
Problem - Much of the Chehalis Indian Reservation is subject to periodic flooding. The inundation affects the location of housing developments and may affect the performance of septic tanks. Existing ground-water supplies are adequate for proposed food-processing plants but the Tribe desires to construct and operate fish-rearing facilities and the potential for increasing withdrawals for the effort is unknown. Data are needed on floods, low-flows, and water quality to address these concerns of the Tribe.
Objectives - To provide an assessment of the hydrology relative to the above problems so that the Chehalis Indians will have the information necessary to properly develop, manage, and conserve their water and other natural resources.
Approach - Statistical analyses of streamflow records will be made to determine flood magnitude and frequency. Flood inundation maps will be prepared using the above data plus aerial photographs and field surveys. Wells will be inventoried and observation wells established, 36 holes to test and monitor soil drainage characteristics will be installed, and chemical and biological analyses of water from major streams plus some ponds and wells will be made.