2. PRESENT CONDITION OF THE RESERVOIR 2.1 View of Wonogiri Reservoir (1/3)

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1 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 Nippon Koei Co.,Ltd. P-5 July 2007

2 2.1 View of Wonogiri Reservoir (2/3) Panoramic view of Wonogiri reservoir (downstream) Panoramic view of Wonogiri reservoir (upstream) Panoramic view of sedimentation in front of Wonogiri dam Nippon Koei Co.,Ltd. P-6 July 2007

3 2.1 View of Wonogiri Reservoir (3/3) 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 Nippon Koei Co.,Ltd. P-7 July 2007

4 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 Nippon Koei Co.,Ltd. P-8 July 2007

5 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 Nippon Koei Co.,Ltd. P-9 July 2007

6 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 Nippon Koei Co.,Ltd. P-10 July 2007

7 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 Nippon Koei Co.,Ltd. P-11 July 2007

8 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 Nippon Koei Co.,Ltd. P-12 July 2007

9 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 Nippon Koei Co.,Ltd. P-13 July 2007

10 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 Nippon Koei Co.,Ltd. P-14 July 2007

11 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 Nippon Koei Co.,Ltd. P-15 July 2007

12 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 Nippon Koei Co.,Ltd. P-16 July 2007

13 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 Nippon Koei Co.,Ltd. P-17 July 2007

14 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 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 Nippon Koei Co.,Ltd. P-18 July 2007

15 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 Nippon Koei Co.,Ltd. P-19 July 2007

16 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 Nippon Koei Co.,Ltd. P-20 July 2007

17 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 Nippon Koei Co.,Ltd. P-21 July 2007

18 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 Nippon Koei Co.,Ltd. P-22 July 2007

19 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 Nippon Koei Co.,Ltd. P-23 July 2007

20 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 Nippon Koei Co.,Ltd. P-24 July 2007

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