Borewell number/depth/diameter

[rocky!]

Members,

Kindly let me know as to how many bore wells will be required for a
housing complex of less than 300 apartments.

thanks

[Kavi]

The international norm is about 250 L of water per person per day . I
belive we can manage with much less, below 200 L . I think you should
take 200 L as a norm . Decide how many residents per apartment & then
calculate your total daily consumption , 1000 L per family is the
general norm . You will need to decide storage depending on how many
times a day you will pump up the tanks & pumping capacity that can do
this in 4~6 hours max will need to be installed . The efficiency of
the pump declines with time & depletion of ground water table , as
capacity declines with increasing head ( height to which water needs
to be pumped as water table depletes) . You will need to take that in
to account. 100% standby is also needed . You must alternate the pumps
every month , to keep even wear & tear. Any line filters installed
need to be cleaned regularly to lessen the load.

[Namburi]

Hi everyone
For ascertaining the no of bore wells required, one should know the
water table capacity, time to recharge,
1. Water table capacity will give a fare idea about amount of water
available in the ground at what depth and spread. This will help to
ascertain amount of water that can be pumped continuously per hour
depending up on pump capacity

2. Any bore well will reduce the water pumping out after some time,
and it requires time to recharge...may be hours or a day. In case of
apartment we should look at recharge time with in hours. Since the
requirement will be too high.

To calculate the potable water required you can take roughly 200*4 for
2 bedrooms and 200*6 for 3 bedrooms and add additional 50 -100 lit per
flat for common purpose like cleaning, landscape etc...
So for a 300 flats at the ratio of 60:40 for 2 and 3 bedrooms you need
3, 18,000 liters per day. This need to be pumped in a span of 24
hours.
Assuming that you run the motors 2 times a day every time you should
have bore wells with capacity to supply approx 1, 59,000 lts.

Usually for apartments of this scale you should go for agricultural
bores that have a huge like the above. These are the same from which
the tanker guys/bwssb supplies the ground water to many apartments.

Regards
Ar.Praveen.N
Ardes Architects and Interior Designers
ardesar...@yahoo.co.in

[prade...@hotmail.com]

In my site from the borewell i get only 400 ltrs of water per day.
should i repair this borewell or wait for the rains or should i go for
a new borewell

> ardesarchite...@yahoo.co.in

[Namburi]

Hi pradeep
I feel you should consult an expert for advice...what depth you have
the bore well?some times digging down by some more feet you can touch
the actual water table.
Cases like you happen when you stop digging just after you touch rocky
water table.In these case it takes a lots of time to recharge.As you
said ,400lits per day is very very small quantity.Hardly your needs
are taken care in it.
Some times you might have to dig a new one.Finding the water table is
a very big issue ,since the scientific way of finding it is a very
costly affair and even the failure cases in it are more than
40-50%.There are sophisticated ways of finding but then costs you a
bomb.

regards
Ar.Praveen.N
ardesar...@yahoo.co.in

[tvsh]

The above calculations assume that the borewells supply 100% water
needed by the apartments. Unless you are extremely lucky, this will be
unsustainable in the long run. You should consider meeting a part of
the water needs via some other means (RWH, Municipal supply, etc.)

> ardesarchite...@yahoo.co.in