Studi pengendalian banjir daerah aliran sungai Pedindang

Dina Wijayanti, (NIM. 1041211018) (2017) Studi pengendalian banjir daerah aliran sungai Pedindang. skripsi thesis, Universitas Bangka Belitung.

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Abstract

The River Basin of Pedindang is a water stream that flows from the Mangkol hill where the left and right side of Pedindang river has been used for tin mining by the local residents. Mining waste is discharged into Pedindang river so that the river water becomes turbid and sedimentation occurs in the downstream area of fish market, which can cause flood especially in the rainy season caused by sedimentation of the tin mining. Not only that, the upstream of Pedindang river which is located in Mangkol hill has decreased the function of the catchment area because of many activities of deforestation which caused the rain water that are falling no longer percolated to the soil and becomes runoff water instead.This study aims to determine the ability of existing river capacity in accommodating flood discharge with river normalization, retention pond and land using modification as an effort to control the flood. Flow profile analysis was performed using the HEC-RAS version 4.1.0 program. In this study, flood control was planned using Q90th flood discharge. The selection of Q design is based on the highest rainfall that occurred before in Pedindang river of 183.90 mm which is equivalent to 90 times repeated year rainfall plan of 183.84 mm so that it got Q90th of 113.59 m3/sec. Normalization is done from the fish market kulong all the way through Pedindang village which is 3.8 km and can reduce the flooding up to 48.42%. The next effort is done by adding 50.6 Ha of retention pond and can reduce the flood by 31.98%. The next attempt to modify the land cover that generates flood discharge of Q90th by 78,67 m3/sec and can reduce the height of floods by 24,12%. After the combination of normalization handling retention ponds and land use controls, Pedindang river is able to accomodate flood discharge with 90 year repeated period and can reduce flooding by 92,31%

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