Hikurangi Swamp Working Group Meeting 19/8/14 Topic/Owner Information 1 Last Meeting and Apologies Minutes 2 Terms of Reference & Code of Conduct Representative positions still not filled 3 Operations/Maintenance 1. Monthly Overview from Hydrotech 2. Pump Availability 3. Pump Rewind 4. Power Usage 5. Pump Operation 6. Te Mata Pump Blockage & Winch Ropes – Station Access 7. Stopbank Re-instatements 8. Spillways 4 Finances Hydrotech Report Review 5 14-15 Drain Clearing Drain Clearing Proposal 6 Buildings Maintenance Building Condition 7 Consent Change Gravity Gates 8 Environmental Issues Okarika Ox-Bow re-establishment 9 Bermland Fencing & usable area 10 2014/15 Capex Stopbank Adjustments 11 Asset Management Plans Engagement of Contractor 12 Long Term Considerations Hikurangi Plains Water 13 Communications Distribution Lists 14 Resources Resources 15 AOB * Discussion and decision points
Terms of Reference
Operations and Maintenance – Overview of HydroTech’s July Report • Storm readiness procedure was implemented on 10 th /11 th July • Overtopping occurred on both spillways and stopbanks onto all pockets • Damage to the Northpower electricity network resulted in pumping station being without power for 2 – 3 days • All pumping station were operate over the course of the month to remove impounded water, flood gates utilised where possible • Pasture loss was incurred in all pockets • Water was cleared from all pockets by end of July
Operations/Maintenance - Pump Availability ~1.1 m 3 /s Pumps ~ 4.1 m 3 /s Pumps Station Station Capacity A B C D E (m 3 /s) Otonga Flygt (17%) Flygt (17%) Pleuger (65%) 6.3 Te Mata Pleuger (17%) Flygt (17%) KSB (65%) 6.3 Mountain Pleuger (50%) KSB (50%) 2.2 Tanekaha McKewen Pleuger (50%) 2.2 (50%) Junction Pleuger 1.1 (100%) Ngararatunua Pleuger (11%) Pleuger (11%) Pleuger (39%) Pleuger (39%) 10.4 Okarika Pleuger (10%) Pleuger (10%) Pleuger (10%) Pleuger (35%) Pleuger (35%) 11.5
Operations/Maintenance - Pump Re-wind Update • Goal is to have all stations operational and hold 1 spare small and one spare 240HP Pleuger. • 2 Small Pleuger rewinds – both pumps have been wired ready for connection testing on Monday 25 th August, delivery that week. The 3 rd is with SAAW – wire on order. • Spare 240 HP Pleuger repair – this is completed, stored safely at SAAW’s depot. Claim still with insurer. • Spare 240 HP Pleuger Prop – Sourcing of a replacement prop is being undertaken, likely have to cast a new one from one of originals on a pump.
Operations/Maintenance - Power Usage July Update not yet available
HydroTech July Report Review – Pump Hours Run Pocket Pump Junction Te Mata Tanekaha Mountain Otonga Ngararatunua Okarika A 393 451 414 483 494 488 522 396 225 546 454 0 465 B C 0 D 326 464 388 402 E 372 379 All pumps were available at month end, apart from pump C at Okarika and pump B at Ngararatunua. Note reduced pump hours; Pump D on Te Mata, Pump E at Okarika
Te Mata Pump Blockage
Te Mata Pump Blockage
Te Mata Pump Blockage
Broken Winch Rope
Broken Winch Rope
Access to stations? • Change in H&S legislation • Demonstrate competency / training for all those who operate council assets • Options; 1. Lock-down - HydroTech personnel only 2. Partial lock-down – Harder to access stations 3. No lock-down – Train all
Stopbank Cuts during July Storm Junction Cut Upper Te Mata Cut Lower Te Mata Cut
Junction Stopbank Reinstatement
Junction Stopbank Reinstatement
Junction Stopbank Scouring
Te Mata Stopbank Re-instatement (lower)
Te Mata Stopbank Re-instatement (upper)
Stopbank Re-instatement – Soil Compaction Test
Te Mata Cut Re-instatement (Lower)
Te Mata Cut Re-instatement (Upper)
Spillways maintenance • Provisional price of $1000 every 6 weeks • Discussion?
