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Rain Water

OHF Solution

Rainwater Harvesting

Rainwater harvesting is a sustainable and environmentally friendly practice that involves collecting and storing rainwater for various uses. This practice has gained significant attention as a solution to water scarcity and resource management challenges.


In many regions around the world, particularly in arid and semi-arid regions, water is scarce, and the demand for it is increasing due to population growth and climate change.

Potential Solution

Rainwater harvesting is an eco-friendly and cost-effective solution to this problem, as it allows individuals and communities to collect and store rainwater during the rainy season for use during the dry season. This can help alleviate water shortages, reduce the reliance on groundwater sources, and provide an alternative water source for various purposes, such as irrigation, domestic use, and industrial use. Additionally, it can help reduce erosion, flooding, and water pollution by capturing runoff water. More importantly, rainwater harvesting can provide a water source to developing regions facing poverty.

How it Works?

Rainwater harvesting involves the collection and storage of rainwater that falls on rooftops, driveways, and other surfaces.


The first step is to collect rainwater from the roof or other surfaces using gutters or downspouts. The rainwater is then directed to a storage tank or cistern.


Before the rainwater is stored, it is usually filtered to remove any debris such as leaves, twigs, and other particles. This can be done using a mesh filter or a first-flush diverter.


The filtered rainwater is then stored in a tank or cistern for later use. The size of the storage tank will depend on the amount of rainfall in the area and the intended use of the harvested rainwater.


When the harvested rainwater is needed, it can be distributed through a pump or gravity-fed system to where it is needed. This may involve connecting the rainwater harvesting system to a non-potable water supply system in the building.

Our Experience

OHF has installed a 32,000 litres Rainwater Harvesting system in Hope Village Prey Veng, Cambodia in 2003. It has also installed similar systems at Hope Training Centre , Cambodia and its children home in Pokhara, Nepal.