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PMF Estimation for a Sparsely Gaged Watershed

by Anand Prakash, Chief; Water Resources Engineer and, Associate, Rolling Meadows, United States,
Philip Sherlock, Chief; Water Resources Engineer and, Associate, Rolling Meadows, United States,



Document Type: Proceeding Paper

Part of: Engineering Hydrology

Abstract:

This paper describes a procedure used to determine the design-basis and probable maximum flood (DBF and PMF) for Jiguey Dam located in the Dominican Republic. This dam is situated upstream of another proposed dam (Aguacate), which, in turn, is located upstream of an existing dam (Valdesia) on the same stream. The existing dam (Valdesia) cannot pass the PMF without overtopping. Therefore, an important consideration in sizing the upstream dams and their outlet works has been attenuation of the PMF hydrograph from the basin. Consequently, the DBF for both Jiguey and Aguacate dams is essentially the PMF. In the Dominican Republic, PMF will most likely be caused by hurricane activity. Therefore, hurricane-induced PMP is used to develop the PMF. The duration and time distribution of PMP has been determined based on available mass curves of precipitation for various storms in the region. The estimates of PMP and PMF peaks are compared with the respective enveloping values for observed data, and reasonably conservative design values have been selected by judgment.

Subject Headings: Dams | Rivers and streams | Floods | Watersheds | Hydraulic design | Precipitation | Hydrographs | Dominican Republic | Caribbean

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