It is appreciated If anybody can help answer how to estimate the quantity of groundwater in a particular region, or group of regions. Links and a description of methods to evaluate the ground water quantity in a particular region or regions much appreciated.
Thanks in advance
You have answer there:
https://thewaternetwork.com/question-0-y/how-we-can-calculate-or-estimate-the-quantity-of-ground-water-available-in-a-particular-region-qy6nMXGE4qAdYGxtzKQsUg
http://water.usgs.gov/edu/gwhowtofind.html
There is much on internet. It is best to hire experts for this or get the training. I am sure there are several books. If self training is desired, try to also interact or collaborate with geologists, hydrologists, and well drillers. Alot can be learned from recorded well data, including pumping results.
Usually recharge is the most difficult parameter to be determined. You need to pay more attention to this when using existing standard methods. Good Luck!
This needs to identify the areal extent of the aquifer and its depth. In this case, you will have the rock volume, which must be multiplied by the rock porosity ration.
There are many different methods, depending on scale and availability of data. One older method was a regional flownet analysis using a mean or range of transmissivity and hydraulic gradient values.
Another example is estimation of regional budgets. For example, in Nova Scotia we have available an open file illustration of estimation of regional groundwater budgets, see web page:
http://novascotia.ca/natr/meb/download/mg/ofi/htm/ofi_2010-002.asp
When issuing approvals for withdrawals, the province only allows a maximum of 50% of the available, on a first come, first served basis. See the guide for groundwater withdrawal approvals and water allocations on:
http://novascotia.ca/nse/water/withdrawalApproval.asp
For a smaller area, such as a subdivision, methods can vary from an areal basis to groundwater modelling. See webpage:
http://www.novascotia.ca/nse/groundwater/
Scroll down to publications and look at:
Guide to Groundwater Assessments for Subdivisions (PDF) and
Groundwater Toolkit (xls).
Though the norms to estimate the quantity of groundwater recharge are area specific but may be the attached file help you to understand the process.
Article ESTIMATION OF GROUND WATER RESOURCE OF GURGAON DISTRICT, HARYANA
Definitely it is important to consider spatial and temporal scale, climate is an important issue. The quantity will depend on the objectives you have to calculate it.
If you need the recharge different methods need to be applied. If you need the aquifer storage more research is needed and if you need quantify for exploitation, water management will be necessary to define the sustainable quantity of water for extracting on the aquifer.
Like any water balance approach, the groundwater balance is also worked out. There are region specific methods or approaches. You may refer to the attached article for some ideas.
Many experts have already given suggestions on the topic. Here are some more points for your consideration:
1. First you have to select a watershed to quantify the groundwater
2. Through the application of geological, hydrogeological, remote sensing and geophysical methods try to determine :
a) Types of rocks and their geometry/areal extent; structural details such as fractures/faults/unconformities/super positions, etc.
b) Hydraulic properties such as porosity, permeability, etc, of various rock types in the study area & Classify the rock types as Aquifer/Aquiclude/aquitard
3. Collect details of rainfall, groundwater fluctuation, groundwater utilization pattern and draft
4.Apply the water balance equation to quantify the Groundwater.
Article Evaluation of Groundwater Development Prospects in Kadalundi...
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