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The Kansas Department of Transportation has proposed replacing a bridge over the Kansas River on State Highway 99, at Wamego, Kansas. This report evaluates the ability of the main channel along with the existing agricultural levee to contain the flow of the Kansas River, the effect of overflow structures under the highway south of the bridge, and the effect of an island upstream from the proposed bridge. The design of the proposed new bridge is adequate for passage of a 100-year flood of 155,000 cubic feet per second; however, the existing levee along the right bank of the river upstream of the proposed bridge will not confine the flow to the main channel because parts of the levee have been broken or removed. The present overflow structures would allow a discharge of 26,000 cubic feet per second to occur in the bypass reach with a maximum depth of flow over the highway of 1.3 feet. If the structures were removed but the highway grade maintained, the discharge would increase to about 30,000 cubic feet per second with a depth of flow over the highway of 1.5 feet. If the overflow structures were removed and the elevated sections of the highway grade leveled, the discharge would increase to about 31,500 cubic feet per second, with a maximum depth of flow over the highway of 1.3 feet. The velocity of flow through four 30-inch-diameter concrete culverts located at overflow-structure sites would be 8.6 feet per second. Foreseeable changes in the island upstream from the proposed bridge would not interfere with the flow capacity of the new bridge.

Floodflow characteristics at proposed bridge site for State Highway 99, Kansas River at Wamego, Kansas