Digital elevation model of Patancheru areaPatancheru Bolaram Hyderabad
Geology and groundwater flow of Patancheru area 490 S S # # SS ## U % U % 500 U % UU U %% % 550 540 580 U % 510 530 520 S # S S # # SS ## S # U S S # S S # % # # U UU SU % %% # % U % U % U % U % U % U % U U U% % S # % U % S # UU U %% % U % U U % % U % U % U %
Shallow alluvialcoverage overweathered granites inthe river bed of Nakkavagu near AratlaHigh infiltrationrates/risk ofcontaminant leachingto the alluvial aquifer aswell as to the fracturedaquifer
in f ilt r a tio n o f t h e p r e c ip ita tio nRecharge area a r e a o f in filtr a t io n e xDischarge area Variability of the ground Decreasing permeability filtr a t io n a r e a s u rfa c water flow field caused by e o f f is young s u re w a te r s p r in g faults, fracture zones w a te rd e c r e a s in g p e r m e a b ilt y r e c e iv in g b o d y Downward groundwater flow o ld w a te r in the recharge area Upward groundwater flow t ig h t c r y s ta llin e in the discharge area s c h e m a tic s k e tc h o f th e h y d r o lo g ic flo w fie ld in c r y s ta llin e r o c k s
Aquifer CharacteristicsLateral aquifer extent 400 - 600 mAlluvial aquifer thickness 8 -10 mDepth of the water table 2- 6 mDischarge rates about 1.1 liter / secUnconfined and semiconfined aquifer conditionTransmissivity in weathered and fractured granite aquifer:30 - 60 sqm/day ( 3.5*10E-4 m²/s to 6.9*10E-4 m²/s )up to 400 sqm/day in isolated patches (4.6*10E-3 m²/s)Transmissivity in the alluvial aquifer along the Nakka vagu river:130 - 1300 sqm/day (1.5*10E-3 m²/s to 1.5*10E-2 m²/s)The average annual seasonal fluctuation of the ground water table is about 3 metersand close connected to the rainfall pattern.
Main contaminants:Toxic metals and organic compounds:Arsenic - surface water & ground water up to 0.7 mg/l (0.01 mg/l)Selenium - up to 0.038 mg/l (0.01 mg/l)Strontium - up to 3.0 mg/lBarium - up to 0.20 mg/l (0.7 mg/l)Boron - up to 4.0 mg/l (0.5 mg/l)Manganese - up to 1.5 mg/l (0.05 mg/l)Nickel - up to 1.0 mg/l (0.02 mg/l)