THESIS ABSTRACT

Abstract

The Bode Water Treatment Plant was built in 2004 with a design capacity of 20 million liters per day (MLD). It mainly gets its water from two sources: surface and subsurface water from dug wells in the Manohara River, and groundwater from tube wells near the plant. This study looks at how much water is currently being produced from the Manohara River dug wells, compares it with the plant's original design capacity, identifies reasons for any changes in production, and suggests a full plan to improve and restore the system. The current demand of the water in the service area of the Bode WTP is 16.92 MLD. The analysis of the historical data, field surveys and key informant interviews revealed that meandering of the river especially from initial position, degradation of the infrastructures and operational inefficiency were the major causes for the decline in the water production. The Physical Structure Index (PSI) of the Bode Water Treatment Plant was found to be 71%, indicating that the infrastructure is operating at about 71% of its full functionality. Several key problems such as damage to the intake structures caused by flooding, sludge buildup in the dug wells, and mechanical failures such as pump breakdowns have contributed to this reduced performance. As a result of these issues, water production has significantly declined. In the year 2081 B.S., the average daily water production was 7.195 MLD, which is only 35.98% of the plant's original design capacity. To restore the water production from the dug wells, a rehabilitation plan has been proposed. This includes stabilizing the riverbank, deepening the existing wells, installing new perforated collection pipes, and constructing additional dug wells. The estimated payback period for these rehabilitation works is 6.67 years. There is an urgent need to carry out these improvements to meet the growing water demand and reduce the supply gap.

Keywords

Dug Wells, Physical Structure Index, Production, Rehabilitation