Studi Kolam Retensi sebagai Upaya Pengendalian Banjir Sungai Way Simpur Kelurahan Palapa Kecamatan Tanjung Karang Pusat

Abstract

Flood is one of the natural phenomena that cause huge losses. Population growth led to the need
or increased settlements and land use changes. Rain water infiltration is reduced not only causing
floods but also droughts. Therefore, it is necessary to do environmental insightful flood control,
such as retention pond. This research aims to plan and analyze the effect of making retention pond
for flood control.
This research was conducted in Duana Street, Palapa Urban Village, Tanjung Karang Pusat
District which is flowed by Way Simpur River. In this research, the hydrological analysis made of
rainfall data PH 001 Pahoman Station from 1995 to 2009. After having planned rain discharge,
hydraulics analysis was executed to analyze the discharge capacity of the existing and plan
volume of the storage pond. Calculations of infiltration rate were performed to calculate the
absorbed discharge. Furthermore, storage pond design plan and budget plan were made.
In the analysis made, the value of planned rain discharge for 5 years return period is 5.0617
m 3 /sec. Total capacity of the storage pond is 12,074.1058 m 3 . The time needed by pool from
vacant until full is 29.0202 minutes. Budget plan required in making this retention pond is Rp
1,838,436,742.69. Based on the analysis performed, it was concluded that the retention pond is
effective enough to be used as one of the alternative flood control measures in urban areas.
Keywords : flood, retention pond, flood control.