7/23/2019 Stilling Pond Dewatering Diagram

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Stilling Pond (De-watering) STP-01Apr-10Drawn: Date:

GMW

300 mm (min)

300 mm (min)

1.5 (min)

1

Overflow siphon

Top water levelH

(e) Siphon overflow system

2(min)

1

W

Earth

embankment

Rock filter dam keyed 200mm (min) into ear th embankment

Key rock into bank tocontrol seepage atinterface between earthbank and rock filter dam

Top water level

H

(d) Typical profile of rock-lined overflow spillway

Pond

300 mm (min)

2 (min) 1.5 (min)1 1Earth embankment

100 mm (min)

300 mm

(min)1

1

Cut-off trench required for embankments

greater than 1 m in height

Maximum water level

(c) Typical cross-section of earth embankment

(b) Typical cross-section of rock-lined overflow spillway

PondFall

1

3 (min)2 (min)

1

2x Fall (min)

Overflow spillway

1000 mm (min)

Scour protection (if required)

Earth embankmentOverflow spillway

(a) Stilling pond with overflow spillway

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