Rain Water Harvesting Systems and India

Down pipe and first flush arrangement


This is an arrangement to prevent the dust and other unwanted materials that may be seen on the roof, from reaching the storage tank


(Act-Wisy filters are equipped with this feature and German made filters are now available in India through Act-Wisy )

Filter unit

The rainwater collected from the roof should be allowed to reach the storage tank only through a filtering mechanism.

FEATURES: ACY WISY Rainwater harvesting filters

• Garden Collector Downpipe Filter
• Collects more than 90 % of rainwater from the roof and feeds it to the rainwater barrel.
• Compact design for simple installation in round vertical rainwater downpipes.
• Eliminates all kind of debris with filter insert.
• Functions as security overflow.
• Top quality in stainless-steel, easy installed.
• Full cross-section of downpipe maintained.
• Nil/ low maintenance.
• High quality units with a proven track record for reliability and efficiency.
• Corrosion and frost proof.
• Filter inserts extremely low maintenance, dishwasher safe.
• Available in various sizes to suit most round pipes.

Storage tank

Mainly three types of storage tanks are constructed for roof water harvesting. They are above ground, underground or sub surface tanks.

Contour bunding

Contour bunding is the farming practice of ploughing and/or planting across a slope following its elevation contour lines. These contour lines create a water break which reduces the formation of rills and gullies during times of heavy water run-off; which is a major cause of soil erosion. The water break also allows more time for the water to settle into the soil.


Bench terraces


Bench terraces are a series of level or virtually level strips running across the slope at vertical intervals, supported by steep banks or risers.


Check dam


A check dam is a small, often temporary, dam constructed across a swale, drainage ditch, or waterway to counteract erosion by reducing water flow velocity. Check dams themselves are not a type of new technology; rather, they are an ancient technique dating all the way back to the second century A.D. Check dams are typically, not always, implemented as a system, consisting of several check dams situated at regular intervals across the area of interest.