Abstract
Rain water is an alternative water resource for residential water purposes of the Mekong Delta, especially under impacts of climate change. However, the cost of rainwater harvesting system is still high for the low-income households in the Delta, in which the most expensive is the storage tank. This study is to optimize the rain water storage at household level for suitable volume, from that reduce the cost of the system. This study was conducted from July 2016 to March 2017 in Soc Trang city, Soc Trang province. It was 2-step as follows: 1) Interviewing 102 households on their current domestic water demands and capacity of rainfall; and 2) Optimizing the rain water storge tank according to the results of step 1. The study found that the average demand of a household is from 300 to 500 L/ day, the roof area is from 50 to 100m2, the water storage area is from 1 - 3 m2. With such water demand and storage area, the optimal tank volume is various from 1 - 3 m3 according to the tank material. The terracotta vessels is the lowest cost and the optimum tank volume is 1 - 3 cubic meters, the concrete tank is the highest cost and the optimal tank volume from 0.5 - 2 cubic meters.
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