Posts in category: Multipurpose Reservoirs

Client:
Climate Resilience Improvement Project – CRIP
Location:
Punugala, Yatiyanthota
Completed:
2019 -2020
Services:
Consultancy For Feasibility Studies
Project Value:
LKR 50.41 Mn

Central Engineering Consultancy Bureau (CECB) of Sri Lanka was entrusted to Carry out the Feasibility study of the Wee Oya Reservoir project (WORP) under the Climate Resilience Improvement Project (CRIP) implemented under the purview of the Ministry of Agriculture, Livestock Development, Irrigation and Fisheries and Aquatic Resources Development. Consultancy services cover the feasibility study for Wee Oya reservoir based on pre-feasibility study done by CRIP on Kelani basin. Main objectives of Wee Oya reservoir are controlling flood, which effects middle and lower Kelani basin, and augmenting drinking and industrial water supply in the Lower Kelani Basin during droughts. The secondary objective is harnessing possible hydro energy. The project area is located in Punugala, Yatiyantota area about 60km East of Colombo. The Wee Oya, which is an upper sub-basin of the Kelani River, is formed by joining number of streams draining from the Dolosbage mountain range. To form the Wee Oya reservoir, the Wee Oya is planned to be intercepted 60 m AMSL of river bed elevation near Malalpola by a dam to impound a multipurpose reservoir with a maximum FSL of 129 m AMSL. The area of the Wee Oya catchment upto the dam location is about 58 km². Elevation in the catchment ranges from about 60 masl to 1200 masl.

Client:
Mahaweli Authority of Sri Lanka
Location:
Pallegama at Matale District
Completed:
2014 -2018
Services:
Supervision, Coordination & Monitering
Project Value:
LKR 13 billion

Kaluganga Reservoir will comprise of 68m high rock fill main dam with a center clay core and a 28m high saddle dam of similar type. Gross storage capacity of the reservoir is 248MCM. Main aim of the project is to transfer 100MCM of water annually to Moragahakanda reservoir to cater for the downstream water demands of Moragahakanda reservoir and to release water for in basin irrigation development for 4000 ha of new and existing lands in Kaluganga. Further a provision is therefore to construct a 3MW power plant to make use of available head while releasing water to Moragahakanda

There are four Tunnels in this Project The details as below

Client:
Ministry of Irrigation
Location:
Sri Lanka / Badulla
Scheduled:
2019 -2023
Services:
Design & Supervision
Project Value:
LKR 395 Mn

Thalpitigala Reservoir of 15.56 MCM capacity by constructing a 280 m long and 45.7 m high roller Compacted Concrete (RCC) dam across the Uma Oya and diverting the stored water to the Power house through a 1.455 km long 3.5 m diameter headrace unlined tunnel to generate 51.3 GWh of power annually by two 7.5 MW turbines. Exit water of the power house will then be sent to the Bathmadilla anicut for the purpose of irrigation requirements.

Client:
Ministry of Mahaweli Development & Environment
Location:
Sri Lanka Welimada/Bandarawela/Wellawaya – Uva Province
Completed:
2013 -2019
Services:
Supervision, Coordination & Monitering
Project Value:
USD 514 Million

Uma Oya multipurpose Development project is proposed to transfer water from Uma Oya to Kirindi Oya in order to develop hydropower and to irrigate the dry and less developed south-eastern region of the central highlands. Capacity of the electrical power generation is 120 MW and irrigation of approx. 25,000 acres of paddy lands. This project consists of two reservoirs at Puhulpola and Dyraaba, a conveyance tunnel linking the two reservoirs of 3.98 km. length, a 15.2 km long HeadRace tunnel, a powerhouse and a TailRace tunnel. The Puhulpola Reservoir is on the Dalgolla Oya and the Dyraaba Reservoir on the Mahatotilla Oya, both rivers discharging into the Uma Oya. Essentially, both reservoirs are in the Uma Oya sub-basin in the Mahaweli basin. The Puhulpola Reservoir and the Dyraaba Reservoir are connected by the Link tunnel. The Head Race Tunnel (HRT) with an intake in the Dyraaba Reservoir conveys an annual water conveyance of 145 MCM, leads to the Power House at Karandagolla with installed capacity of 120 MW.  The tailrace tunnel from the Power House is directed into the Kirindi Oya. The Headeace Tunnel excavation is done by 2 Nos. Tunnel Boring Machines (TBM) which is a distinct part of this project.