The Brochure [1.5MB]
Total Page:16
File Type:pdf, Size:1020Kb
Overview of the IWAYA Dam project Specifications The Iwaya dam, as a comprehensive development project, plays an important role on flood control in Kisogawa River system, as well as is used for irrigation, water supply for domestic and industrial use and hydropower (Chubu Electric Power Co.). In 1969, the project was inherited by Water Resources Development Public Corpora- tion from the Construction Ministry and the construction was performed by Chubu Electric Power Co. After the completion of construction in 1976, Japan Water Agency has been responsible for its management. SpecificationsSpecifications ofof ReservoirReservoir Location Kanayama Town and Gero Maze, Gero City, Gifu Prefecture Catchment Area (Direct:264.9㎢) (Indirect:770.0㎢) Total Capacity 173,500,000㎥ Effective Capacity 150,000,000 ㎥ Sedimentation Capacity 13,800,000 ㎥ Dead Storage Capacity 9,700,000 ㎥ Flood Control Capacity 50,000,000 ㎥ Water Utilization Capacity 61,900,000 ㎥ SSpecificationspecifications ooff DamDam Location Unogen and Onbara, Kanayama Town, Gero City, Gifu Prefecture River Maze river of Kiso River water system Type Tilt impervious core type rock-fill dam Elevation of Crest EL427.50m Height 127.5m Length 366.0m Width of Crest 10.0m Volume of embankment 5,780,000㎥ Spillway capacity 2,400㎥/s Dam Structure Embankment Standard Cross-section Surcharge water level Crest Plan Normal water level Lowest water level Rock zone I Filter Filter High water level of Rock zone I Masegawa No.2 Dam Dumped soil Rock zone II Rock zone II Rock Core Rock Intake tower Longitudinal Section Left Right Crest elevation road Spillway Crest length Surcharge water level Normal water level Margin height of Vertical shaft Surcharge Crest of spillway embankment water utilization Right bank tunnel discharge pipe Left bank tunnel Lowest water level Tunnel of No.2 water channel water No.2 of Tunnel water utilization discharge channel water No.1 of Tunnel Inspection tunnel pipe chamber Crest length Inspection tunnel Crest elevation dam of Height elevator Dam office Underground power house No.1 penstock No.1 Drain gallery No.2 penstock No.2 No.1 penstock No.1 No.2 penstock No.2 drainage Intake tower Elevation drainage No.2 temporary No.2 No.1 temporary No.1 SelectiveSelective intakeintake equipmentequipment Grout Gallery Surcharge water level Intake tower : Sub-water intake and surface water intake Type : vertical multistage roller gate Spillway 2 tailrace pipes (Power generation) Outdoor switching station No.2 temporary drainage temporary No.2 No.1 temporary drainage temporary No.1 Normal water level Water utilization pipe attached on one of tailrace pipes Maximum intake water capacity : 335 diversion channel diversion surface water intake EEquipmentquipment forfor flfloodood ddischargeischarge multistage roller gate Crest gate Type : Radial gate Power Outlet screen house High Width 2 gate Maximum outflow discharge Spillway channel Type : Open channel type Lowest water level Crest elevation of spillway : EL406.80 Access tunnel of power house Replaced Prefecture Road Water Channel length 364.33m Access road Lower part of roller gate Water Channel width 21.81m~13.50 WWaterater uutilizationtilization ddischargeischarge gategate Water utilization discharge gate Type : Jet flow gate 1 gate Maximum highwater flow : 83.11 Purposes of the dam Flood Control New water supply The flood regulation for Kiso River is cutting basic high water flow rate of 16000 m3 / sec Details of new water supply A new water supply capacity of Unit by 3500 m3 / sec at Inuyama reference point, which is achieved by regulations of Iwaya Irrigation Domestic Industrial maximum 45.69m3 is yielded and Area supplied Total (agriculture) water supply water supply Dam, Agigawa Dam and Misogawa Dam respectively. Iwaya Dam is planned to cut the plan using for irrigation, domestic and Aichi Pref. high water flow rate of 2400 m3 / sec by 2100 m3 / sec. industrial water supply in the area of Reservoir water level of Iwaya dam is lowered 13m from normal maximum water level to Aichi, Gifu, and Mie Prefecture and Gifu Pref. ensure a flood regulation capacity of 50 million m3 which is about 30% of the total storage Nagoya City. The allocation of water Mie Pref. capacity. quantity is shown as the right table. Nagoya City Image of plan high water flow allocation Total Misogawa Dam Note : The maximum capacities are shown for irrigation and domestic supply. Gifu Agriculture Aichi Hida River 6.13 IWAYA Dam Agigawa Dam Domestic Gifu Maze River Mie Industrial water water supply Mie supply Maruyama Dam Gifu Nagoya City Aichi Inuyama point Power Generation Kiso River Maze Gawa