Bumping Reservoir Review

Project Summaries


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WA237 - River of Water and Power Resources Service (WPRS) Water-Supply Analysis for Proposed Enlargement of Bumping Reservoir - Completed FY1980

Problem - Citizens for Responsible Water Projects contend that the water-supply analysis made by Water and Power Resources Service (WPRS) for enlargement of Bumping Reservoir is inadequate; specifically, that the assumption of a full reservoir beginning in 1926 produces misleading results and incorrect conclusions. Water Resources Division (WRD) Tacoma has been instructed by the Director to make a simplistic reanalysis of the WPRS' data using the same general assumptions as used by WPRS.

Objectives - We will review the water-supply analysis for the proposed enlargement of Bumping Reservoir, as described in pertinent WPRS reports, by comparing WRD computations of month-end contents with those computed by the WPRS.

Approach -

Read the four pertinent WPRS reports and define the operational assumptions and flow requirements used by WPRS;
Compute month-end contents through 1978 for an enlarged reservoir, using simple values of monthly runoff in acre-feet published in WRD reports and the same starting conditions (full reservoir), water-right diversions, instream flows, supplemental diversions, and rule curves assumed by WPRS;
If the results of WRD and WPRS computations agree, then reanalyze month-end contents using different starting conditions and report these results; and
If the results of WRD and WPRS computations disagree, then reanalyze month-end contents using different supplemental diversions and report these results.