The Teesta river is prone to flash flooding which contributes a huge amount of sediment and water every year to the huge Brahmaputra river. However, a vast area of the northern part of Bangladesh suffers from a scarcity of water for irrigating agricultural land throughout the year, even during the monsoon. In an effort to resolve the water scarcity, the idea of gravity irrigation with water from the Teesta river was conceived in 1945 during British rule. After achieving independence, the government of Pakistan finished the feasibility survey and took an initiative to start this irrigation project. According to the Project Proforma (PP) of Teesta Barrage Project, the proposed date of commencement was 1960/61. After the independence of Bangladesh, the engineers of Bangladesh Water Development Board (BWDB) and Bangladesh University of Engineering and Technology (BUET) reviewed the previous feasibility survey and redesigned the project and selected Doani, Nilphamari for the barrage (BWBD, 1990). The construction of the barrage was started in 1979 and completed in 1992. Phase-I of the Teesta Barrage Project was completed in 1998, and was located 20 km south of the border with India. The total command area of Phase-I and Phase-II of the Teesta Barrage Project are about 111,406 hectares and 448,774 hectares, respectively. The construction of Phase-II began in 2005, but due to insufficient water flow in the non-monsoon period, the project is still incomplete (Wirsing & Jasparro, 2007). In 2004, the Central Electricity Authority of India prepared a preliminary feasibility report of 162 new hydroelectric schemes with a total potential of over 50,000 MW, where Sikkim has ten schemes with an installed capacity of 1,469 MW (CEA, 2015). In 1974, a committee was formed to study the hydropower potential in Sikkim. Sikkim welcomes private developers for developing and exploiting its hydropower potential, which has been assessed as 8,000 MW peak with a firm base of 3,000 MW. Total hydropower potential in the state so far is 5,352.7 MW and there are different stages of implementation (EPDS, 2019). About 47 hydropower development projects are in different stages.