top need bore depth cracks Contact chamber terrain storage minimum material presence aquifers silt trap life span recharging multilayer five years dry joints soil strata replacement twenty years Provisioning More Details water column moving parts deeper layers water channel The Rain Water overflow water low lying areas percolator pipe maintenance cost large quantities Filtration media upland conditions enormous quantity groundwater source Geo physicals data dual V-Wire Screen maximum flexibility ground water source significant volumes periodic maintenance semi impervious earth Rainwater Harvesting System Allegiance Water Management Non Clogging V-Wire screens vertical electrical Sounding Horizontal V wire Screen Filter V’ Wire Injection Well Technology Gravitational Principal Geomorphic profiling