Rainwater Harvesting

Updated Feb 2019

Rains are a major source of water for us, many rivers feed out of it. However, much of the water goes waste when we allow it to run off and enter urban drains. Hence it is extremely important to accumulate, the water through roof drains, into underground reservoirs, for use.

Rainwater can be used in gardens, in toilets, and for domestic use with proper treatment. The harvested water can also be used for storage and for other purposes such as groundwater recharge.

rwh6

Suitable for roof top area upto 100 sq.metres  

rwh5

 Abandoned/ Running Hand Pump 
Suitable for roof top area upto 150 sq.metres

 rwh4

Abandoned Dug Well 
Suitable for roof top area more than 1000sq.metres 

rwh3

Recharge Trench 
Suitable for roof top area — 200 to 300 sq.metres

rwh2

Gravity Head Recharge Well 
Suitable for roof top area more than 400sq.metres 

rwh1

Recharge Shaft 
Suitable for roof top area greater than 1500 sq.metres

 All images sourced from: Delhi Jal Board

Why Should we Harvest Rainwater?

With rapid urbanisation and the growth in population, the existing portable water supply is no longer sufficient to meet consumption needs.  According to the Delhi Jal Board, based on its present population, Delhi’s water requirement is 800 MGD (million gallons per day), while the total water supply from all sources is 670 MGD. Delhi gets most of its water from neighbouring basin states like Haryana, Himachal Pradesh, and Uttar Pradesh etc. Thus, the Delhi Govt. is limited in augmenting its water supply, leading to increased pressure on ground water.

With the receding water table, it has become all the more imperative to adopt Rainwater harvesting techniques.

Rainfall usually occurs in high intensity short spells, resulting in a run off, rather than recharging the ground water levels. Rainwater harvesting helps chanelise this runoff water, and store it. Rainwater is bacteriologically pure, free from organic matter and soft in nature. Moreover, it can be used to recharge the ground water levels  . Another advantage of rainwater harvesting is to reduce the . In fact, rainwater harvesting systems have been put in place in Chennai, and the Delhi Government has taken inspiration from them.

According to rainwaterharvesting.org:

Potential of rooftop water availability in National Capital Territory of Delhi

Roof Area in Sq.m Annual rainfall in (litres) Quantity of rainfall available for harvesting (litres)
50 30,550 18,330
100 61,100 36,660
500 305,500 183,300
1000 610,000 366,600

(Note: a.Annual average rainfall of Delhi=611 mm; b. runoff coefficient is assumed as 0.60;Sq. m to be read as square metre)
An analysis done based on the rainfall availability and demand supply gap shows that even 50 per cent of the rainwater harvested could help in bridging the demand supply gap.

What is the state of the Ground Water Table in Delhi?

A graphic published in the Times of India in May 2018 showed the following figures:

Neighborhood Depth to water level(m)
Dwarka 21.92
Kapashera 79
Mehrauli 78.1
Mayapuri 37.36
Janakpuri 12.9
Vikaspuri 15.62

A previous article in the Hindu dated August 2014, suggested the state of Ground water is dismal, especially in south and south-west Delhi. Here are some facts and figures from the article, to give you and idea.

Region Depth to water level(m) Area in sqkm
Central, North-West, North 0-2 3.8
South District 40-45 68
New Delhi, East, South-West, North-West 5-10 287
South West, New Delhi 10-20 410
South-West, South, New Delhi 20-40 247
East 2-5 465

What is the Delhi Jal Board mandate, what have they asked homes to do?

Considering the gap in supply and demand of water, and the ground water levels in some areas, the Delhi Jal Board has made it mandatory for all existing residential with an area of 500sq m and above, to install rainwater harvesting systems. There are around 10 areas where groundwater levels are reasonably high. Vetted by the Central Ground Water Authority , these areas will not be required to carry out RWH. These include Okhla, Siddharth Extension and Jahangirpuri.*

What effort does it take to Maintain a Rain Water Harvesting System?

Estimates suggest the cost of maintaining your rainwater harvesting setup could be of the order of Rs. 5k per year. You should get your tank cleaned 1-2 times a year based on the rainfall season in your region. Also make sure the inlets are not blocked with waste which could impede the flow of water. You could also use alum in the water to help the dust settle down to the bottom in order to make the water clearer for use, however ensure that you don’t use the water for cooking or drinking in that case.

 

If you’re looking to implement rain water harvesting in your Delhi home, BuildingBlox can help. Please fill the BuildingBlox Rainwater Harvesting Form and we will contact you.

*For  more details on the Rain Water Harvesting Mandate, do lookup the Delhi Jal Board website https://djb.gov.in

Things to keep in Mind While Waterproofing your Washroom

    Washrooms are one of the most important parts of every construction project. They are no longer those secluded parts in the corner of the house, but instead are used as areas of leisure and relaxation. And it is quite obvious that bathrooms are the most prone to moisture related mishaps so special attention must be paid to waterproofing it appropriately. Here are some things to keep in mind as you supervise the waterproofing of your bathroom.

Bathroom Flooring

Flooring:

    Use antiskid tiles on the floor. It is always a good idea to use wide grout lines between the tiles and seal the grout lines annually, so that water doesn’t seep through them. Another important aspect of bathroom flooring is the uninterrupted slope towards the drain so that water doesn’t accumulate in pockets.

Bathroom Walls

Walls:

    The wall behind the shower panel, the part under the sink and the area behind the water closet, are most prone to mold and mildew, it is therefore a good idea to use tiles on the washroom walls as well. Use the Dr. Fixit Bathseal kit to protect your walls, floor, and sanitation areas.

Bathroom Ceiling

Ceiling:

    Ensure that your washroom ceiling is coated with waterproof paint so that it doesn’t absorb moisture.
Always ensure that there is enough ventilation and an exhaust fan in the bathroom so that moisture doesn’t stay. Also ensure that the joints in the plumbing and faucets are sealed properly; and, we repeat, the slopes on the floor direct the water straight to the drain.

    In fact, they Waterproofing is an extremely essential part of every construction project as the lack of it, or inadequacy of the same, can cause moulds to fester, seepage, and ultimately weaken the walls.

    Different types of waterproofing materials are used in the building industry. In order to obtain satisfactory performance, it is essential to apply the water-proofing treatment prior to laying the tiles and special care has to be taken to carefully preparing the building sub-surface so that it can receive the treatment as recommended.

    It is essential to ensure the water-tightness of the structures so that the flow of water from inside the structure to outside (in case of swimming pools), and the infiltration of water from the surrounding soil into the structure are effectively prevented.

    Have a look at our growing database of waterproofing products and have a look at some amazing bathroom images on our pinterest page to inspire you to start designing your dream bathroom today.

 

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