Monday, 26 December 2016

Harvesting Rainwater for your Gardens and Yards

We have all heard about the prolonged drought in California. While some places experience low stream flows, others suffer seasonal dryness.

Even if you live in a state that is safe from elevated drought levels, your city or state may require you to restrict use of water as a precautionary measure. One major method of preservation of natural resources is rainwater harvesting.

Benefits rainwater harvesting

There is no wealth to match the bounty of the rain god. After an inch of rainfall, you gain almost 900 gallons of water from your barn or house if the structure is 30 x 50 feet.

Rainwater is healthier as it has no trace of any of the chemicals that you normally find in tap water. You can collect it very easily and use it to water your indoor plants, and garden, and do anything else that is beyond the essential needs.

One of the simplest ways to harvest rainwater is to install a water diverter on the current downspout of the gutters, and keep there a container for water storage beneath the downspout. You can easily do this for your house.

Different ways of rainwater harvesting

Surface runoff harvesting

Local authorities can construct a well-planned network to save every drop of runoff water and utilize it for recharging aquifers for the entire city.

Rooftop harvesting

This is a system of saving rainwater from where it falls first on a city: the roof is the catchment area here. The water thus collected can either be stored in a tank or sent to an artificial recharge system. The method is a lot less expensive and extremely effective; if implemented properly it helps augmenting the ground water level.

Rainwater collected from the rooftop should be directed down via water pipes or drains to the harvesting/storage system. The pipes must be UV-resistant. Water from roofs can also be channelized through down take or gutter pipes. The mouth of every drain on the terrace should have wire mesh to filter floating material.

First flush is an instrument that serves to get rid of the water collected during the first shower. It is necessary to do this in order to avoid any form of contamination of rechargeable/storable water due to possible atmospheric contaminants.

This helps as well to clean silt and other forms of dirty material deposited on the roof over a period. Provisions for a first flush rain separator must be made at the mouth of every drainpipe.

Harvesting through percolation tanks

Percolation tanks are surface water bodies created artificially, immersing a land area with acceptable permeability; this provision enables sufficient percolation for recharging the ground water. Such tanks are created in big campuses where plenty of land is available and the geography is suitable.

Most of us take water for granted and overuse it without any thought of a terrible water crisis that is slowly building up. A day might come sooner than later when life on earth may face a serious threat in the form of unprecedented water scarcity.

Rainwater harvesting is one of the most cost-effective and necessary steps to ward of this situation, and try to maintain water availability at normal levels.