Rivers Group. Effect of Canterbury Earthquakes on Waimakariri, Kaiapoi, & Halswell Rivers. Flooding & Drainage Perspectives
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1 Rivers Group Effect of Canterbury Earthquakes on Waimakariri, Kaiapoi, & Halswell Rivers Flooding & Drainage Perspectives
2 Waimakariri River Catchment
3 Waimakariri River Hydrology Catchment area - 3,990 km 2 Minimum flow - 25 cumecs Mean flow cumecs 450 year return period flow - 4,700 cumecs Largest recorded flood - December ,990 cumecs Most recent flood - December ,500 cumecs
4 Waimakariri River
5 Waimakariri River - Flood Hazard
6 Waimakariri River Waimakariri - Eyre - Cust Flood Protection System Primary Objective To maintain the Waimakariri River system downstream of the lower gorge so that it has the capacity to convey the design flow (4,730 cumecs) to the sea.
7 Waimakariri River
8 Waimakariri River WEC Flood Protection System Includes the Eyre, Cust, Cam, & Kaiapoi Rivers $130m flood protection asset value Includes114 km total stopbank length Annual maintenance programme $3.0m Potential flood damages - up to $8 billion Design flood flow 4,730 cumecs
9 Waimakariri & Kaiapoi Rivers September EQ Damage Extent Stopbanks downstream of Northern Motorway on Kaiapoi Stopbanks downstream of Dickeys Road (lower Coutts Island) on Waimakariri Overall 22 km length of which about 40% had structural damage Even where no visible damage up to 300 mm of crest settlement
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12 EQ Damage - Waimakariri & Kaiapoi Rivers
13 EQ Damage - Waimakariri & Kaiapoi Rivers
14 EQ Damage - Waimakariri & Kaiapoi Rivers
15 EQ Damage - Waimakariri & Kaiapoi Rivers
16 EQ Damage - Waimakariri River
17 EQ Damage - Waimakariri River
18 EQ Damage - Waimakariri & Kaiapoi Rivers
19 Kaiapoi Courteney Floodgates
20 EQ Damage - Waimakariri & Kaiapoi Rivers Response - First Week Scope damage Assess flood capacity loss Develop repair options, programme, & cost estimate Communication Organise construction teams - supervisors & machinery Engage geotechnical engineer Secure funding Determine RMA requirements Start Repairs
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22 EQ Damage - Waimakariri & Kaiapoi Rivers Response - Ongoing Target following September EQ - restore 60% of design flood capacity by Xmas 2010 Up to 8 construction teams working at once Excellent response from ECan Depot staff & contractors Long hours & increased responsibility Share information with overseas experts & NZ River Engineers
23 EQ Damage - Waimakariri & Kaiapoi Rivers Response - Ongoing Engage Project Engineer on contract Monitor progress & costs Ensure engineering input practical & flexible Geotechnical assessment report(s) prepared Level control benchmarks checked Stopbank levels surveyed High & medium priority work completed by Xmas i.e. 3,000 cumec target flood capacity achieved - cost $3m Dec 28 th Flood of 2,500 cumecs successfully contained
24 EQ Damage - Waimakariri & Kaiapoi Rivers February EQ - Response Less damage in similar locations Re-build needed at medium & high priority sites Close to full design capacity achieved by May additional cost $2m Minor/low priority repairs to be completed by Xmas 2011 Ongoing monitoring & repair essential - no guarantees until system tested? Another large flood in December??
25 EQ Damage - Waimakariri & Kaiapoi Rivers Key Lessons Retention of core specialist staff & contractors is vital EQ risk assessment & accurate asset valuation very important Funding provision for repairs - reserves &/or insurance - essential Design stopbanks & culverts to be EQ resistant? Liquefaction has correlation with flood piping threat to stopbanks
26 Halswell River
27 Halswell River Rating District Catchment area 180 km 2 Halswell River Drainage network - 40 km river channel & 114 km drains Maintenance Objectives - To provide efficient and economic drainage - To control lateral and bed erosion of drains - To maintain the cross section shape and grade of the drains Nominal channel capacity about 30 cumecs Annual maintenance programme about $500,000 Current Maintenance regime - aquatic weed cutting - machine cleaning as required
28 Halswell River
29 Halswell River Recovery Process Walkover condition assessment Priority to restore base flow drainage capacity 26 km river length & 3 km drains cleaned LiDaR and cross section data collected
30 Halswell River Recovery Process Hydraulic modelling & slope stability assessments Need for further work being assessed 3 year goal to restore flood capacity & slope stability $600,000 expenditure to date - up to $2.5m additional restoration cost
31 Halswell River Issues / Lessons Access for maintenance a problem Flood capacity / drainage service standards not well defined Inadequate cross section / channel condition monitoring No pre-eq system hydraulic model & limited understanding of system No pre-eq recognition of damage risk & inadequate reserves Historically run on oily-rag principal
32 Flora/Fauna Condition pre-earthquake: Lower Waimakariri & Kaiapoi tidal flats important breeding grounds for fish and birds Halswell important eel habitat Habitat for Inanga/whitebait Halswell maintenance regime - weed clearance & machine cleaning Potentially effected by: Liquefaction smothering of instream habitat Bank slumping and cracking Channel restoration work Suspended sediment Sewerage discharge directly into waterways
33 Flora/Fauna Rivers now suitable for recreational use - contact should be avoided after heavy rainfall (potential for contaminated runoff) Opportunity for integration of riparian stock exclusion & planting into Halswell works programme Published reports on the ecological effects on Christchurch Waterways are available at:
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