Forum Geografi
Vol 34, No 2 (2020): December 2020

Using Hydrological Mapping to Evaluate the Effectiveness of the Bener Dam Development in Reducing Flood Risk in Purworejo Regency, Central Java

Sudaryatno Sudaryatno (Faculty of Geography Universitas Gadjah Mada)
Bagus Wiratmoko (Kementerian Agraria Tata Ruang Badan Pertanahan Nasional)
Winanda Winanda (Faculty of Geography Universitas Gadjah Mada)
Shelly Yeni Saputri (Faculty of Geography Universitas Gadjah Mada)



Article Info

Publish Date
11 Nov 2020

Abstract

The Bogowonto Hulu sub-watershed has high flooding potential, especially during the rainy season. This flooding causes physical, social, and economic losses for the local community and so the Bener Dam was built to reduce the volume of flooding in the area. This research aims to find out the effectiveness of the Bener Dam in overcoming the problem of flooding around the Bogowonto Hulu sub-watershed. The effectiveness of dams can be analysed by comparing the volume of the dam reservoir with the peak discharge amount generated. The value of peak discharge can be obtained using remote-sensing data and mathematical calculations following the rational method. Using this method, the estimated peak discharge value obtained for the watershed was 302.3 m3/s while the value of dam capacity was only 210 m3/s, giving 92.3 m3/s of flooding potential. It is necessary to reduce the potential for flooding by building an IR reservoir in the catchment area, so that rainwater is accommodated rather than being immediately depleted, and to reduce concentration time.

Copyrights © 2020






Journal Info

Abbrev

FG

Publisher

Subject

Earth & Planetary Sciences

Description

Forum Geografi, Indonesian Journal of Spatial and Regional Analysis (For. Geo) is an open access, peer-reviewed journal that will consider any original scientific article for expanding the field of geography. The journal publishes articles in both physical and human geography specialties of interest ...