Reference Document Dewatering Plan 28_9_2023 OPW26_0094 · OPW26/0094

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

Preliminary assessment of the radial extent of the cone of depression and pumping rates and times for all Related page
sing the risk of disturbing acid sulfate soils in potential acid sulfate

 

vat s is critical for a: i i
dewatering operations is critical for a Acid sulfate soils

soil areas

 

Broad-scale acid sulfate soil risk maps for severe! coastal regions of WA are accessible via Data WA Provided by
Empirical methods to calculate the radial extent of the groundwater cone of depression and pumping rates Department of Water and Environmental
and times for dewatering operations are outlined in National Acid Sulfate Soils Guidance: Guidance for the Requisition
dewatering of acid sulfate soils in shallow groundwater environments
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Calculator fving

Input

Length of excavation metres

Width of excavation metres

Drawdown required: 27 metres

Aquifer thickness'!! 10 metres

 

Hydraulic conductivity: 0.0000949 metres/second

Results
Effective pumping radius, Re 10 metres
Gone of depression radius, R,, 79 metres

Total pumping rate litres/second

Pumping time required 177 hours