Rainwater Harvesting

Small and marginal farmers are most affected from water stress situations, and need simple, sustainable and effective measures for water conservation and management.

National Rainfed Area Authority (NRAA) has been created to harness and harmonise tremendous potentials of the rainfed agriculture by converting weaknesses into strengths and threats into opportunities by appropriate policies, programmes, professionalism, capacity building, monitoring and evaluation.

These are some of the questions which led Tarun Jayaram, the film-maker to explore traditional water systems in the country. From the documentary’s opening moments, the director engages us with a beautifully shot array of footages ranging from pilgrims taking a holy dip of Ganges to beautiful baolis and tankas of Rajasthan to the ancient town of Hampi in Karnataka, while establishing how rivers have been an integral part of Indian culture and how its rich tradition of harvesting rainwater needs to be re-established to deal with the present day water crisis. Over the refreshing images and soothing audio, it advocates the need for community participation in rejuvenating the traditional methods of rainwater harvesting. 

The Rainwater Harvesting Policy (2006) for Karnataka state has evolved out of the need for conserving rainwater and providing facilities for rainwater harvesting, in the context of the growing rate of urbanisation in the state and the rapid depletion of groundwater resources, leading to a water crisis.

The objective of the urban rainwater harvesting policy is to ensure that the available water is put to best possible use in the state by encouraging involvement of  multiple level of stakeholders such  as government and private institutions as well as  citizens, in the appropriate management of rainwater.

Overview

It is surprising that fluoride was found even in surface water bodies like ponds, because fluoride is generally found in deep aquifers. Fluoride is a naturally occurring mineral in the deeper layers of rock beneath the earth's surface, so it was unusual to find it at such high levels even in surface water sources, leading to the conclusion that intensive agriculture in the area has spread the fluoride to the surface.

As the elevated tracks come up over the city a mass transport network called the metro is being built all over the city. In phases it is likely to cover over a 100 kilometre and become one of the prime modes of transport to the city. Apart from the transport benefits it will bring to the city there is one other potential benefit that could accrue to the city due to its construction.

The metro rail track offers a tremendous potential for rainwater harvesting. A total length of about 45 kilometres and a width of about 12 metres mean that the endowment of rainwater on the relatively very clean track with Bangalore’s rains of 970 mm annually is about 523 million litres. Considering a coefficient of runoff of 0.90 the harvestable rainwater is around 471 million litres annually. This could provide about 13,000 people with their annual requirement of water at 100 litres per day. A substantial sum.