Tuesday, April 24, 2012

Rainwater harvesting...by Green Yatra

Rainwater harvesting is the accumulating and storing of rainwater. It is used to provide drinking water, water for livestock, water for irrigation and also to refill aquifers in a process called groundwater recharge. Rainwater collected from the roofs of houses, tents, and local institutions can make an important contribution to the availability of drinking water. Water collected from the ground, sometimes from areas that are especially prepared for this purpose, is called stormwater harvesting. In some cases, rainwater may be the only available, or economical, water source. Rainwater harvesting systems can be simple to construct from inexpensive local materials, and are potentially successful in most habitable locations. Roof rainwater can be of good quality and may not require treatment before consumption. Although some rooftop materials may produce rainwater that is harmful to human health, it can be useful in flushing toilets, washing clothes, watering the garden, and washing cars; these uses alone halve the amount of water used by a typical home.
There are a number of types of systems to harvest rainwater ranging from very simple to the complex industrial systems. The rate at which water can be collected from either system is dependent on the planned area of the system, its efficiency, and the intensity of rainfall (i.e. annual precipitation (mm per annum) x square meter of catchment area = liters per annum yield). For example, a 200 square meter roof catchment catching 1,000mm PA yields 200 kLPA.

Make Rain water harvesting a necessity for all houses and offices in urban cities.
Urban cities in India are facing dual problems. First, they face acute shortage of water during the first half of the year, and then face the flooding of streets during rainy seasons due to improper and inadequate drainage systems. Some cities in India like New Delhi and Bangalore have incorporated rain harvesting policies in their state policies. However, what remains a fact is that rain water harvesting is not widely acknowledged across most other major cities. The ill-organized drainage systems do not trap surface water and most of the surface water flows into drains and therefore there is not much recharging of the under-ground water.

Rain water harvesting comes with many benefits
1.    Provides an ideal solution in places where the ground water level is low or there is inadequate surface resources to trap the ground water.
2.    Reduces urban flooding
3.    Improves quality of ground water
4.    Prevents water stagnation
5.    Prevents wastage of water
6.    Improves plant growth
Mentioned below are few low-cost measures that would cost just a few thousand rupees and is quite affordable for urban citizens
1.    Bore wells
2.    Pits
3.    Trenches
4.    Dug wells
5.    Water Tanks

visit www.greenyatra.org for more notes and information


  1. In addition to your list of benefits of rainwater harvesting it is also an excellent source of good quality water. :D Another main benefit we can get from this water conservation system is the large volume of water every household in a society can save per day - approximately 200 liters. What really big savings we can get from this, right?

    Tabatha Tidd

  2. Thanks for sharing this blog.it's really a great work done by you. we are also in same business providing the best solutions for rain water harvesting in India.

  3. Water is essential factors in life. so to make available the water for the survival of human beings rain water harvesting is very important. Thanks for sharing such a nice blog with us.
    rain harvesting

  4. We had the limited sources of water for survival of human beings. so it will be very needful to save the rain water and use it carefully.for rain water harvesting techniques visit rain harvest.

  5. Great post, Thanks for sharing such a nice post with the benefits of rain water harvest. I found your blog very informative and useful.so thanks green yatra for sharing your Knowles.