Geology Reference
In-Depth Information
(
Contd
.)
Geologic Age
Stratigraphic Unit
Rock Formation
States/Hydrogeological Characters
Unconsolidated Formations
The deeper confined aquifers generally occurring below
200 to 300 m depth have low storativity (0.005 to 0.0005)
and transmissivity (300 to 1000 m
2
/day). Highly
productive aquifers yield up to 67 lps and above. The
potentials of peninsular rivers alluvium are rather moderate
with yield up to 14 lps. But the alluvial valley fill deposits
of Narmada, Tapi, Purna basins, 100 m thick, sustain
yield upto 28 lps. The quality of ground water at deeper
level is inferior. (Storativity 4 × 10
-6
to 1.6 ×
1.0
-2)
and transmissivity 100 to 1000 m
2
/day). Thick
alluvial sequences in deltas of major rivers on the eastern
coast and in Gujarat estuarine tracts. Hydrogeological
potential is limited by salinity hazards.
(e) Aeolian deposits
(sandstones)
(e) Very fine to fine sand and silt.
The aeolian deposits occurring in West Rajasthan, Gujarat,
Haryana, Delhi and Punjab have moderate to high yield
potentials; are well sorted and permeable; lie in arid
region; natural recharge is poor and water table is deep.
(
Source:
CGWB, 1995)
