JASA TIRTA I PUBLIC CORPORATION INDONESIAa.

An outline of your organization
Jasa Tirta Public Corporation was established as a state-owned company with aspecified concensus in rendering water services and performing O&M activities basedon water service fee abstracted from the users. The corporation was established under
the Government Regulation No. 5 of 1990. To adapt further to the responsibilites andassignments, the regulating basis of Jasa Tirta I Public Corporation (PJT I) was twiceammended. Firstly, in 1999, by the Government Regulation No. 93 of 1999, in order tostrengthen the organization and permit its jurisdiction to extend to other basins; andrecently by the Government Regulation No. 46 of 2010.
The objective and goal of PJT I is take part and support the Government policy andprogram on economic sector and national development in general, and particularly on
business of water resources and its management, as well as optimization of PJT I’s
resources to produce goods and services based on healthy corporation management
principles.
In order to achieve the objective and goal, PJT I conducts main business activities: (1)services to provide bulk water for drinking water, industry, agriculture, flushing, port,electric power generation and others; (2) provide water power to generate electricity for
the State Electricity Company; (3) generate and distribute electric power and drinking
water, perform consulting in water resources fields, heavy equipment rental and water
quality laboratory services, and (4) develop other water-related services including piped
domestic supply at specified scales.
PJT I in-charged in managing the water resources in 40 rivers (including the Brantas
River) of the Brantas River Basin and to operate, maintaining, and managing the major
infrastructure in these rivers. In 2000, the corporation was authorized to undertakewater resources management activities within 25 rivers of the Bengawan Solo River
Basin (an inter-provincial river basin lying in Central and East Java Provinces). In 2014
the corporation was authorized to undertake water resources management activities
including controlling of water destructive forces, in Serayu Bogowonto and Jratunseluna
River Basins in Central Java and Toba Asahan River Basin in North Sumatera.

Besides the tasks and responsibilities mentioned above, PJT I also conducts excellentand adequate public utilization of water resources to fulfill people needs for social
services, welfare and safety of the public within the working area of the corporation.
Those includes providing surface water supply to fulfill daily basic needs, providing
irrigation water for public agriculture within the existing irrigation system, controlling
flood hazards, conducting water resources conservation and performing thedevelopment of Drinking Water Supply System and sanitation for domestic.
PJT I however has no policy power in areas of enforcement, basin planning, basin
infrastructure development and investment for public services, off-stream water quality
improvement, tariff fixing. In these areas where it is not permitted to make policy
decisions, the corporation works through the administrative and consultative channel toinfluence decisions. As a River Basin Organization, PJT I has to be an accountable andeffective organization in most aspects of the water resources management process,coordination, improving resource base, and working with other agencies andstakeholders by adopting a proactive management style and having a good working
relationship with both formal and informal institutions.
1b.

A summary of your organization’s most important recent research achievements
explaining how those research achievement connect back to actual disaster risk
reduction goals.

1.

Research on the Formulation of Roadmap for Sediment Management in theBrantas River Basin in 2015-2019a)

Objective of the research˗ to promote water and reservoir conservation for optimum reservoir and water
utilization to meet water demand.
˗ to improve environment capacity and to reduce disaster risk in accordance withthe policy of national and provincial government on development.

b) Goal of the research
The roadmap will become guideline for river basin organization, Central,Provincial and Local Governments, concerned agencies and community inconducting sediment management in the Brantas River Basin.
c)

Scope of the research˗ Studying reservoir sedimentation process that includes changes in reservoir
capacity, the volume of sediment, reservoirs bed elevation changes of andsediment grain size.
˗ Studying and evaluating reservoir sedimentation management activities thathave been carried out which includes sediment and soil erosion control,
dredging reservoirs, and flushing.
˗ Evaluating the earlier studies related to the management of reservoirsedimentation.
˗ Studying the reservoir sediment balance, profit and loss of reservoir dredging
and flushing, and its impacts.
˗ Develop sediment management program implementation for a period of 5 years
to come.

