2. present condition of the reservoir 2.1 view of...

The Study on Countermeasures for Sedimentation Final Report in the Wonogiri Multipurpose Dam Reservoir Volume VII: Photo Book

Nippon Koei Co.,Ltd. P-5 July 2007 Yachiyo Engineering Co.,Ltd.

2. PRESENT CONDITION OF THE RESERVOIR

2.1 View of Wonogiri Reservoir (1/3)

Wonogiri dam abutment on the left side of dam Spillway forebay on thet left side of dam

Bank erosion around Wonogiri reservoir. Wonogiri Dam view from chersonese.

An old bridge buried in sediment deposits on confluence of Alang and Solo Rivers

Dry condition of sediment deposits in Wonogiri reservoir





Panoramic view of Wonogiri reservoir (downstream)

Panoramic view of Wonogiri reservoir (upstream)

Panoramic view of sedimentation in front of Wonogiri dam





Outlet of Wonogiri power station. Turbidity current from Keduang River

Dredging around intake structure Inlet of intake structure immediately after construction of the Wonogiri dam

Mt. Lawu located north-east boundary of Wonogiri watershed (view from Surakarta City)

Panoramic view of Wonogiri reservoir on January 14, 2007




2.2 Facilities of Wonogiri Reservoir

Wonogiri power station (PLTA) Spillway gate

Hollow Jet Valve PLTA outlet gate to release water for power generation on September 26, 2005

Intake gate of Wonogiri dam Turbine of Wonogiri power station




2.3 Water Releasing from Wonogiri Dam

Spillout at spillway gate on February, 2006 Spillout at spillway on February, 2006

Spillout at outlet of spillway on February, 2006 Spillout at outlet of spillway on February, 2006

Water release from Hollow Jet Valve on November, 2006

Wonogiri dam spillway gate




2.4 Colo Weir and Wonogiri Irrigation Area(1/2)

Colo weir located 14 km downstream of Wonogiri dam

River bed protection and downstream of Colo weir

Intake structures of Colo weir Sediment flushing gate of Colo weir

Overflowing on Colo weir on January 30, 2006 Intake gate of Colo west main canal on December 24, 2004




2.4 Colo Weir and Wonogiri Irrigation Area (2/2)

Upstream and left sde of Colo weir

Wonogiri west main canal on December 24, 2004

Garbage at intake gate of Colo weir on December 21, 2005

Wonogiri Irrigation area on December 21, 2005 Wonogiri main canal on December 21, 2005




2.5 Sedimentation Survey at Intake

Bathymetric survey at intake on November 11, 2004

Bathymetric survey at intake on November 11, 2004

Experimental setup for bathymetric survey at intake on November 11, 2004

Monitor of eco-sounder for bathymetric survey at intake on November 11, 2004

Sampling of sediment deposit in Wonogiri reservoir

Sediment deposit in Wonogiri reservoir mainly compose of clay and silt




2.6 Tributary of Wonogiri Reservoir (Keduang)

Bed rocks in upper reach of Keduang River Check dam in upper reach of Keduang River

Check dam in Keduang River Middle reach of Keduang River

Lower reach of Keduang River immediately downstream of Keduang Bridge on February 23, 2005

Lower reach of Keduang River inside of Wonogiri reservoir




2.6 Tributary of Wonogiri Reservoir (Tirtomoyo)

Middle reach of Tirtomoyo River immediately downstream of Tirtomoyo Bridge during dry season on September 4, 2004

Middle reach of Tirtomoyo River immediately downstream of Tirtomoyo Bridge during wet season on December 20, 2005

Middle reach of Tirtomoyo River immediately upstream of Tirtomoyo Bridge on February 23, 2005

River condition of lower reach of Tirtomoyo River

Sand mining activity in lower reach of Tirtomoyo River

River mouth of Tirtomoyo River in Wonogiri reservoir




2.6 Tributary of Wonogiri Reservoir (Temon)

Hard soils on river bed in Temon River River condition in middle reach of Temon River

River condition in middle reach of Temon River Bridge on middle reach of Temon River

Panoramic view of sedimentation in Ngachar irrigation dam located in upper reach of Temon River on October, 2004




