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Concept

Product Details

Specification

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How it works

Roof Top Water Collection and Recharge

Availability of rain water from roof top is so high in the urban areas and if properly diverted and used, artificial recharge will not only increase the groundwater availability, but also help in reducing the water scarcity problem of cities and towns.

Commonly run off water from roof top are let off into the drains. Instead of this, the outlets can be connected through a pipe to a storage tank and let into gravel filled trenches, pits or existing open wells/borewells etc., to serve as recharge points.

This method is less expensive and very effective and if implemented in good spirit by each house/housing society, will help in augmenting the groundwater availability of the area.

At this juncture, measures are to be taken up by various Governmental and non-Governmental organisations as well as the public at large, so as to harvest the rainfall and maintain groundwater balance. Such measures will help to have reliable and sustainable groundwater resource for supplementing the domestic and industrial water supply needs of urban area.

How to fit

Calculation of Roof Flow Loads

When designing drainage system for roofs, it is necessary to find out the level and frequency of rainfall intensity for the location of building concerned. Due to nature of our climate, it is not possible to ensure complete safety from flooding, or overview. However it is generally satisfactory to design a rainfall intensity of 75mm/hour where overflow will not cause damage within building i.e. eaves gutters.

Allowance for the effect of wind is not required when designing for horizontal surface or other surfaces protected from wind by nearby objects. However, an allowance should be considered where slopping or surface occurs that are freely exposed to the wind. One method for calculating the effective roof area, which takes into consideration the effects of wind, is shown below.

Calculation of effective roof area to determine the effective roof area which allows for contribution factor.

I.e. horizontal span of slope + half-vertical rise between eaves and ridge x gutter length. To calculate this in square meters:

1. Measure A, B & C in meters.

2. Use (A + (B/2)) x C = effective roof area in meters

To calculate flow in liters/second for 75mm/hour intensity, multiply effective roof area (m) by 0.0208.

Direct recharge of the aquifer through open wells will be an easier and less expensive process in the shallow aquifer region. The rooftop run off water can be directed into open wells through pipes and setting pit, to avoid possible turbidity.

The borewells used for groundwater drawl can also be used for recharge with a valve control between storage tank, settling pits and borewells. In addition to run off from roof top part of run off from paved and other open area, can also be diverted to the recharge pits/trenches.

The rainwater from the rooftops can be used directly for washing purposes and for storing the water temporarily in settling sumps for later use. This method is less expensive but more effective. Industries, multi storied buildings and government organisation can implement it, as they depend mostly upon groundwater sources for all purposes

How it Fits

Table Top & Side Rafter Brackets fittings

Installation of Gutter

Gutter Fitting Design

Fixing on roofs directly

Rafter Brackets