The Impact of Changing Storage Area on Flood Magnitude and Occurrence
Abstract: This study focuses
on the impact of combined catchment and storage upon flood occurrences and
flood peaks. A significant factor that plays an important role of the combined
catchment and storage is the ratio of contributing catchment area to storage
area (AC/AS) where the impact significantly shows increasing frequency of
storage overflow and flood peaks with the increasing of AC/AS. Some case
studies examined in this work, i.e. Way Pegadungan (Lampung, Sumatra) and
NagaraRiver (South Kalimantan) catchments show similar behavior. Swamps located
on the sides of downstream of Way Pegadungan as well as Nagara River act as
storages during flood events. The dyke which was planned to be built increases
the ratio of AC/AS significantly as storage area reduced considerably. This has
an impact on flood peaks which can increase considerably. The improved
understanding of these process controls will be useful in assisting the
management of such catchments, particularly to assist in flood prevention and
mitigation.
Author: Kusumastuti, D.I.
Journal Code: jptsipilgg120022
