Validation of Detail Design Report to Sediment, Flood Proofing Drainage System under Component II of the CFGORRP

Community Based Flood and Glacial Lake Outburst Risk Reduction Project (CFGORRP) is a joint program undertaking of the Government of Nepal (GoN), Global Environment Facility (GEF) and the United Nations Development Programee (UNDP). The project is being implemented by the Department of Hydrology and Meteorology (DHM) under the Ministry of Science, Technology and Environment (MoSTE) as the lead Implementing Agency. The project has two components: component I focuses on the GLOF risk reduction from Imja Lake and the Component II is about the flood risk management in four Terai districts through structural and non-structural measures, preparedness activities, capacity building etc.

CFGORRP under component II has an objective to reduce human and material losses from recurrent flooding events in four flood prone districts of Terai and will have increased adaptive capacity of local communities in eight study VDCs through locally appropriate structural and non–structural measures, a sediment control programme, river bank, and slope stabilization and the implementation of CBEWS.

The project covered watersheds (Ratu, Khando, Gagan, Hadiya/Kong) are originated from Churia hills. The river channels originated from Churia hills in the Terai are also unstable leading to prolonged inundation, damage to river banks causing bank erosion and sediment deposits in the farmlands. Due to concentrated rainfall during monsoon, fragile/rugged and unstable land natures of Churia region, Churia originating rivers are responsible for intensive soil erosion, landslides, flash floods, and ultimately massive sedimentation in Terai. The sediments deposition on flat lands blocks the waterways which results several meandering of the river. Many people are displaced, and hundreds of hectares of lands are wasted. The selected VDCs of the four districts (Mahottari, Saptari, Siraha, and Udayapur) lie in the Terai Region (low lying flat zone) and being affected every year by flood and sediment deposition in the fertile land resulting in to loss of property, land, and human lives.

The Community Based Flood and Glacial Lake Outburst Risk Reduction Project (CFGORRP) has recently received the Final Report of two studies from the respective service providers. The report has highlighted need of project related various activities (i.e. slope stabilization, watershed management, elevated tube wells and flood proofing drainage systems) in the project area. Technical design, dimensions, location, quantity and cost estimates of these components as well as project prioritization based on vulnerability assessment are the main theme of the studies. However, their validation is important in the final decision making process because validation ensures that the dimensions, and locations of the project components are properly checked.