Chapter 15 Water Resources Development Plans 15.1
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CHAPTER 15 WATER RESOURCES DEVELOPMENT PLANS 15.1 Necessity and Objectives of Water Resources Development Plans It is essential to study including development plan on the water resources management, in order to improve present water use condition, to increase useful water quantity and to get sustainable stabile water use; and we have to recognize that although present water use condition is improved by better management, the quantity will not be increased without development/ investment. The objectives of the integrated development plans for water resources management are in order to solve issues as studied in Chapter 14.2. The countermeasure for issues on water demand and supply balance and the proposed development projects are shown in Table 15.1-1. The priority projects are defined by mean of projects which would be expected the execution upto 2015 year. 15 - 1 Table 15.1-1(1) The Countermeasure for the Isuues and Proposed Projects (1/2) Basin No Issues Countermeasure & Proposed Project COMOE ① Abidjan urban water supply ・Short term countermeasure-1):The Agneby river integrated development :Q = 120,000m 3/day. Management Basin ・Short term countermeasure-2): The river mouth lake development of lagoue (under study by MIE): :Q ≒ 120,000m3/day ・Short term countermeasure-3):underground water development(Uper limit:380,000m3/d). ・LonLongg term countermeasure.:Comoe river inteintegratedgrated develodevelopmntpmnt: :Q=110m3/s(about 9.5milion m 3/day) ② The urban water supply in local cities ・It is necessary to investigate the underground water development and 15 -2 on Comoe river up-stream reservoir developmentin of the each local cities. ③ Rural water supply ・To contenue the underground development for un-development area of water supply. 3 ④ To improve the low water use rate of Comoe ・Comoe river integrated development:Q = 110 m /s (100%water use rate) river. Maximum ppowerower outoutputput = 224.5 MW // Annual ppowerower pproduction:roduction: 815 GWH (61% of existing total hydropower energy) ⑤ Water supply shortage in coastal area ・The issue could be solved by the Comoe river integrated development (tow time harvest in one year possible). ⑥ To use the controled water by Ayame-1 ・Aboiso hydro-power development(downstream of Ayame-No.2):P = 6,400 KW ⑦ Flood inundation in Agboville city ・Agneby river integrated development:Peak cut of flood = 330→100m 3/s Table 15.1-1(2) The Countermeasure for the Isuues and Proposed Projects (2/2) Basin No Issues Countermeasure & Proposed Project BANDAMA ① Urban water supply in Kohrogo/Yamoussoukro・To prepare the reservoir operation rules of the existing dams・reservoir. Management Basin ② The urban water supply in local cities ・Marhoue river inteintegratedgrated develodevelopmentpment:SteadSteadyy urban water susupplypply for Bouafle etc. local cities are ppossible.ossible. on Bandama river up-stream ・Integrated rural development in the middle valley of Nzi river as below mentioned:Multipurpose development with agriculture. ③ Rural water supply ・To contenue the underground development for un-development area of water supply. ④ Agricultural water large shortage ・Integrated rural development in the middle valley of Nzi river (M'Bahiakro/Bocanda and 13 dams construction) ⑤ Inflow shortage into Kossou dam ・Marahoue river integrated development:Increased inflow into Kossou dam Q = 34m 3/s(Increased 40%) Increased ppowerower pproductionroduction:99 GWH ( %Increased) 15 -3 SASSANDRA ① Urban water supply of Man cityin ・Reservoir facilities of Man citcityy water susupply.pply. Management Basin ② The urban water supply in local cities ・It is recommended to investigate the detailed water balance and water source of each local cities. on Sassandra river up-stream ③ Rural water supply ・To contenue the underground development for un-development area of water supply. ④ Agricultural water shortage in dry ・Dounou river integrted development:Q = 0.70m 3/s(700ha)//Small hydro power:P = 34KW(0.3 GWH) season and to promote the rural elctrification ・To promote the agricultural products which are low water consumption in dry season ⑤ To use effectively the controled water by Bu ・Soubre hydro-power development(downstream of Buyo dam):P = 27,000 KW(218 GWH) ・Louga hydro-power development(downstream of Soubre dam):P = 30,000 KW(239GWH) 15.2 Water Resources Development Plans 15.2.1 Integrated River Surface Water Development (With Multipurpose Dam) Integrated river surface water development with multipurpose dams are as shown in Table 15.2-1. 15 - 4 Table 15.2-1 Priority Projects on Integrated River Surface Water Development (With Multipurpose Dam) (1/2) Project Name Project Contents Project Purpose / Production ①MARAHOUE RIVER INTEGRATED DEVELOPMENT PROJECT Catchment area = 18,000 km2 Dam (H×L): 25m×3,700m (Recovery Plan of the Storage in the Kossou Reservoir) Reservoir: Surface area = km2 Total Capacity=1,500 MCM MCM Purpose: Hydropower/ Irrigation/ Fishery Development/ Maintaining Normal Effective capacity =1,100 Reservoir: HWL=195m/ LWL=188m Function of River (Environmental Conservation: E.C.) Available develop. Discharge=41 m3/s Production from the project : Diversion water to Kossou Dam = 34 m3/s Discharge on Marahoue river = 7 m3/s ・Hydropower: Increasing energy production of Kossou P.S. = 84 GWH Construction cost 51,300 M FCFA Small hydropower: Pmax.