Rainwater Harvesting Scheme for a School - Sekolah Kebangsaan Pendidikan Khas, Alor Setar PDF Print E-mail
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Wednesday, 04 March 2009 08:38

Brief description of the project:

A rainwater harvesting system has been established for the two hostels at a school in Alor Setar. Harvested rainwater is used as an alternative source of water for flushing toilets.

Rainwater is collected in a 2,000 litre tank and pumped through a filter to the toilet cisterns. The total water savings is 400-500 litres per day for the 42 school children. The system operates as designed.


The project has proved that rainwater can be used as an alternative water source. The rainwater harvesting system requires frequent maintenance. The system has been carefully designed to avoid growth of algae and breeding of mosquitoes.

Problem

Water, and especially potable water, is a limited resource and treatment of water up to drinking water quality can be difficult and expensive.

Solution

The project demonstrates how to collect and use rainwater as substitute for potable tap water for purposes that do not require the potable water quality.

System

The rainwater harvesting scheme has been established for the two hostels at the Sekolah Kebangsaan Pendidikan Khas in Alor Setar. The harvested rainwater is used as an alternative source of water for flushing toilets.

The school already had gutters installed to catch the rainwater from the roof. The rainwater is transferred from the gutters to a small flush tank and then stored in a 2,000 litre tank. From here it is pumped through a filter to the toilet cisterns via a pipe connected to the existing water pipe from the roof tanks. The pump delivers rainwater to the flushing cistern each time a toilet is flushed.

The system requires frequent surveillance and maintenance and some items must be taken care of to ensure maximum benefit of use of rainwater.

The project was carried out by Kedah Water Supply Department and funded by DID.

Advantages

    Utilization of an unused water source Reduction in the use of potable water Reduced cost for water treatment and distribution Reduced water bill for the consumer

This project has proved that rainwater can be used as an alternative water source. Systems have to be designed carefully to avoid growth of algae and breeding of mosquitoes.

For the system to be successful it is a precondition that the persons responsible for operating the system appreciate the advantages of rainwater harvesting and understand how the system works. It requires frequent maintenance, especially for cleaning of the water tanks. It should also be mentioned that the initial capital cost of the rainwater harvesting system is relatively high in relation to the savings made from not using tap water - partly because tap water is subsidised as consumers often do not pay for investments.

Management

The system is operated by the school. The Water Supply Department will continue to monitor the rainwater system.

Key data

Roof area: 100 m²
Flush tank: 200 litre
Collection/storage tank: 2,000 litre, efficient volume 1,500 litre
Daily toilet flush: 400-500 litre

Last Updated on Wednesday, 04 March 2009 21:03