GRAND COULEE DAM, Wash. -- Federal water and dam managers are draining reservoirs in the Columbia and Snake River basins to get ready for "big water" coursing downriver. In recent weeks, the Army Corps of Engineers has called for bigger drawdowns, or as the agency calls it "drafting", to protect against flooding. Supervisory engineer Peter Brooks says more room is needed to catch runoff from the bountiful snows of March.