2024-05-30T11:30:07
When it comes to borewell drilling services for piezometers (observation wells), there are specific guidelines and considerations to ensure compliance with regulations. Let’s explore the details:
Piezometers and Their Purpose:
A piezometer is a borehole or tube well used exclusively for measuring water levels. It allows accurate monitoring of groundwater behavior and aquifer characteristics.
Piezometers are essential for assessing the piezometric head (water pressure) at specific depths within the aquifer.
Installation Guidelines for Compliance:
The Central Ground Water Authority (CGWA) provides guidelines for installing piezometers to comply with NOC requirements.
Here are the general guidelines for piezometer installation:
The piezometer should be installed at a minimum distance of 50 meters from the pumping well that abstracts groundwater.
The diameter of the piezometer should typically be 4 to 6 inches.
The depth of the piezometer should match that of the pumping well from which groundwater is being abstracted.
If multiple piezometers are installed, the second one should monitor the shallow groundwater regime, facilitating monitoring at different depths.
Measurement frequency should be monthly, with accuracy up to centimeters.
Water level measurements in the piezometer should be taken only after pumping from surrounding tube wells has ceased for about four to six hours.
The coordinates, reduced level (with respect to mean level), depth, zone tapped, and assembly details must be provided for inclusion in the National Hydrograph Monitoring System.
Groundwater quality should be monitored twice a year during pre-monsoon (May/June) and post-monsoon (October/November) periods. Quality analysis can be done by NABL-approved labs or GWD Analytical Labs.
A permanent display board should be installed at the piezometer site, providing location, piezometer/tube well number, depth, and tapped zone for standard referencing and identification.
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