Dewatering Management Plan · OPW24/0032

San sovermment of Western Australia

l eoartrnent of Water and Environmental Regulation
me ease mi

Your environment | Acid sulfate soils | Cone of depression

Cone of depression

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DER requires 2 preliminary assessment of the radial extent of the cone of depression and pte eN rice

Pumping rates and times for all dewatering operations in ASS erees.

Empirical methods to calculate the radial extent of the groundwater cone of depression and
pumping rates and times for dewatering operations are outlined in Appendix E of @

 

Treatment and management of

ind water in acid sulfate soil landsc

Air quality

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Contaminated sites

 

 

(Published July 2011, Revised June 2015)

Calculator

Input

Length of excavation 23
(metres):

Width of excavation 20
(metres):

Required groundwater | 295
drawdown (metres):
Saturated thickness of

the unconfined re
aquifer'*) (metres):
Hydraulic conductivity
of the aquifer (K)
(metres per second):

0.0000949

Calculate

Results

Effective radius of
pumping well , R.
(metres):

Radius of influence of
dewatering, R,
(metres):

(i.e. radius of the cone
of depression)

Total pumping rate
(litres per second):
Time taken to establish
the cone of depression
(hours):

 

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