cm Mob NOC day Unit data year AWLR case CGWA CGWB depth pumping periods Mail id monsoon sounder minimum diameter May/June Borewell accuracy compliance measurement A Piezometer installation 50 m distance 10,000 liters The Piezometer allegianceindia one Piezometers October/November four to six hour government norms telemetry system second Piezometer general guidelines measuring frequency groundwater quality water quality testing Allegiance Enterprise groundwater withdrawal surrounding tube wells No Objection Certificate shallow groundwater regime Central Ground Water Board Allegiance Water Management Automatic Water Level Recorder other water management services