d) Summary
Prior to the water resources development took place in the Brantas River Basin,
flood disaster occurred every year in the basin due to riverbed agradation caused byvolcanic eruptions. The First Master Plan prepared in 1961, emphasized on floodcontrol by developing dams at the upper reaches and river improvements in themiddle and lower reaches to increase flood relief capacity. Because of a large
amount of sediment inflow and sedimentation problem, the principal reservoirs inthe basin are rapidly losing their gross storage capacities, ranging from 30 to 50
percent of the original storage capacities. In some of smaller reservoirs, such as theSengguruh, Wlingi and Lodoyo Reservoirs, their effective storage capacities werereduced to around 60% of original capacity. The largest Sutami Reservoir had alarge-scale storage loss in the past 31 years since its construction. The decrease ofreservoirs’ capacity has diminished the function of reservoirs to control flood.
Therefore the flood disaster risk will increase in the Brantas River Basin asincreases in magnitude and frequency of extreme events are already being observedin the basin. Figure 1 depicts the damages due to flashflood in the Lower of Konto
River, a tributary of Brantas River in 2006.
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Figure 1 - The Damages Due to Flashflood in the Lower of Konto River in 2006
The roadmap contains sediment management plan activities in each reservoir andits catchment area which includes: 1) catchment management plan (vegetativeconservation and structural measures, 2) river channel management plan (sabo dam
construction and rehabilitation), 3) reservoir sedimentation management (sedimentdredging and flushing), and 4) monitoring and evaluation plan.
2.

Study on Countermeasures for Sedimentation in Selorejo Reservoir Using Sabo
Technology in Konto Rivera)

Objective and goal of the study
This study is intended to determine the implementation of appropriate sabotechnology in the Konto River, one of the main tributaries of the Brantas River.
The goal is to plan the typical design of sediment control structures corresponding
to the situation in the Konto River and to analysis the stability of sediment control
structures built across the Konto River.

b) Scope of the study˗ Studying the literatures related to sabo structure planning and construction, andsedimentation rate in the Selorejo Reservoir.
˗ Collecting the data for sabo hydraulic structure planning and construction.
˗ Planning and constructing sabo hydraulic structure according to National
Standard (SNI 2815: 2004).
c)

Summary
The study recommends closed type sabo (conventional sabo) with consideration of
the results from laboratory test on sediment grain gradation. A new 6 m high closed
type sabo with the capacity of 15,494 m3 should be constructed at P6 cross section
located in Lebaksari Village, Pujon District, Malang Regency. The study provided
recommendations to monitor sediment transport, to review the geologicalconditions, and to have hydraulic model test.
3c.

A summary of what your organization sees as the major research challenges forthe future
The number, scale and cost of water related disasters are increasing nowadays. Manywater related disaster hazards are becoming more frequent as a result of climate change.
In the Brantas River basin, one of our organization’s working areas, increases inmagnitude and frequency of extreme events are already being observed. The increased
extreme rainfall causes increased flood risk in the basin. In the late December 2007
until early January 2008, persistent heavy rains took place throughout Indonesia and led
to flooding and landslides. Figure 2 shows rainfall totals from the Tropical Rainfall
Measuring Mission (TRMM) based, near-real-time, multi-satellite Precipitation
Analysis (MPA) produced at NASA’s Goddard Space Flight Center for December 24,
2007 to January 2, 2008. The highest rainfall totals for the period (shown in dark red)
were over 250 millimeters (about 10 inches). Although the highest amounts were overwater, parts of Java received in excess of 6 to 8 inches (orange and red areas) (NASAEarth Observatory, 2008).

Figure 1 Rainfall Totals in Some Parts of Indonesia from the TRMM-based for
December 24, 2007 to January 2, 2008 (Source: NASA Earth Observatory)
There is also a significant changing of hydrological pattern in Brantas River Basin. The
average intensity of 50-100 mm daily rainfall in the Sutami-Lahor Catchment Areaduring 1955 - 1989 is 6.5 times, with maximum of 12 in 1970. During 1990 - 2011, theaverage daily rainfall increase 12.5 times with maximum of 21 in 1998. For averageintensity of daily rainfall > 100 mm during 1955 - 1989 is 0.6, with maximum of 2 in
1987, during 1990 - 2011, is 2.1 with maximum of 4 in 2007. The average frequency ofdaily rainfall per year during 1955 - 1989 is 100 days with maximum of 143 days in1970. During 1990 - 2011, the average becomes increase with 146 days daily rainfall
per year, with maximum of 193 days in 1998.
Important information provided by JICA Study in 2014 on the Project for Assessing
and Integrating Climate Change Impacts into the Water Resources Management Planfor Brantas and Musi River Basins. The study has provided preliminary analysis ofclimate change impacts in Brantas and Musi River Basins, Indonesia. The study reveals
4that in the Brantas River basin, all GCMs predicts the air temperature will rise about
1,50C towards future, causing annual rainfall will be increase slightly in whole area,and intensity of the extreme rainfall will be stronger about 1.1 - 1.2 times of present.

Figure 4 Changes in rainfall frequency in the Brantas River basin (JICA, 2014)
From the case in the Brantas River Basin, for the future, our organization still sees thedifficulty to relate the observed data (both from land and sattelite), climate change
projection and mitigation measures during the extreme events take place. Therefore we
consider that the impact of climate change on disaster risk management is the major
challenge of future research on water related disaster risk reduction.

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