Hikurangi Swamp Working Group Meeting 19/8/14 Topic/Owner Information - - PowerPoint PPT Presentation

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

10th/11th 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

Station

~1.1 m3/s Pumps ~ 4.1 m3/s Pumps

Station Capacity (m3/s) A B C D E 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 (50%) Pleuger (50%) 2.2 Junction Pleuger (100%) 1.1 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 25th August, delivery that

• week. The 3rd 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

• riginals on a pump.

Operations/Maintenance - Power Usage

July Update not yet available

HydroTech July Report Review – Pump Hours Run

Pump Pocket

Junction Te Mata Tanekaha Mountain Otonga Ngararatunua Okarika

A 393 451 414 483 494 488 522 B 396 225 546 454 465 C 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

Upper Te Mata Cut Lower Te Mata Cut Junction 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

Inspection Maintenance Environmental Flood 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
• bligation
• 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

2027 2028 2029 2030 2032 2035 2038 2040 2041 2044

300,000 200,000 200,000 200,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 Project Name Pump Upgrades Gravity Drainage Gates Stop/Control Bank Renewals Level Sensor Renewals Pumpstation Renewals (not pumps)

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