Reliability of water supply from stormwater harvesting and managed aquifer recharge with a brackish aquifer in an urbanising catchment and changing climate

摘要: Recent research shows stormwater harvesting with Managed Aquifer Recharge (MAR) and complementary treatment can deliver safe potable water supplies. To address supply reliability the "WaterCress" hydrological model was used iteratively to simulate runoff, recharge recovery for different rainfall, catchment aquifer conditions, operational scenarios based on Parafield scheme in Salisbury, South Australia. Using historical rainfall current operating annual demand equating 12.8% of could be met 99.5% volumetric reliability. projected rainfalls from a high emission climate scenario resulted smaller harvestable volume decline than increase expected urban consolidation. Freshwater storage depletion brackish reduce by 10% compared zero depletion. This simple generic modelling approach useful estimating MAR systems assist planning design provide basis investor confidence. Annual reliability.7% less under change reduced 3%.20% impervious area 8% more supply.Increased volumes through urbanisation would offset effects change.Aquifer losses mixing due short times.