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Rainwater harvesting can be divided into two categories: surface runoff harvesting and rooftop rainwater collection. Rainwater harvesting system in bangalore is the process of collecting and storing rainwater for on-site reuse rather than letting it run off. The water is used for a variety of reasons, including gardening, irrigation, and so on. This page discusses a variety of rainwater gathering techniques.

Rainwater Harvesting Methods

1. Surface Runoff Harvesting

Rainwater in urban areas runs off as surface runoff. By using appropriate technologies, this discharge can be captured and used to recharge aquifers.

2. Rainwater Harvesting on the Roof

It is a rainwater collection system that captures rainwater as it falls. The roof becomes the catchment in rooftop harvesting, and rainwater is collected from the house/roof.

  1. Catchment
  2. Transportation
  3. First Flush
  4. Filter
  5. Sand Gravel Filter
  6. Charcoal Filter
  7. PVC –Pipe filter
  8. Sponge Filter

Rainwater Downpipe System and Rooftop Rainwater Harvesting Techniques

This section shows how to use roof top rainwater gathering in a variety of ways.

1. Direct Use Storage

Rainwater collected from the building’s roof is channelled to a storage tank in this way. Water requirements, rainfall, and catchment availability must all be considered while designing the storage tank.

2. Groundwater Aquifer Recharge

Groundwater aquifers can be recharged in a variety of ways to guarantee that rainwater percolates into the ground rather than draining away from the surface.

3. Bore Well Recharging

Rainwater collected on the building’s roof is channelled to a settlement or filter tank via drain pipes and PVC Rainwater Gutter. Filtered water is transferred to bore wells after settlement to fill deep aquifers. Bore wells that have been abandoned might cause a lot of problems.

4. Pits to Recharge

Recharge pits from rainwater outlets are small pits of any shape, such as rectangular, square, or circular, enclosed by a brick or stone masonry wall and punctuated by weep holes at regular intervals. Perforated covers can be used to cover the top of the pit. Filter media should be placed in the pit’s bottom.

5. Recharge Shafts or Soakaway

Where the overlying layer of soil is alluvial or less porous, soakaway or recharge shafts are provided. These are bore holes with a diameter of 30 cm that can reach 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.

6. Replenishment of Dug Wells

Wells that have been dug can be used as a recharge structure. After passing through the filtration bed, rainwater from the rooftop is channelled to drilled wells.

7. Recharge Trenches

Where the upper impermeable layer of soil is shallow, a recharge trench is provided. The recharge trench is a hole in the earth that is filled with porous media such as pebbles, boulders, or brickbats. It’s typically used to collect surface runoff.

8. Percolation Tank

Percolation tanks are man-made surface water bodies that submerge a land area with enough permeability to allow enough percolation to recharge the groundwater. These can be erected on large campuses with accessible land and acceptable topography.

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