Abstract
The United States Department of Agricultural (USDA) Natural Resources Conservation Service (NRCS) has financially and technically assisted with the construction of nearly 11,000 small watershed dams in the U.S. By 2017, half of these structures will reach the end of their planned service life due to age, and others will need rehabilitation prematurely due to hazard classification changes as a result of urbanization and alterations in land use and topography. In many cases, spillways have inadequate spillway capacities. Approximately 10% of the 11,000 NRCS assisted structures are expected to have roller compacted concrete (RCC) stepped spillways to increase the spillway capacity of the existing structure. Typical RCC stepped spillways for NRCS applications will be constructed on existing embankments where the downstream embankment face slope ranges from 2(H):1(V) to 4(H):1(V). Literature in this realm of stepped spillways is very limited.
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