David Leong - Appendix 1 - Environment Canterbury
David Leong - Appendix 1 - Environment Canterbury
David Leong - Appendix 1 - Environment Canterbury
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TONKIN & TAYLOR LTD<br />
<strong>Environment</strong>al and Engineering Consultants<br />
• Auckland Future Bulk Water Supply Options Study<br />
Auckland Regional Council, 1995<br />
Senior Hydrologist<br />
As part of the 1995 study of future bulk water supply options for Auckland, evaluated the water resources<br />
and dry weather flows from small streams in the greater Auckland Region for a variety of drought standards<br />
and residual flow options.<br />
• Blowing Point Dam Feasibility<br />
Mid-<strong>Canterbury</strong> Irrigation Enhancement Society<br />
Senior Hydrologist / Hydraulic Engineer<br />
Assessed, to feasibility level, the hydrology of the South Ashburton River dam option (130 million m 3<br />
storage) to augment irrigation supply from Rangitata Diversion Race. Potential hydropower from the<br />
proposed dam and augmentation of the energy output from the Highbank Power Station were also<br />
investigated.<br />
• Mangakahia River Irrigation Consents<br />
Mangakahia Irrigation Committee, 1992-1994<br />
Project Manager and Hydrologist / Hydraulic Engineer<br />
Managed a study of low flows and environmental effects for proposed large scale pasture irrigation in the<br />
Mangakahia River catchment, Northland. Presented expert evidence in the consent hearing and,<br />
subsequently, in the Planning Tribunal in support of applications to extract water. Landmark decision<br />
subsequently awarded in applicants’ favour.<br />
• Kakanui / Waiareka River Irrigation Study<br />
Senior Hydrologist<br />
Responsible for hydrological analysis and dam storage modelling for the Kakanui/Waiareka River<br />
irrigation project (Otago) to establish storage requirements and sensitivity to residual flow criteria. Onriver<br />
storage, off-river diversion storage and pumped diversion scheme options were investigated.<br />
Hydro-electric Power<br />
<br />
Patea Hydroelectric Power Scheme Re-consenting<br />
TrustPower Limited, 2005–2008<br />
Senior Hydrologist<br />
Responsible for hydrological investigations and effects assessment in support of the application to renew<br />
consents for this 65m high dam which has a 31MW power station on the Patea River in Taranaki. Review<br />
of flood hydrology, the Probable Maximum Flood (PMF) and capacity of spillways. Dambreak hazard<br />
assessment and mapping for both flood-induced failure and sunny-day failure. Review of historical<br />
operation and consent compliance, and effects of daily peaking on river flow regime.<br />
<br />
Project Aqua<br />
Meridian Energy, 2000–2004<br />
Team Leader Hydrology and Hydraulics<br />
Project Aqua is a cascade-type hydroelectric power scheme based on the Waitaki River, with an innovative<br />
low profile river intake, 64 km of canals and six power stations. The design flow is 340 m 3 /s with<br />
generation capacity of 530 MW, and an annual output of about 3200 GWh. Project responsibilities (at<br />
preliminary design phase) included:<br />
- Co-ordination of all hydrological and hydraulic design aspects<br />
- River intake, canal intake and river outfall design<br />
- Hydrology and assessment of long term flow trends<br />
- Morphological aspects at river intake and outfalls, and assessment of bed and suspended load<br />
- Preliminary assessment of hydroenergy output and peaking potential<br />
- Assessment of overall scheme hydraulics, including transient conditions, and headlosses<br />
- Interaction with various environmental consultants, particularly with regard to fish and habitat<br />
protection, and with Electrical & Mechanical consultants.<br />
4<br />
<strong>David</strong> <strong>Leong</strong>