= 1.7 MW / Energy production=15 GWH ・ Hydropower : 42,500 MFCFA (83%) Total annual energy production =99 GWH ・ Power unit cost : 429 FCFA/ KWH ・Urban water supply for Bouafle city; 23,000 m3/day ・ Irrigation /River :8,800 MFCFA (17%) Project process 3 ・ Irrigation for paddy field (Continuos constant): 4.9 m /s (4,900 ha) ・ Development study (F/S): 1.5-2 years ・River maintenance discharge (Continuos constant) 1.8 m3/s ・ Detailed design (D/D): 1-1.5 years ・ Construction: 4-5 years 2 ② Catchment area = 74,610 km COMOE RIVER INTEGRATED DEVELOPMENT PROJECT Dam (H×L): (NDIELISSO Multipurpose Dam on Comoe River) ・Main dam = 100m×1,200m ・Re-regulating dam =42m×300m PurposePurpose: Hydropower/ Urban Water Supply/ Prevention of river mouth Reservoir: ・ Surface area : clogging / Prevention of ssediment in Lagoon・Maintaining Main = 730 km2 Normal Function of River(E.C.) Re-regulating = 2.7 km2 Production from the project : ・Total Capacity : Main = about 22,100 MCM ・Hydropower : Main : Pmax = 200 MW / Energy production 600 GWH Re-regulating = 40 MCM Re-regulating : Pmax = 24.5 MW / Energy production 215 GWH ・ Effective capacity : Total : P = 224.5 MW / Energy production 815 GWH Main = about 6,000 MCM max MCM ・ Re-regulating = about 10 It is possible to supply continuously a water of 111 m3/s for: ・ HWL =Ma/ Re(117m/ 40m) -Abidjan water supply in future ・ LWL =Ma/Re(112m/ 35m) -Prevention of river mouth clogging Available develop. Discharge=111 m3/s Construction cost = 279,100 M FCFA -Prevention of ssediment in Lagoon ・Main dam : 243,100 MFCFA -Maintaining Normal Function of River(E.C.) ・ Re-regulating dam: 36 MFCFA -Irrigation in downstream area of the proposed dam site -Power kwh cons. cost : 342 FCFA/KWH -Power KW cons. cost :1,243 US$/KW Project process ・ Development study (F/S):1.5-2 years ・ Detailed design (D/D): 1.5-2 years ・ Construction: 5-6 years 2 ③ Catchment area = 4,600 km AGNEBY RIVER INTEGRATED DEVELOPMENT PROJECT Dam (H×L): 20m×250m Reservoir: Surface Area = 5 km2 PurposePurpose: Flood Prevention/ Urban Water Supply/ Small hydro electric Total Capacity=25 MCM Reservoir: HWL=33m/ LWL=28m Power / Maintaining Normal Function of River(E.C.) Available Develop. Discharge=1.5m3/s Production from the project : Construction cost = 8,830 M FCFA ・ Flood Prevention : Available flood reduction (50 years) ≒ 230 m3/s 3 Project process ・ Urban water supply : Available intake discharge≒ 1.5 m /s ・Basic Design (B/D)/ (D/D): 1.5-2 years 3 (For Agboville & Abidjan cities) (130,000 m /day) ・Construction: 2-3 years or For irrigation in area of downstream of proposed dam site ・Hydropower: Small hydropower: Pmax.=160 KW/Energy production=1.34 GWH 15 - 5 Table 15.2-1 Priority Projects on Integrated River Surface Water Development (With Multipurpose Dam) (2/2) Project Name Project Contents Project Purpose / Production ④DOUNOU RIVER INTEGRATED DEVELOPMENT PROJECT Catchment area = 600 km2 Dam (H×L): 15m×400m Reservoir: Surface Area = 8 km2 Purpose: Irrigation/ Urban Water Supply ( Odiene city)/ Fishery Total Capacity=23 MCM Development/ Maintaining Normal Function of River (E. C.) Reservoir:HWL=398m/ WL=394.5m Available Develop. Discharge=0.7m3/s Production from the project : Production from the project : Construction cost = 3,500 M FCFA ・Hydropower: Small hydropower: Pmax.=34 KW/Energy production=0.3 GWH ・It is possible to supply continuously a water of 0.7 m3/s for: Project process - Irrigation ・Basic Design (B/D)/ (D/D): 1.5-2 years ・Construction: 2-3 years -Odiene city water supply -Maintaining Normal Function of River(E.C.) ⑤INTEGRATED RURAL DEVELOPMENT PROJECT M’Bahiakro/ Bocanda Low Dams, and 13 Dams For Paddy Rice 4,638ha IN THE MIDDLE VALLEY OF NZI (B1.00.52.15.1) (Bocanda/ Bongouanou/ Dimbokro/ M’Bahiakro Department) Construction cost: 60,960 MFCFA Project process Purpose: Irrigation for Paddy/ Maintaining Normal Function of River (E. C.) ・ Development study (F/S): 2-3 years ・ Detailed design (D/D): 2-3 years ・Implementation of the project: 5-6 years ⑥INTEGRATED RURAL DEVELOPMENT PROJECT Canal 31.4km, For Paddy Rice 575ha IN THE SAN-PEDRO PLAIN Project Cost: 6,766 MFCFA (San-Pedro Department) Project process ・Basic Design (B/D)/ (D/D): 1-1.5 years Purpose: Irrigation for Paddy/ Maintaining Normal Function of River (E. C.) ・2-3 years 15.2.2 Water Resources Development Plans for Agricultural Proper Projects (Agriculture, Livestock and Fishery) Water resources development plans for agriculture are included in every projects on the integrated river surface water development with multipurpose dams in Table 15.2-1, especially the integrated rural development projects have been planed as main purpose of irrigation for paddy. In addition to above integrated development, proper projects for agriculture are shown in Table 15.2-2.