Difficult Dam Problems — Marginal Spillway Stability

by Charles D. Craddock, (M.ASCE), Asst. Chf.; Engineering Div., Kansas City District, Corps of Engineers, Kansas City, Mo.,

Serial Information: Civil Engineering—ASCE, 1975, Vol. 45, Issue 8, Pg. 66-66

Document Type: Feature article


In l965 the Corps of Engineers began a program of inspection and reevaluation of its older dams to determine if they are satisfactory based on present day standards. The study of the spillway at the Harlan County Dam in Nebraska indicated that although no signs of distress existed in the structure, the stability of the spillway would be marginal for a reservoir at full pool. Studies were made of several remedial measures. The selected approach consisted of an upstream drainage system of nearly horizontal, 3 in. (76 mm) diameter drain holes drilled from the spillway drainage gallery, 200 ft (61 m) into the upstream chalk foundation.

Subject Headings: Dams | Spillways | Rivers and streams | Drainage systems | Inspection | Drop structures | Structural stability | Reservoirs | Nebraska | United States

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