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Euro Guardeuro-guard | 09 March 2022

Rooftop Rainwater Harvesting Techniques

Here’s how to use roof top rainwater gathering in a variety of ways.

A) Direct-Use Storage

It’s no surprise that homeowners with large or water-intensive landscaping use far more water than an ordinary person. If you take into account, up to 40% of the water consumed in an average residential irrigated neigh Rainwater collected from the building’s roof is channelled to a storage tank in this way. Water demand, rainfall, and catchment availability must all be considered while designing the storage tank.

Before connecting to the storage tank, each drainpipe should have a mesh filter at the mouth and a first flush mechanism, followed by a filtering system is suggested. For best results, PVC rainwater gutters should be implemented.

Water that is not used might be redirected to a recharging system supported PVC Rainwater collection gutters. Water from the storage tank may be utilised for other things like washing and gardening. This is the most cost-effective approach to collect rainwater.

The primary benefit of collecting and using rainwater during the rainy season is that it not only saves water from traditional sources, but it also saves energy on water transportation and distribution at the doorstep. If groundwater is being withdrawn to satisfy demand using efficient PVC rainwater gutters when rains are falling, this helps to conserve it. Brands like Euroguard HySquare rainwater gutter system are recommended.

B) Recharging aquifers with groundwater

Groundwater aquifers may be refilled in a variety of ways to guarantee that precipitation percolates into the ground rather than draining away from the surface. The following are some of the most often utilised recharging methods:

  1. Bore well recharging
  2. Replenishment of excavated wells
  3. Refill pits
  4. Trenches Recharge
  5. Recharge Shafts or Soakaways
  6. Percolation Tanks

C) Recharging of bore wells

Rainwater collected on the building’s roof is sent to a settling or filter tank through drain pipes. Filtered water is transferred to bore wells after settlement to fill deep aquifers. Bore wells that have been abandoned can also be utilised for recharging.

The optimal capacity of a settlement tank/filtration tank may be calculated using the catchment area, rainfall intensity, and recharge rate. Floating matter and silt should not be let into the recharge structure since they can clog it.

D) Refill pits

Recharge pits are tiny pits that can be rectangular, square, or circular in shape and are enclosed by a brick or stone masonry wall with weep holes at regular intervals. Perforated coverings can be used to cover the top of the pit. Filter media should be placed in the pit’s bottom.

E) Recharge or soakaway shafts

Recharge pits are tiny pits that can be rectangular, square, or circular in shape and are enclosed by a brick or stone masonry wall with weep holes

Where the upper layer of soil is alluvial or less pervious, soakaway or recharge shafts are supplied. These are bore holes with a diameter of 30 cm and a depth of 10 to 15 metres, depending on the depth of the previous layer. To prevent the vertical sidewalls from collapsing, the bore should be lined with slotted/perforated PVC/MS tubing.

A needed size sump is built at the top of the soakaway to collect runoff before it filters through the soakaway. Filter media should be placed in the sump.

F) Replenishment of excavated wells

A well that has been dug can be utilised as a recharge structure. After flowing through a filter bed, rainwater from the rooftop is channelled to excavated wells. To improve the recharge rate, the excavated well should be cleaned and desalted on a regular basis. It is possible to employ the filtering method described for bore well refilling.

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