Page 19 - Water Pollution Management - Silty Water Treatment - Preventing Discharge

Maximise area to reduce flow rate

Diameter Settlement Area Area for 50m hr
3/

Gravel 2mm 0.02m /m 3 1m 2
2

Sand 63µm 0.1m /m 3 5m 2
2

Medium 20µm 1m /m 3 50m 2
2
silt

Fine silt 10µm 5m /m 3 250m 2
2

(cement)

Clay 1µm 100m /m 3 5,000m 2
2

(Based on a particle density of 2.65t/m 3)

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