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Working for wetlands
THINKING
THINKING
SANBI Working for Wetlands
•	Nationwide programme to rehabilitate wetlands
•	Started in Working for Water as alie...
THINKING
Project overview
•	Client is South African National Biodiversity
Institute (SANBI)
•	Professional fees: A$2.4 mil...
THINKING
THINKING
Typical problems in wetlands
•	Headcut erosion
•	Artificial drains
•	Incised channels
•	Excessive sediment
•	Man-...
THINKING
Why rehabilitate wetlands?
•	Restore its natural functioning
•	Re-hydrate by lifting the water table
•	Increase w...
THINKING
Aurecon’s role
•	Consulting and planning services.
•	Engineering design of ±400 structures per year.
•	Coordinate...
THINKING
Design principles
•	Visual determination of annual flood levels
•	Hydraulic design for drowned structures using
s...
THINKING
Tsitsikama
THINKING
Risk
•	High risk but low cost of failure (no damage
incurred by failures)
•	Project geared towards repairing fail...
THINKING
THINKING
Before and after
THINKING
Before
THINKING
After
Contact
André Görgens
Water Resources Management Leader, Aurecon
+27 21 526 5704
Andre.Gorgens@aurecongroup.com
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Working for wetlands

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Working for wetlands

  1. 1. Working for wetlands THINKING
  2. 2. THINKING SANBI Working for Wetlands • Nationwide programme to rehabilitate wetlands • Started in Working for Water as alien clearing • Annual budget of A$ 9.7 million • Uses SMME principles • Restore +100 wetlands/year • Creates +2100 jobs/year
  3. 3. THINKING Project overview • Client is South African National Biodiversity Institute (SANBI) • Professional fees: A$2.4 million • 3 year appointment • Aurecon involved countrywide (several offices throughout South Africa) • Wetland ecologists sub-consult to Aurecon
  4. 4. THINKING
  5. 5. THINKING Typical problems in wetlands • Headcut erosion • Artificial drains • Incised channels • Excessive sediment • Man-made diversions • Alien invasion
  6. 6. THINKING Why rehabilitate wetlands? • Restore its natural functioning • Re-hydrate by lifting the water table • Increase water storage • Improve water quality • Increase biodiversity • Aesthetics & tourism
  7. 7. THINKING Aurecon’s role • Consulting and planning services. • Engineering design of ±400 structures per year. • Coordinated large team consisting of - Environmental practitioners - Engineers - Wetland Ecologists - SANBI Provincial Coordinators • Comply with legislation and obtain environmental and water use authorisations
  8. 8. THINKING Design principles • Visual determination of annual flood levels • Hydraulic design for drowned structures using simple weir calculations • Standardised structural designs • Component-based concrete weirs - Book of standard details for each component of a weir - Each detail is for a different size of component
  9. 9. THINKING Tsitsikama
  10. 10. THINKING Risk • High risk but low cost of failure (no damage incurred by failures) • Project geared towards repairing failed structures • Inexperienced contractors
  11. 11. THINKING
  12. 12. THINKING Before and after
  13. 13. THINKING Before
  14. 14. THINKING After
  15. 15. Contact André Görgens Water Resources Management Leader, Aurecon +27 21 526 5704 Andre.Gorgens@aurecongroup.com

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