Report on River Bank Protection Study, Wapello, Iowa, 1975

(1975) Report on River Bank Protection Study, Wapello, Iowa, 1975. Natural Resources, Department of

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Abstract

The study included investigation of seepage forces due to internal flowing groundwater. Seepage forces were initially considered to be a 1ikely cause of bank failure, but were found to be insignificant in causing a slide near Jackson Street which occurred during our study. The medium sand layer found beneath the clay zone may be exposed at one particularly deep point of the river channel. This layer had piezometric gradients of about .002, insufficient to cause quicksand conditions as water escapes vertically through the sand into the river. However, more adverse seepage pressures could be present under more extreme climatic and river level fluctuations. This possibility has been considered in preliminary design of the recommended project.