No.1 and No.2 power plant, one sits in the underground on the right bank and another downstream of the dam respectively, brings the maximum generation capacity of 288 megawatts and 66.4 megawatts respectively. Iwaya Dam flood control plan Image of allocation of the storage capacity of Iwaya Dam flow Surcharge water level rate Flood control capacity Normal water level Power and water supply capacity water supply Design flood hydrograph (inflow) Lowest water level Height of dam amount to be controlled Design outflow discharge Sediment and dead water Bedrock Time Hydrographic Map and Beneficiary Area Map of the Dam Indirect catchment area Hydrographic Map Beneficiary Area Map Direct catchment area Gifu Prefecture Higashiueda dam Iwaya Dam Yugake dam Nishimura dam Aichi Prefecture Iwaya Dam Mazegawa No.2 Dam Mie Prefecture Ofunato Dam Legend Direct Domestic catchment basin water supply Highway Indirect Industrial Main road catchment basin water supply Flooded basin Agricultural water supply Dam Management There are three types of operation in the dam management; they are flood control operation, low water operation, and facility management. These operations are carried out according to respective operation rules or management provisions Collection of meteorological Operator console and hydrological information Investigation of water quality Prediction of inflow amount Provision of meteorological Control room and hydrological information Maintenance and inspection of facilities Inspect of Consultations with discharge equipment related organizations Maintenance and Report to related improvement work organizations Release of supplied water Verification, documentation Patrolling and discharge and report warning in the downstream Investigation of water quality Discharge start Low water Observation of displacement Flood Control of dam body operation Operation Patrolling of the reservoir Flood control Improvement of environment Measuring leakage Completing of Patrolling of the reservoir Administration (inside of Inspection tunnel) flood control Public affairs Facility operation Operation facilities Communication equipment Control facility Warning apparatus Power facilities Boats and other equipment Multiplex wireless equipment Dam operation control system Power receiving Patrol boat and workboat Water discharge warning system equipment Telemeter observation equipment Water discharge warning station Warning vehicle Data transmitting device Preliminary power Elevator generation Driftwood stopping facility equipment Mazegawa sediment storage dam Driftwood stopping facility Sediment Observation storage equipment dams Mazegawa Observation instruments sediment Parabolic antenna Rainfall observation device storage dam Monitoring device Water level observation device Yugakegawa Water quality monitoring instrument CCTV device sediment wireless equipment storage dam Utilization of Dam for the environmental improvement Iwaya dam exhibition hall Iwaya dam is adjacent to tourist spots including Kiso River Kokuti park, Gero hot Iwaya dam exhibition hall sits beside of reservoir and opens to the public. The spring, Seseragi street. A lot of people visit the places seeking for rich nature. project construction and completion, outline of the dam are shown in an easily “Reservoir Environment Improvement Project”, which aiming to develop locations understood way. Photos and panels are used to make the importance of water for camp, hiking, fishing utilizing the natural reservoir environment, is consigned resource clearly. from the MLIT and implemented. Kanayama Lake camp site Unohara Area Oshidou camp site Iwaya dam Iwaya Area exhibition hall Iwaya Dam Yugake Area Shirahata Area Tennis court Dam management facilities Reservoir conservation project Two sediment dams were con- structed at the end of reservoir Legend to reduce sediment amount Dam management office, control station flowing into the reservoir and Rainfall observation station Rainfall and snow observation station maintain its functions. Water level gauge Turbidimeter and water temperature gauge Siren and speaker station Speaker station Speaker wire station Wireless relay station Rainfall station Tyuro outlet Management office Yugakegawa Mazegawa sediment dam sediment dam Yugakegawa sediment dam Completion: March 1997 Crest length: 82.0m Iwaya Dam Height: 9.5m Crest elevation: EL.415.0 Sediment storage capacity: 79,000m3 Length of fish passage: 94.1m Mazegawa No.2 Dam Iwaya Dam Warning board Maze river Dam No.2 Maze river Hida river Mazegawa sediment dam Completion: March 1990 Crest length: 88.1m Height: 10.6m Crest elevation: EL.410.6 Sediment storage capacity: 170,000m3 Warning station Confluence.