1,1,1-trichloroethane Environmental science, engineering & technology InSAR Semarang City Technology: general issues accidental wetland agriculture backfill baseflow bioretention catchment cement-bentonite-water ratio chalk aquifer cutoff walls degradation developing cities drainage drought full-scale testing green infrastructure groundwater groundwater abstraction groundwater flow groundwater modeling groundwater policy groundwater quality hazards headwater stream hydrochemistry hydrogeology