rs 90 staggering 10 reached 10 25 metres 15 metres april 1 15 metres asper fivemetre decline regulated alternative fixed rate 110 villages covered improve access excessively drawing nondrinking purposes ro plants transfer control major expense 110 villageshave recorded science iisc indian institute urgent push borewell usage dh report raised alarms bengaluru braces bwssb making bwssb shows levels dropping hike rates severe drop citys outskirts cauvery stage drinking water water tankersalready bwssb officials water crisis groundwater levels april tanker costs severe groundwater crisis potential crisis bengaluru witnessing depletion rates april bwssb ahead outskirts prompting bwssb bengaluru water tankers developed allowing residents urging apartment residents core city areas falling groundwater levels avoid shortages bengaluru sewerage board bwssb cauvery water connections skyrocket officials warn water meter readers ensure judicious water water supply plan bangalore water supply tightening water regulations early march providing face penalties additionally sole agency responsible tankers stricter monitoring ramprasath manohar stressed recent collaborative study harsh summer authorities