The hydraulics analysis of the USBR stilling basin type of a dam under multiple flow discharge scenarios (A case study of Temef Dam, East Nusa Tenggara, Indonesia)

• Published in: IOP conference series. Earth and environmental science 2021-04, Vol.724 (1), p.12043
• Main Authors: Widiarti, W Y, Wiyono, R U A, Laksono, N J T, Wahyuni, S
• Format: Article
• Language: English
• Subjects: 100 year floods; Climate change; Dam construction; Dam engineering; Damage prevention; Dams; Discharge; Flood hydrographs; Flooding; Floods; Fluid dynamics; Fluid flow; Hydraulic structures; Hydraulics; Indentation; Irrigation water; Spillways; Stilling basins; Water resources; Water supply
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/724/1/012043

Temef Dam was built to meet the needs of water supply and irrigation. Climate change and dam construction exaggerate security issues related to water resources. One important part of dam construction is the stilling basin, which can dissipate the energy from the discharge of the spillway and preserve the dam from flooding and degradation. The purpose of this study was to determine the most appropriate USBR stilling basin type under multiple flow discharge scenarios. The analysis involved 1) determining the designed flood hydrograph and 2) hydraulic analysis to select the USBR stilling basin. The study results showed that 1) analysis of the designed flood hydrograph for a 100-year return period up to the PMF showed values from 890 m 3 /second to 4300 m 3 /second and 2) the appropriate stilling basin is a USBR Type II. The results also presented detailed hydraulic structure calculations (stilling basin length = 47 m, stilling basin wall height = 15 m, steep channel blocks = 14 pieces, and indentation blocks = 9 pieces). This study is very useful because the right design will be able to ensure the smooth operation of the dam and prevent the dam from damage.