Low Cost Rainwater Harvesting: An Alternate Solution to Salinity Affected Coastal Region of Bangladesh

Kamal Ziaul Islam^1, , Md Sirajul Islam², Jean O. Lacoursière³ and Lisa Dessborn⁴

¹Assistant General Manager, Jessore Palli Bidyut Samity-2, Jessore, Bangladesh

²Department of Civil and Environmental Engineering (CEED) North South University, Dhaka, Bangladesh

³Professor, Kristianstad University, Kristianstad, Sweden

⁴Senior Lecturer, Kristianstad University, Kristianstad, Sweden

Cite this paper:
Kamal Ziaul Islam, Md Sirajul Islam, Jean O. Lacoursière and Lisa Dessborn. Low Cost Rainwater Harvesting: An Alternate Solution to Salinity Affected Coastal Region of Bangladesh. American Journal of Water Resources. 2014; 2(6):141-148. doi: 10.12691/ajwr-2-6-2

Abstract

This study investigated the prospect of rainwater harvesting as a low cost alternative potable water supply option along the coastal region of Bangladesh, which is considered as one of the most vulnerable countries in the world due to climate change and resulting sea level rise. Because of increasing salinity intrusion, potable water scarcity become severe at the south-western coastal region of the country. The study area for this investigation was Patkelghata in Satkhira district of Bangladesh located in the same zone. The Satkhira district averages nearly 1,710 mm rainfall per year. Based on rural housing pattern of the region, a rainwater harvesting system is proposed, which consists of roof catchment, gutters, down pipes, first flush devices, filter chamber and storage tank. The minimum catchment area was assumed to be 6 m² and storage tank of 2000 liter capacity. Data was collected on the present state of freshwater supply, sources and quality, average rainfall in the region, dry spell period, family size, water use nature, rain water quality and material to be used for storage, etc. Rainwater quality was also tested and the parameters were found to be within Bangladesh’s standard limit. After a detail calculation, an approximate cost was assumed to be $171 for building and operation of the whole system. A questionnaire survey was also conducted on views and opinion of local people to understand the problems, prospects and the popularity of rainwater harvesting in Bangladesh.

Keywords:
climate change impact salinity intrusion fresh water crisis rainwater harvesting design of storage tank cost analysis management options

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