Harvested rainwater is an alternative source of water in arid and semi-arid regions (ASARs) around the world. Many researchers have developed and applied. Identification of Suitable Locations for Rooftop Rainwater Harvesting Structures. Article · April with Reads. DOI: /ijaser Cite this. Collected water can also be used for replenishing a well or the aquifer (see also surface or subsurface artificial groundwater recharge). In a case study of SHRESTHA , excess rainwater during the rainy season is used to recharge a dug well, as well as the groundwater.


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Rooftop rainwater harvesting system. Rainfall A catchment area or roof surface to collect rainwater.


Delivery systems gutters to transport the water from the roof or collection surface to the storage reservoir. Storage reservoirs or tanks to store the water until it is used. Process diagram of a drinking water RWH system.

Average Annual Rainfall in different regions.

Rainwater Harvesting (Urban) | SSWM - Find tools for sustainable sanitation and water management!

Tropical climates with short one to four month dry seasons and multiple high-intensity rainstorms provide the most suitable conditions for water harvesting.

In addition, rainwater harvesting may also be valuable in wet tropical climates e. Bangladeshwhere the water quality of surface water rain water harvesting structures vary greatly throughout the year.

Guttering is used to transport rainwater from the roof to the storage vessel. Guttering comes in a wide variety of shapes and forms, ranging from the factory made PVC type similar as the pipes used in water distribution systems to home made guttering using bamboo or rain water harvesting structures metal sheet.

Example of a first flush device white, vertical PVC pipe, left.

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Illustration of the working principle of the device right. When the first rains arrive, this unwanted matter would be washed into the tank. This will cause contamination of the water and rain water harvesting structures quality will be reduced.

These systems are called first flush devices. The simpler ideas are based on a manually operated arrangement whereby the inlet pipe is moved away from the tank inlet and then replaced again once the initial first flush has been diverted. This method has obvious drawbacks in that there has to be a person present who will remember to move the pipe.

There are almost unlimited options for storing rainwater. Common vessels used for very small-scale water storage in developing countries include plastic bowls and buckets, jerry cans, clay or ceramic jars, cement jars, old oil drums, empty food containers, etc.

For storing larger quantities of water, the system will rain water harvesting structures require a tank above or below ground. Surface tanks are most common for roof collection.

Materials for surface tanks include metal, wood, plastic, fibreglass, brick, inter-locking blocks, compressed soil or rubble-stone blocks, ferro-cement and reinforced concrete. The choice of material depends on local availability and affordability.

Rain water harvesting structures material and design for the walls of sub-surface tanks or cisterns must be able to resist the soil and soil water pressures from outside when the tank is empty.

Tree roots can damage the structure below ground. There are a number of different methods used for sizing the tank.

These methods rain water harvesting structures in complexity and sophistication. Some are readily carried out by relatively inexperienced, first-time practitioners, while others rain water harvesting structures computer software and trained engineers who understand how to use this software.

The storage requirement will be determined by a number of interrelated factors, which include: In reality the cost of the tank materials will often govern the choice of tank size.

Factsheet Block Title Infiltration Factsheet Block Body Collected water can also be used for replenishing a well or the aquifer see also surface or subsurface artificial groundwater recharge.

In this case recharging the groundwater even improved the water quality in the dug well.

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Factsheet Block Title User behaviour Factsheet Block Body Depending on the user behaviour the storage and treatment water quality infrastructure is probably different.

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