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Stage of Development
The stage of development was
computed based on the following formula ;
S.D = (B/A) x 100 where
S.D. is the stage of
development
B is the gross ground
water draft for all uses
A is the annual net
ground water available
Net Ground Water Available for Development
This is calculated after deducting the gross ground water draft
from the annual net ground water available.
Categorisation of Blocks
During the earlier
computations the blocks were categorised as White, Grey and Dark.
The present methodology recommends the blocks be categorised as SAFE,
SEMI-CRITICAL, CRITICAL and OVER-EXPLOITED. For the present
categorisation of blocks apart from the stage of development, the
long-term ground water level trend is also taken into account. The
norms recommended are as follows ;
Safe :- The stage of development is less than 70% or but less than
90% and either pre- or post-monsoon shows a significant long term
decline.
Critical :- The stage of development is more than 90% but less than
100% and either pre- or post- monsoon shows a significant long term
decline.
Or
The stage of development is less than or equal to 100% and water level
trend of both the seasons show falling trend.
Or
The stage of development is more than 100% and either pre- or
post-monsoon does not show a significant long-term decline.
Over exploited: - The stage of development is more than 100%
and the water level trend of both the seasons are showing falling trend.
Precautions to be taken
There is no restriction for future development in the safe blocks. In
the semi-critical blocks future development shall be done with caution.
The recharge estimate shall be done with greater accuracy and the ground
water level trend has to be analysed critically with greater accuracy.
There is also marginal scope for future development in the critical
blocks. In these blocks, the density of the NHS shall be increased.
There should be intensive monitoring, evaluation and the future ground
water development is linked with water conservation measures. Water
conservation and artificial recharge structures have to be constructed
and micro level studies have to be carried out. In the over- exploited
blocks, there is no scope for future development and all the
studies/structures recommended for critical blocks have to be carried
out here also.
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