International Rainwater Catchment Systems Conference
Catchment: An Answer to the Water Scarcity of the Next Millennium."
Petrolina, Brazil - July 1999
Section 7: Water Quality
Comparative Review of Drinking Water Quality from
Different Rain Water Harvesting Systems in Sri Lanka
Lanka Rain Water Harvesting Forum
No.5, Lionel Edirisinghe Mawatha
Kirulapone, Colombo 5, Sri Lanka
The main constraints on using rain water for domestic use
have been the water quality aspects. The quality of rain water collected
depends on the cleanliness of the atmosphere, materials used for the catchment surface,
gutters and down pipe of the storage tank and the water extraction device. In
the hill country and in the north central province acid rain has been recorded
and in the western province rain water has carried high nitrate levels.
Compared to other industrialised countries in the region, however, acid rain is
still not considered a serious problem in Sri Lanka.
This study reviews the quality of rain collected throughout
Sri Lanka from different types of storage tanks and roofs. It will compare the
traditional rain water collecting methods with the present available technology
of the Community Water Supply and Sanitation Project (CWSSP). It looks as the
health aspects of drinking rain water related to biological contamination and
indirectly due to disease vectors like mosquito and other insects/pest breeding
in the stored water. Recommendations will be given on the different water
treatment methods along with some suggestions for improvement.
The result shows that the rain water collected and stored with
adequate care meets the microbiological standards set by the WHO for total
coliform in drinking. The data obtained reveal that the quality of the rain
water collected depends on the storage and the management of the system.
PDF of full document (7pp, 47kb)
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