Dear Rudra, I think there is no simple answer beside it depends on what you want to know about the aquifer. If you want to know about baseline flow then I would suggest to take pre monsoon (I assume this is not the recharge season). If you want to know about high flow regimes (i.e. for pollutant transport) then I rather would go for situations with higher gradients (which I would assume during/after monsoon season). For modelling the aquifer behavior I would suggest to do the testing under different conditions anyway. So you see there is not the answer...

Cheers Peter

Dear Peter,

Thanks for the info. I am interested to know the recharge behavior and its storativity  of the aquifer.

-Rudra

Dear Rudra, looking at your last comment, I think you answered your question yourself. What you need is an aquifer understanding at any time. Anyway I am aware of two papers which you may find useful (Marechal et al., 2004: "Use of hydraulic tests at different scales to characterize fracture network properties in the weathered-fractured layer of a hard rock aquifer" and Guiheneuf et al. (2014): "Groundwater flows in weathered crystalline rocks: Impact of piezometric variations and depth-dependent fracture connectivity"). In both hydraulic testing in India are described. Maybe you get in contact with them. Cheers Peter

Hello Rudra

I agree with comments above by Peter Achtziger-Zupančič. For water supply purposes, it is good to have the estimates at low flow to give a more conservative sustainable yield, but you also need to know the variation or 'envelope'. Should some water-bearing fractures become dewatered (seasonally or with pumping), the yields can change significantly. The value you use for available drawdown can partially take this into account. In one pumping test in granite bedrock, I saw a difference in whether the water level stabilized or not with a change in pumping rate of 0.1 igpm, which is highly sensitive.

Hope this helps.

Hi Rudra

I agree with the earlier answers and want to add few things.

1. The aquifer is fully saturated after post monsoon and has minimum saturation in summer months.

2. Granite behaves as an aquifer because of the presence of secondary porosity so it is very important to understand the degree of weathering, fracturing and jointing at various places.

3. Accordingly, the representative wells can be selected for pump test. The pre-monsoon data would help you for Aquifer Characterization and understand the specific yield, storativity and transmissivity of granite aquifer.

to know the recharge behavior and storativity of the aquifer, it is better to conduct pumping test after monsoon because the granitic aquifer quickly responds to recharge after monsoon event.