46c38ade-0c86-47c7-99a3-c6a3501a7529 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T16:40:20 creation ISO 19115 2016 Chloride Mass Balance recharge estimation, points dataset, McBride and Nulla basalt provinces 46c38ade-0c86-47c7-99a3-c6a3501a7529 This dataset includes point estimates of groundwater recharge in mm/year. Recharge rates have been estimated at monitoring bore locations in the basaltic aquifers of the Nulla and McBride basalt provinces. Recharge estimates have been calculated using the “chloride mass balance” method. The chloride mass balance process assumes that the chloride ion is a conservative tracer in precipitation, evapotranspiration, recharge and runoff; and that all the chloride is from rainfall, instead of for example halite saturation or dissolution processes. So the volumetric water balance and the flux of chloride balance must both be true. Assuming that runoff and evapotranspiration are negligible (so approximated by zero), the equation is simplified: Water balance P=ET+R+Q Water balance multiplied by chloride concentrations (chloridefluxbalance) P∙Cl_ppt=ET∙Cl_ET+R∙Cl_gw+Q∙Cl_riv | ΔCl_reac≈0 Assumptions to simplify equation P∙Cl_ppt=R∙Cl_gw | Q≈0 & ET≈0 Rearranging for recharge rate (unknown) R=P∙(Cl_ppt)/(Cl_gw ) | Q≈0 & ET≈0 Where P = precipitation rate; ET = evapotranspiration rate; R = recharge rate; Q = runoff to streams; Clppt = concentration of Cl in precipitation; ClET = concentration of chloride in evapotranspiration; Clgw = concentration of Cl in groundwater; Clriv = concentration of chloride in river runoff; ΔClreac = change in chloride concentrations from reactions. {"type": "Polygon", "coordinates": [[[143.5, -20.3], [145.3, -20.3], [145.3, -17.7], [143.5, -17.7], [143.5, -20.3]]]} 143.5 145.3 -20.3 -17.7 Australia Chloride Mass Balance EARTH SCIENCES EFTF Exploring For The Future McBride Basalt Nulla Basalt Published_External QLD Queensland Rainfall Recharge UB Upper Burdekin Web Service ESRI File Geodatabase (zip) [31kb] documentDigital ESRI File Geodatabase (zip) [31kb] ZIP Upper Burdekin Chloride Mass Balance Recharge MapServer documentDigital Upper Burdekin Chloride Mass Balance Recharge MapServer HTML Upper Burdekin Chloride Mass Balance Recharge WMS documentDigital Upper Burdekin Chloride Mass Balance Recharge WMS WMS