2.6 Tributary of Wonogiri Reservoir (Solo)

Hard rocks in upper reach of Solo River Hard rocks in upper reach of Solo River

Middle reach of Solo River Sand mining activity on Solo River

Sedimentation at river mouth of Solo River in Wonogiri reservoir

Sedimentation at river mouth of Solo River in Wonogiri reservoir




2.6 Tributary of Wonogiri Reservoir (Alang)

Automatic water level gauging station in Alan River

Visible bank erosion in Alang River

Middle reach of Alang River Visible bank erosion in Alang River

Visible bank erosion in Alang River Visible bank erosion in Alang River




2.7 Upper Solo Mainstream

Jurug Bridge,51.8 km downstream of Wonogiri dam on August 25, 2005

Hard soils in Upper Solo mainstream (Sari Bridge)

Confluence of Solo and Sragen Rivers, 89 km downstream of Wonogiri dam on February 19, 2005

Tangen Bridge 99.4 km downstream of Wonogiri dam

Ngunengon Bridge 162.9 km downstream of Wonogiri dam on February 19, 2005

Confluence of Solo and Madiun Rivers, 200 km downstream of Wonogiri dam on February 19, 2005




2.8 Discharge & SS Concentration Survey

Measurement of flow velocity at Upper Solo River

Sampling of flood water for measurement of SS concentration at Tirtomoyo River

Sampling of flood water for measurement of SS concentration at Upper Solo River

Measurement of water temperature at Upper Solo River

Labeling of sampling date and time on the bottle of collected water at Alang River

Bottles of sampling water in one flood at Tirtomoyo River




2.9 Hydro-meteorological Station(1/2)

Daily and hourly rainfall gauge at Nawangan in Alan River basin on July 26, 2005

Daily and hourly rainfall gauges at Tawangumangu close to Keduwang River basin

Automatic water level gauging station at Jarum, Dengkeng River on July 26, 2005

Rainfall telemetry gauging station at Batuwarno, Temon River on June 4, 2005

Hourly reservoir water level gauge at turbine Inlet, Wonogiri dam on December 20, 2005

Meteorological station at Wonogiri dam on January 4, 2006



2.9 Hydro-meteorological Station(2/2)

Automatic water level gauge at Jurug in Bengawan Solo River managed by PBS on February 4, 2007

Automatic water level gauge at Ngadipiro in Keduang River managed by BP2TPDAS

Automatic water level gauge at Sembukan in Keduang River managed by PBS.

Automatic water level gauge at Duwet in Temon River managed by BP2TPDAS

Automatic water level gauge at Ngrembang in Solo River managed by PBS

Automatic water level gauge at Banaran in Alang River managed by BP2TPDAS




2.10 Garbage Problem

Garbage removal by divers in front of the intake of Wonogiri reservoir on September 26, 2005

Garbage removal by divers in front of the intake of Wonogiri reservoir on September 26, 2005

Garbage removed from the intake: plastic dusts from houses as well as vegetative debris on September 26, 2005

Garbage removed from the intake: plastic net used for fishery in the reservoir on September 26, 2005

Garbage removed from the intake: plastic dusts from houses as well as vegetative debris on February 1, 2007

Garbage removal work by backhoe at the intake on January, 2004




2.11 Water and Bed Material Quality Analysis

Discharge measurement at Tirtomoyo River on May 2005

Discharge measurement at West Canal of Colo weir on December 2004

Water sampling at Keduang River on December 2004

Bed material sampling for environmental study in Wonogiri Reservoir on May 2005

Sampled bed material at Alang River on December, 2004

Field analysis of basic parameters near sampling location in Upper Solo on May 2005




2.12 Periodic Water Quality Monitoring

Measurement of water depth in Wonogiri reservoir on December 7, 2004

Sampling of surface water upstream of Colo Weir for TSS (Total Suspended Solids) analysis on December 7, 2004

Equipment for sampling of suspended sediment in Wonogiri Reservoir

Measurement of water temperature and DO (Dissolved Oxygen) in Wonogiri Reservoir on January 4, 2005

Sampled water taken from the reservoir from 0 (surface) to 10m in depth

Turbidity meter used for field measurement

2. present condition of the reservoir 2.1 view of...

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