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Energy dissipation of water flow is an important factor in the planning of structures such as stilling basins. One of the standards set by the USBR (United States Bureau of Reclamation) that must be considered in the planning of the stilling basin is the Froude number (F1) at the toe of the spillway. Various forms of planning can be used to meet these standards, one of which is by using a double-sill downstream of the chute channel with a certain distance and height. However, as an alternative to planning, this study aims to evaluate the level of attenuation of flow energy in a stilling basin by using a double-sill. Because this sill is more effective in breaking down and reducing the strength of the water flow. Hydraulic physical model tests were carried out in the laboratory by placing double sills in a fixed position and varying the height of the sills. Because several previous studies have shown that the shape and size of sills affect the level of energy dissipation. It is expected that the results of the hydraulic model test can provide better information about the flow behavior in the overflow system in terms of energy dissipation. [ABSTRACT FROM AUTHOR]

The main building in an irrigation network building can be defined as a building complex along the river where buildings can divert water to an irrigation channel so that the water can be used for irrigation purposes. If a weir is built, a water jump will occur downstream of the weir. The speed in the area is still high so that a construction of energy absorbers is made. Energy reducer is a hydraulic building which built to reduce energy of water that caused from the runoff of the top of the dam lighthouse. The construction of energy absorbers has several types including the type of Vlughter, Schoklitsch, Bucket, USBR, and The SAF Stilling Basin. In this study, the type of USBR II energy reducer is used, which is an energy reducer which has sharp channel blocks (dispersing teeth) at the upstream end and near the end of the downstream (end sill) and this type is suitable for flow with hydrostatic pressure greater than 60 m. The purpose of this study is to efficiently the model of energy absorbers by modifying the reduction the elevation in the energy absorbing floor type USBR II. This research was conducted at the Laboratory of River and Swamp, Water Resources Engineering, Faculty of Engineering, University of Brawijaya Indonesia by testing the physical model in accordance with the design work of South Borneo Kambat Dam, with a physical model of open channels with a width of 40 cm, fixed base, scalatic and using clean water. [ABSTRACT FROM AUTHOR]