HYDROMETRIC SITE SELECTION

Training for PNG PowerPort Moresby

July 2012

SITE SELECTION CRITERIA (GENERAL)• Occupational Health and Safety

• Purpose

• Vandalism

• Power requirements

• Telemetry requirements

• Permissive occupancy

• Accessibility

SITE SELECTION CRITERIA (METEOROLOGICAL)

• Minimal effects from wind

X √

SITE SELECTION CRITERIA (METEOROLOGICAL)

• Even ground

X √

SITE SELECTION CRITERIA (METEOROLOGICAL)

• 1:4 ratio of surrounding features

X

Minimum 4x

SITE SELECTION CRITERIA (METEOROLOGICAL)

• Height of rim above GL (30-100cm)

Standard Rain Gauge (Daily Read)

Tipping Bucket Rain Gauge

300mm

1000mm

Typical Meteorological Installations

‘Vandalism’- Meteorological

SITE SELECTION CRITERIA (STREAM)• Control (stable & sensitive)• Straight section (min.100m upstream & downstream)• ‘Contained’ flow (no side channels)• Subterranean flow• Stable bed and banks• Gauge pool (aquatic growth, depth, negligible approach

velocities)• Location of instrumentation• Survey marks• Downstream effects (tidal, water storages)• Low, Medium and High flow gauging sections• Water quality considerations

Typical Stream Gauging Station Installations

Typical Stream Gauging Station Installations

‘Vandalism’- Stream

‘Vandalism’- Stream

References

• World Meteorological Organisation – Guide to Hydrological Practices (WMO No.168)

• Snowy Mountains Hydro-Electric Authority – Hydrographic Course (September 1966)

• AS3778 ‘ Measurement of water flow in open channels’

Questions ?