Components of the Modular Rainwater Harvesting System

*Our Design Philosophy consists of Seven Components of the Modular Rainwater Harvesting System.

Types of Rain Water Harvesting based on Catchments:

  • Rooftop Rain Water Harvesting
  • Surface Runoff Harvesting

Rain Water Collection Potential

The Annual Potential of Rainwater that can be collected from a particular catchment depends upon the catchment area, annual average rainfall of the location, and collection coefficient based on the type of catchment. If divided by the number of rainy days in a year, it gives the Rainwater Harvesting Potential per day.


Channelization is the process of installing systems that carry Collected Rainwater from the catchment to the desired location through rainwater channels/pipes. In the case of the flat roofs, channelization is done through rainwater down take pipes, and for sloping roofs, it is done through gutters. In the case of surface run-off Rainwater Harvesting Systems, water is channelized through stormwater drains, trenches, or along the natural slope.

First Flush Device OR Primary Filtration

In the case of roof-top rainwater harvesting, the first-flush or primary filtration arrangement is inevitable before directing roof-top rainwater to the storage tank. The first-flush arrangement allows us to drain out the initial load of impurities due to suspended particles that are typically found in the first 2-3 monsoon spells every year. The primary filtration reduced the maintenance cost of the installed Rain Water Harvesting System.


The word “Harvesting” relates to Agriculture Sector, wherein, utilizing the harvested or collected produce is a first and crucial step. This allows us to first ensure that Our Needs are fulfilled and whatever is surplus is taken to the next step of processing ensuring that there is no wastage. Similarly, We at ‘Water Field’ Group strongly believe in design optimization which suggests appropriately-sized storage tanks that allow us to utilize Rainwater for our Secondary Water Needs during Monsoons and on the other hand cut down the Infrastructure Costs and reduce the Pumping Costs during Monsoons, significantly.


Stored Water is distributed to the end-utility points by gravity. Such utility points include all devices supplying water for all Secondary Water Needs like flushes, garden pipes, sprinklers, common Taps for Car Washing, etc. The separate distribution system is designed to avoid possibilities of mixing with potable water, thus ensuring Safe utilization of available rainwater Only for secondary purposes.


The Goal of facilitating Artificial Recharge into Groundwater Sources, is to encash its multifold benefits. With proper identification of Recharge locations, using scientific approach, these locations can be used as a natural storage tank, located within the geological spaces below ground. These storages can be utilized during the non-monsoon periods. Added benefit of facilitating artificial recharge into these Groundwater Sources, it helps to check the fast-depleting Ground water Table in our surroundings, thus Bringing Sustainability to the Sources, throughout the year. This practise translates into taking a positive step towards fulfilling the United Nations Sustainable Development Goals (UN-SDGs).

In conclusion, implementation of all Seven Components of the Modular Rainwater Harvesting System enables us to become Self-Sufficient of Our Secondary Water Requirements and Ultimately Achieve Water Abundance.