HydroTech July Report Review - Finances Flood Inspection Maintenance Environmental Attendance Drain Clearing $2,638.22 $7,627.76 - $5,637.73 - Maintenance – Replaced contactor on Pump E at Okarika, Tire blockage on Pump D at Te Mata, Securing Intake Screen, Junction Pocket Stopbank Re-instatement Flood Attendance – 32 separate invoice lines detailing the individual visits
14-15 Drain Clearing Proposal • Are all the requests for drain maintenance in? e-mail; adam.twose@wdc.govt.nz Post; Whangarei District Council, Private Bag 9023, Whangarei 0148
Building’s Maintenance
Building’s Maintenance
Upgrades to Stations? • Change in H&S legislation • Preventative maintenance is generally accepted to be more efficient than reactive maintenance • Options; 1. Complete upgrade 1 or 2 stations a year 2. Focus on worst issues on each station (e.g. bird proofing, guttering, condensation)
Consents for Gravity Discharge • Existing consent allows for the new gravity discharge gates to be considered.
Consents for Gravity Discharge • Gravity gates are estimated to cost in order of $100k each depending on location and size – assuming box culvert design with steel flap gate. Likely more for controllable sluice gate. • Indications from NRC are that permitting cuts to banks under consent may be difficult. • Currently preparing Long Term Plan – how much does the scheme wish to put into this? • Where? – Junction, Te Mata, Otonga, Tanekaha, Ngararatanua. Modified drainage discharge in Okarika. What about Mountain?
Okarika Ox-bow Restoration
Bermland • Council has become aware that not all the land that is leased is usable, e.g. ox- bows, wide river channels, particularly now fencing is going in. • Have undertaken surveys on couple of areas to establish useable areas with aim to base license fee on usable land • Options; 1. Arrange for surveying of all the bermlands 2. Survey on a ‘as request’ basis
2014/15 Capex - Stopbank Adjustments • Budget in annual plan - $357k • Contractor has indicated it isn’t able to hold 2012 price. Have meeting on site this week with WDC project manager to reassess. • He is still keen to do the work. • Aim is to award ASAP so it can be scheduled this earth works season.
Asset Management Plans (AMPs) • Preparing AMPs is a statutory obligation • Hawthorn Geddes (Conal) have been engaged to prepare - $5k to prepare draft.
Asset Management Plans (AMPs) Project Name year 2015 / 16 2016 2017 2020 2022 2023 2024 2025 2026 2027 Pump Upgrades 200,000 1,000,000 1,500,000 Gravity Drainage Gates 200,000 300,000 400,000 Stop/Control Bank Renewals 200,000 200,000 Level Sensor Renewals 100,000 Pumpstation Renewals (not pumps) 100,000 100,000 100,000 100,000 Project Name 2027 2028 2029 2030 2032 2035 2038 2040 2041 2044 Pump Upgrades 0 300,000 Gravity Drainage Gates 200,000 200,000 200,000 Stop/Control Bank Renewals Level Sensor Renewals 100,000 100,000 Pumpstation Renewals (not pumps) 100,000 100,000 100,000 100,000 100,000 100,000
Hikurangi Plains Water Had two list of suggestions for the scheme, any more?
Distribution List • E-mail updates were sent out in last flood event to pocket reps and others who we had contact details for • Do we want to populate a contact list for all those on the scheme, (e.g. advising of possible spill events)? (Can also extend to drop-box)
Resources • WDC staff resources stretched during major events incidents when scheme beneficiaries are seeking greater input from staff. • In non event situations the time spent on scheme issues by WDC staff has increased. This has included level and detail of information being requested, involvement in wider scheme issues (including consenting, fisheries, land management), requests for meetings, correspondence and site visits, etc. • To continue to provide this level of involvement additional resource are needed. This would come at cost to scheme. • Proposal to group – Employ dedicated Hikurangi Scheme staff (full or part time)?
AOB
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