Asian Water Cycle Symposium 2016
Tokyo, Japan, 1 - 2 March 2016
Jasa Tirta Public Corporationhttp://www.jasatirta1.co.id
FLOOD MANAGEMENT IN TOBA ASAHAN AND JRATUNSELUNA RIVER BASINS,
INDONESIA
DONY TRIO PRABOWO & FAHMI HIDAYAT
Toba Asahan Basin
±7,225.45 km2
2 main sub basin
Jratunseluna Basin
9.576,01 km²
69 sub basin
3 main sub basin
LOCATION MAP
A.Asahan
A. Sa
kur
A. Taru
m
S. Masihi
S. Hessa
A. K
u ais
A. La
utan
S. Ba
ndar Jepang
A. Ponot
S. Teluk
A. G
u ya ng an
A. Kapak
S. Kapu as Batu
S. Ha
ji Daud
S. L
eba h
S. Bandar Jaksa
S. P
emb an g
u nan
S. Pekahilan
A. Perga
mbiran
A. B
aturang in
A. S
ugapa
A. Loplopan
S. Kapias Kiri
A. Tandonan
S. A
i r Putih
A. Tam
bus
S. Sukaraja
DAS SilauDAS Asahan
DAS Danau Toba
Kabupaten Asahan
Kabupaten Toba Samosir
Kota Tanjung Balai
Regulate stabilty of Lake Toba water elevation
intp Asahan River also contribute on water
allocation into Sigura-gura Dam.
Asahan I 2×90 MW (1147 GWh/th)
managed by PLN Corp.
SIRUAR DAM
SIGURA-GURA DAM
286 MW (1868 GWh/th) Managed
by Inalum Corp.
DA S D an au Toba
DAS A sah an
DA S S ilau
DA S P ias a
Samudera Indonesia
Selat Malaka
DA S D an au Toba
DAS A sah an
DA S S ilau
DA S P ias a
Samudera Indonesia
Selat Malaka
KEY PLAN
Asahan III Water Power Plant
constructred by PLN which will
be operate in 2016 with installed
capacity 2×87 MW (1033 GWh/th)
SILAU SUB-
WATERSHED
DANAU TOBA
WATERSHED
ASAHAN SUB-
WATERSHED
TANGGA DAM
223 MW (2100 GWh/th) Managed
by Inalum Corp
INFRASTRUCTURE IN THE ASAHAN RIVERBendung DI Padang Mahondang (3233 ha)
Bendung DI Sei Lebah (600 ha)
Bendung DI Sipaku Area (50 ha)
INFRASTRUCTURE IN THE SILAU
RIVERBendung DI Sijambi (1013 ha)
Bendung DI Sei Silau (1315 ha)
Bendung DI Silau Maraja (530 ha)
Bendung DI Setia Budi (128 ha)
Bendung DI Silau Tua Blok 40 (40 ha)
Bendung DI Terusan Tengah (360 ha)
Bendung DI Serbangan (2333 ha)
Bendung DI Sei Beluru (350 ha)
Bendung DI Sei Serani (150 ha)
Bendung DI Panca Arga (2500 ha)
Bendung DI Tasik Malaya (1000 ha)
Bendung DI Suka Ramai (281 ha)
Bendung DI Sei Balai (1185 ha)
Bendung DI Serba Jadi (833 ha)
Bendung DI Laut Tador (60 ha)
Bendung DI Repelita (270 ha)
Flood in Toba Asahan River Basin
• Frequent floods take place in Tanjung Balai City, which is
located on lower reach of the Asahan River, at the confluence of
the Asahan River and the Silau River.
• The floods caused by large discharge from upstream (outflow of
Siguragura Dam & Tangga Dam reservoirs) and inflow of Silau
River.
• Siguragura Dam & Tangga Dam operations based on the
electricity demand for alumunium smelting operation.
• The flood prone areas are Districts of Datuk Bandar, Datuk
Bandar Timur, Buntu Pane, Rahuning, Tinggi Raja, with the
floods level about 10 - 70 cm.
FLOODS DISASTER AFFECTED AREA
Flood inundatet the Parliament
Office of Tanjung Balai City
Flood inundated residential areas in Datuk Bandar
District
Floods in Lower Reach of Asahan River Basin
Flood Management in Asahan River Basin
• Need to promote the balance between the electricity
production and the river capacity on lower reach,
according to IWRM concept.
• As the structural measures, it’s necessary to develop an
afterbay infrastructure in the downstream which serves
to flatten the discharge from upstream reservoirs
(Siguragura & Tangga Dam Reservoirs). The Ministry of
Public Works, Government of Indonesia plans to
construct levee (26km long and 18m wide).
• As the non structural measures, it’s necessary to
develop flood hazard mapping with land use and building
controls in flood-prone areas and develop flood
forecasting and warning systems, backed up by
improved communication systems and community
awareness programs.
Jatibarang Dam
JRATUNSELUNA RIVER BASIN
Flood in Jratunseluna River Basin
• Frequent flood in Jratunseluna River basin affect
Semarang City, the capital of Central Java
Province, with the population of 1.765.386
inhabitants.
• The geographic condition of the North Coast of
Semarang City with a slope about 0 – 20, land
subsidence, high water tide, and inadequate
structural measures cause frequent coastal
flooding in the city.
COASTAL FLOOD (ROB) AFFECTED AREA
Coastal Flood (ROB) in the North Outer
Ring Road , Semarang City.
Flood in the Beringin River on the North Coast
(Kendal District – Semarang)
• Structural and non-structural methods for controlling
coastal flooding including dykes, drainage systems,
pump stations, polder systems, coastal-land
reclamations, coastal planning and management,
public education, as well as the establishment of an
institutional framework for disaster management have
been implemented in the coastal area of Semarang
City.
• Some improvement actions have been proposed
including stakeholders involvement on the disaster
mitigation. For a long period coastal management,
accelerated sea level rises due to global warming
should also be taken into account.
Flood Management in Jratunseluna River Basin
C. COMPONENT
• Rehabilitation of Drainage
System of Semarang River
• Rehabilitation of Drainage
System of Asin River
• Rehabilitation of Drainage
System of Baru River
B. COMPONENT
Construction of Jatibarang Dam
A. COMPONENT
• Channel Widening
• Revetment
• Increasing floodwall
• Dredging
• River Normalization
• Simongan Dam Rehablitation
INTEGRATED WATER RESOURCES AND FLOOD MANAGEMENT PROJECT FOR SEMARANG CITY
Community Based Flood Early Warning System
