| Overview
of the Mahaweli Project Moragahakanda
& Kaluganga Development Projects Moragahakanda
& Kaluganga Development Project is the largest reservoir project
to be taken up for development under the Mahaweli River Development
Programme. - To provide irrigation water facilities to 81,422 ha in the Dry Zone of Sri Lanka - Potable and Industrial Water Supply to Anuradhapura and Trincomalee towns - Generation of electricity by hydro power The project area is located in the Central and North Central Provinces in Sri Lanka. The project consists of (a) Construction of two major reservoirs namely; Moragahakanda and Kaluganga reservoirs, (b) A conveyance system consisting of two tunnels and transfer canals and (c ) A power house of 20 MW installed capacity. Moragahakanda Reservoir Type of Dam: A roller compacted concrete main dam and two rock fill saddle dams. Maximum dam height: 65 metres Active Storage : 521 million cubic metres
Type of Dam A rock fill main dam and two saddle dams, one rock fill and the other earth Maximum Dam Height 67 metres Active Storage
144 million cubic metres 2. Second Bowatenna Tunnel 25 m3/sec. capacity, length 7.2 km Conveyance Canals : Total length approximately 50 Km.
The investment cost of the project is US $ 382 million. The Economic Internal Rate of Return (EIRR) is 22%. Agriculture : Cropping intensity which varies less than 100% to 154% in the different areas will be raised to around 181% on the average. The direct benefits include increased rice yield per hectare with an additional agricultural production of 109,000 tons annually. The net annual agricultural benefit will be US $ 27.7 million in financial terms. Inland Fishery: The average annual fish production potential of the reservoir is estimated to be around 4,700 tons per year, representing a net benefit of US $ 1.67 million annually. Potable and Industrial Water Supply : An increased supply of 64 MCM (by the year 2032) could be ensured towards meeting the potable and industrial water needs in the district of Matale, Anuradhapura, Trincomalee and Polonnaruwa from the surface water sources in the Ambanganga basin and its associated tanks and canals with the implementation of the project. Annual fuel cost savings with the hydropower produced will be around US $ 2.49 annual average. The following constitute the environmental management action plan that has been proposed as part of the project : a) Reforestation
of about 2000 ha in the Amban Ganga Basin Project implementation period will be 5 years which includes design and construction. Expected year of commencement of work will be 2007. The project
will be implemented by the Mahaweli Authority of Sri Lanka under
the supervision of the Ministry of Agriculture, Irrigation &
Mahaweli Development.
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