Page - 439 - in Book of Full Papers - Symposium Hydro Engineering

the tasks of the institutions and proves the existence of public-private partnership and division of roles in the partnership (table 1). Table 1 Dam Management Management Dam Operation BBWS Serayu Opak (National Government-Ministry of Public Works and Housing) Energy Operation Indonesian Power (Private Company) Water Supply Operation PDAM (Local Government Owned Company) Irrigation Operation Balai PSDA Probolo (Local Government) Catchment Management BPDAS Serayu Opak Progo (National Government-Ministry of Forestry and Environment) 3.2. DAM CONDITION As a summary, table 2 shows the comparison of the dams’ data for the dam catchment and sedimentation condition. Table 2 Data for catchment and sedimentation for Sempor and Wadaslintang Data Sempor Wadaslintang Maps of Catchment Green Belt (9) Slope catchment (10) Catchment Area 43 km2 (9) 196 km2 (11) Land use of catchment 42% for agriculture (9) 21% for agriculture, forest, etc. Sedimentation rate 419,914 m3/year (2011) (1) 711,247 m3/year (2008) (12) Catchment slope 25 – 50 o (1) 5-55 o (10) Aside from the change of land use in the upstream catchment, the climate change impacts also cause the change of average precipitation for both dams. These precipitations increase the potential of sedimentation to the dam since the catchment of the dam is not fully forested, and many parts are used as agricultural lands for seasonal cropping pattern (vegetables). The data (figure 2) is showing increased intensities confirming the research on climate change impact to Indonesian island laying below the equator (3): where a higher intensity of rain happens. 439