Yeri Sutopo, FT Teknik Sipil and Karuniadi Satrio Utomo, - and Naufal Tinov, - (2022) The Effects of Spillway Width, Inflow-Outflow Discharge, and Flow Elevation on Weir Crest. Civil Engineering Journal, 8 (4). ISSN : 2676-6957

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Abstract

The purpose of this study was to analyze the effect of spillway width on flow elevation above weir crest based on the flood discharge design for the Probable Maximum Flood (PMF) return period using flood routing hydrologically at the Cacaban Dam. The rainfall Probable Maximum Precipitation (PMP) design used the Hershfield equation. The design of the flood discharge analysis of QPMF used the Nakayasu Synthetic Unit Hydrograph (HSS). Flood routing used hydrologic routing method. The Cacaban Dam is located in Jati Village, Kedung Banteng District, Tegal Regency, Central Java Province. The results of the research data analysis showed that bigger spillway crest widths led to lower flow heights above the spillway crest, and bigger outflows. Thus, if a large storage volume of the reservoir is intended, then the width of the spillway crest must be reduced. Otherwise, the width of the spillway crest must be increased. In relation to flood control in Tegal Regency, reducing the spillway crest width is preferable.

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