Solar Water Pumping Systems for Rural drinking water projects
Submitted by hvjoshi on February 2, 2010 - 16:29
We design, supply and install solar water pumps.
we think that it is possible to run such pumps when accessibility to grid is poor, not known, absent, perhaps solar water pumping are a solution.
however it is not easy to estimate the bore/ground water yield.
pl suggets low cost methods to make such assessments.
Comments
1. Estimating the yield of a bore well
Dear Mr.Joshi,
On the indiawaterportal is an excellent FAQ on Bore wells which is an excellent source of information on bore wells.Usually the agency/party that drills a bore well is supposed to do the work of establishing yield and also the amount that can be pumped out in terms of litres/minute or lits/hour and the volume of water than can be pumped out before shutting off the pump.They also recommend the recovery time when the water should not be pumped out so that the water fills in from the acquifer.I have seen many such reports from the well developer/driller.
In your case at what stage do you come in? When you do get involved/called in, ask for the report on the well depth,yeild, etc. there are no low cost methods of doing this as far as I know.
S.S.Ranganathan
2. Solar Water Pumping Systems
Mr Joshi,
If you have the proper bore well record you probably have the yield of the well, i
f not you could do it using this practical method-
just install any pump check the water level and pump out the water, if the well goes dry,
stop wait for an hour and start the pump once again and ensure that you measure the water being discharged.
when the pump runs dry again, check the time the pump ran for the second time.
and the quantity of water you have pumped out
this is the water that is is coming in to the well in the time which is equal to 60 + the minutes after the pump was restarted till it ran dry again..
In the second case , if you are lucky and IF it does not go dry, and you get steady state conditions, I would suggest that you check the pumping water level
( physical measurement or estimate it from the discharge available) By this you get the total draw down achieved at a particular rate of pumping.
calculate how much more of a draw down you can achieve and you will be able to calculate the discharge per hour to achieve that depth of pumping. this gives you the yield - in pumping rate of the well.
If you cannot manage this, then you should think of some agency which is technically capable of doing it for you.
Regards
Dr. Anil Lalwani
www.wellwaterworks.com
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