rain water harvesting


Rain water harvesting (RWH) is a technique of collection and storage of rainwater into natural reservoirs or tanks, or the infiltration of surface water into subsurface aquifers (before it is lost as surface runoff). One method of rainwater harvesting is rooftop harvesting. With rooftop harvesting, most any surface — tiles, metal sheets, plastics, but not grass or palm leaf — can be used to intercept the flow of rainwater and provide a household with high-quality drinking water and year-round storage. 

Rainwater harvesting is an innovative alternative water supply approach anyone can use. RWH captures, diverts, and stores rainwater for later use.

Implementing rainwater harvesting is beneficial because it reduces demand on existing water supply, and reduces run-off, erosion, and contamination of surface water.

Rainwater can be used for nearly any purpose that requires water. These include stormwater control, rain gardens, landscape use, in-home use, agricultural use, industrial use and fire protection etc. 

Why rainwater harvesting?

In areas where water supply is problematic or water resources are scarce, rain harvesting is a good solution. It reduces the dependency on groundwater for uses such as landscaping, toilet flushing, laundry etc, easing the pressure on well, bore hole, public water systems; and reduces stormwater runoff peak flow and volume.

Rainwater harvesting can provide clean water-supply for a small community. Especially when pipelines are too expensive to set up and one central well or pump cannot be used all around the year, a rainwater catchment system is a workable solution. By collecting and using rainwater, you can also be assured that you have some of the cleanest, healthiest water available, as it will not have been treated with chemicals as the water that comes from your taps will have been.

Some advantages of rain harvesting:

  • Easily accessible
  • Set-up costs are low, with easy construction and  low-cost materials
  • Easy maintenance at household level
  • Sustainability is higher
  • Easily adaptable to different types of communities
  • Promotes both water and energy conservation
  • Reduce erosion and flooding

Rainwater harvesting Components

All rainwater harvesting systems (RWHS) have basics components, which include a catchment/collection surface, conveyance system, storage, distribution, and treatment. A RWHS can range in size and complexity. For more information on each, please see the menu on the right titled “RWH Components.”


  • Catchment/Collection Surface
  • Conveyance System
  • Storage
  • Distribution
  • Treatment


storm water (rainwater) management


Storm water (rainwater) is water that comes from precipitation and ice/snow melt – it either soaks into exposed soil or remains on top of impervious surfaces, like pavement or rooftops. Stormwater will eventually evaporate off of a level surface, but most often it flows as runoff to another location.

Storm water (rainwater) runoff is any water running off a land surface before it reaches a natural water body. It occurs when the rate of precipitation is greater than it can infiltrate, or soak, into the soil. Runoff also occurs when the soil is saturated. Runoff remains on the surface and flows into streams, rivers, and eventually large bodies such as lakes or the ocean.

Movement of this storm water(rainwater) across the soil causes erosion. It can also carry and deposit untreated pollutants, such as sediment, nutrients and pesticides, into surface-water bodies.

Impervious surfaces such as driveways, sidewalks, parking lots and streets block rainfall and other precipitation from infiltrating naturally into the ground, leading to even more stormwater and potential pollutant runoff.

Most of the world water problems such as flooding, drought, water pollution, water shortage are all related to rainwater. Due to climate change and urbanization, water  problems are increasing throughout the world in both developing and developed countries. By proper rainwater management, we can reduce the risk of such problems and enhance the resilience.

Storm water (Rainwater) management solutions are techniques used to reduce rainwater runoff from causing damages, flooding and dispersing pollutants. Stormwater management involves detaining, retaining, or providing a discharge point for rainwater to be reused or infiltrated into the groundwater

One of the solutions designed to manage storm water (rainwater) is Rainwater Harvesting. Rainwater Harvesting (RWH) offers a small-scale best management practice to reduce stormwater runoff and the problems associated with it. By harvesting the rainfall and storing it for later use or direct groundwater recharge, water is slowly released back into the soil and then moves into groundwater table, providing a steady supply of water to local streams and river. 

Rainwater harvesting can be used to achieve a source control of rainwater, as it significantly reduces the peak flow and volume of rainwater runoff. 

Collecting and Using rainwater strengthens the hydrological  cycle, reduces storm water runoff and limit the demand for water from well, lakes, reservoirs and rivers. It’s a self-sufficient renewable water source that eliminates the need to rely on water treated with chemicals.


  • Landscaping
  • In-home Use
  • Fire protection
  • Agriculture
  • Industrial

Other Storm water (Rainwater) management Solutions

  • Green Roofs
  • Permeable Surfaces
  • Rain Gardens
  • Silt Removal
  • Swales
  • Infiltration Trench
  • Soakaway
  • Bioretention
  • Ponds
  • Wetlands
  • Detention Basins
  • Infiltration Basins
  • Geocellular /Modular Systems

Read more about these solutions in our coming posts or call +2348158942188 to discuss any of these solutions

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