Abstract
<p>Tidal floods are high tides that occur excessively on the mainland. Radial gate weir<br />is a door building that moves around in a cylindrical shape to regulate the water<br />level elevation. This study aims to determine the influence factor of the radial gate<br />movement weir mechanism, analyze the fluid mechanics of the radial gate during<br />tidal flooding. This research is experimental design research, namely, making a<br />prototype design of the radial gate motion weir mechanism and analysis of<br />parameter data in the form of hydrostatic pressure, hydrodynamic pressure, critical<br />flow, and sub critical flow. The conclusion of this study is, the design is planned to<br />work when: the automation system runs because the two proximity sensors touch the<br />30 cm water level, activate the linear actuator to close the radial gate, the water<br />pump turns on and 15 cm opens the radial gate, the water pump stops. The results of<br />parameter data analysis: hydrostatic pressure of water level 30 cm = 32.0 N/m2,<br />hydrodynamic pressure due to earthquake according to (DSI) in Cilacap = 0.1211<br />tf/m2, BMKG SIG (III/Light)= 33,600 tf/m2, (IV/ Medium)= 96.075 tf/m2,<br />(V/Weight)= 148.3125 tf/m2. Critical flow rate of water level is 15 cm = 0.0149<br />m3/second, sub-critical flow rate is 0.0098 m3/second.</p>
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