Availability of Thumbrule Values and Soil Permeability Data for RWM planning
Submitted by adhairya on January 13, 2010 - 18:38
I have seen several post about the availability of rainfall data (monthly / yearly). I am looking for some thumbrule values for rainfall intensity (average and max) and soil permeability in the following locations. Any help is greatly appreciated.
Delhi NCR
Gurgaon
Bangalore Rural
Coimbatore
Chennai
Pune
Mumbai
If there are any sources for the same (other than IMD) please let me know.
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1. Dear User, As such there have
Dear User,
As such there have no answer regarding the question i.e. "thumbrules...."
Similar query was raised earlier by a user in the past. You can refer the responses at this link: http://indiawaterportal.org/ask/9101
With regards,
Dr. Anita Bhatt
WES-Net India
New Delhi
2. Thumbrule Values
Dear User,
For Rainfal data, IMD is the best and most reliable source, more over they have a standard grid of collection stations, which would be lacking with any other provider of this data ( if any).
As regards the permeability data, the only thumb rule would be to the soil /lithological set-up and cannot be applied to areas in genral.
If you have a high resolution soil/lithology distribution map of the area- say 1:10000 scale ( highly improbable) , you could then use the range of permeability values for the soils and come up with an average permeability value.
If you understand anything about soils/lithology you will realize that the material changes over short distances. Even if you are within the similar lithological set up.
To make things a bit more difficult the water table conditions ( field saturation conditions) do have a major control on the permeability values.
My advice to you is to forget about generalizations where it comes to specific and applied topics, Rainwater harvesting included.
Unfortunately, in trying to promote and popularize RWH, we have diluted the adverse effect that a generalized data set can have in some thing like this.
I hope that you do not resort to using any such thumb rules especially when it comes to some thign as important as Rainwater Harvesting.
Regards
Dr. Anil Lalwani
www.wellwaterworks.com