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Appendix D - Acid Sulphate and Dewatering Managment Plan · OPW23/0179
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Cone of Depression calculator This tool can be used to calculate the groundwater cone of depression in potential acid sulfate soil areas. Last updated: 2 May 2023 Related page Preliminary assessment of the radial extent of the cone of depression and pumping rates and times for all Acid sulfate soils dewatering operations is critical for assessing the risk of disturbing acid sulfate soils in potential acid sulfate soil areas Provided by Broad-scale acid sulfate soil risk maps for several coastal regions of WA are accessible via Data WA Department of Water and Environmental Regulation Empirical methods to calculate the radial extent of the groundwater cone of depression and pumping rates and times for dewatering operations are outlined in National Acid Sulfate Soils Guidance: Guidance for the dewatering of acid sulfate soils in shallow groundwater environments (3 oe ino in Calculator Input Length of excavation 20 metres Width of excavation metres Drawdown required: 2.1 metres Aquifer thickness'") metres Hydraulic conductivity: 0.0000949 metres/second Results Effective pumping radius, R. 8 metres Cone of depression radius, R, 61 metres Total pumping rate 6 |litres/second Pumping time required 62 hours
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