Water AMP 2010 - Gisborne District Council

136 Pages·2010·2.22 MB·English

Gisborne District Council

Water Supply
Activity Management Plan
Activity Management Plan
Gisborne District Council Table of Contents

Version Description of change Date Initial
Draft 3 Draft for Kevin Strongman 7/10/08 jjt

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Activity Management Plan
Gisborne District Council Table of Contents

2009-2019

TABLE OF CONTENTS

1. Overview ............................................................................................................ 5
1.1. Why we do it ............................................................................................ 5
1.2. What we do .............................................................................................. 5
1.3. Where we are now .................................................................................. 5
1.4. Where we want to be .............................................................................. 6
1.5. How we plan to get there ....................................................................... 6
2. What we do ........................................................................................................ 8
2.1. Activity Description ....................................................................................... 8
3. Why do we do it ............................................................................................... 10
3.1. Activity Rationale .................................................................................. 10
3.2. Strategic Environment ......................................................................... 11
4. Where we are now ........................................................................................... 16
4.1 How the activity has developed ........................................................... 16
4.2 Levels of Service .................................................................................. 17
4.3 Asset Information ................................................................................. 18
Environmental Consents ........................................................................................... 21
Gisborne City Water Supply (GCWS) ........................................................................ 23
Te Karaka Water Supply (TKWS) .............................................................................. 38
Whatatutu Water Supply (WTWS) ............................................................................ 42
4.4 Current Costs and Funding Policy ...................................................... 46
4.5 Key partners/stakeholders ................................................................... 47
4.6 Assumptions ......................................................................................... 49
4.7 Risk Management ................................................................................. 50
4.8 Negative effects .................................................................................... 51
5. Where we want to be .......................................................................................... 53
5. Where we want to be .......................................................................................... 53
5.1 Growth ................................................................................................... 53
5.2 Trends .................................................................................................... 56
6. How we plan to get there ................................................................................... 63
6.1 Options and Choices ............................................................................ 63
6.2 Implications ........................................................................................... 69
6.3 Preferred option .................................................................................... 72
7. Improvement Plan ........................................................................................... 74
Appendix A - Levels of Service ........................................................................ 79
Appendix B – Asset information ...................................................................... 82
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Activity Management Plan
Gisborne District Council Table of Contents

Asset Info – Graphs ................................................................................................. 82
Asset Condition, Capacity/Criticality, Performance and Life ................................... 84
Appendix C – Financial Information .............................................................. 113
Appendix D – Risk Management Approach .................................................. 126
Appendix E – Asset Management Approach ................................................ 131
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Activity Management Plan
Gisborne City Council Overview

1. Overview
1.1. Why we do it
To provide a constant, adequate, sustainable and high quality water supply to Gisborne’s
reticulated areas.
1.2. What we do
The Council provides reticulated water supplies for Gisborne City including parts of Manutuke and
Makaraka. Council also provides reticulated rural water supplies for Te Karaka and Whatatutu.
For these areas, Council owns and maintains the whole water supply network which covers:
Collection of raw water.
Treatment of raw water to produce suitable quality and quantities of drinking water.
Distribution of treated water to the point of supply to the customer, where it consistently meets
specific flow, pressure and quality standards. This includes water required for the city‟s
emergency fire fighting services.
Community outcomes
This activity contributes to the following community outcomes:

Connected Tairāwhiti Healthy Tairāwhiti

1.3. Where we are now
The Council maintains and/or owns the Gisborne water supply from its source supply, via water
treatment infrastructure to the water reticulation network, including the connections from the street
mains to all serviced property boundaries. At commercial metered connections, Council owns the
water meter and backflow preventer and charges for actual water used.
The water quality grading of Gisborne‟s reticulated water supply is currently being reviewed by the
Ministry of Health in accordance with the NZ Drinking Water Standards 2005. The last water quality
grading held by the Gisborne City water supply was an Aa grading.
The current water supply for Gisborne City is provided through seven distinct water sources. These
are:
 Mangapoike Dam Catchment (Clapcott dam and Williams dam).
 Te Arai River.
 Waipaoa River.
 Emergency bores - Cameron Road (2 bores) and Hansen Road.
Rural water supply sources include:
 Waipaoa River bore - Te Karaka supply.
 Mangatu River bore - Whatatutu supply.
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Activity Management Plan
Gisborne District Council

Council‟s two treatment plants, Waingake Water Treatment Plant and Waipaoa Augmentation Water
Treatment Plant are modern and designed to meet requirements of the NZ Drinking Water
Standards.
Te Karaka and Whatatutu are serviced with supplementary supplies. These services are provided to
“top up” tanks during periods of insufficient rainfall. Water usage is restricted to approximately
1000 litres per household per day and is controlled using a ball cock system.
The Gisborne City system provides water to communities adjacent to the Waingake bulk water main,
which includes the communities of Manutuke and Papatu Road. Parts of the Poverty Bay flats
adjacent to the Waipaoa bulk water main are also supplied.
1.4. Where we want to be
Gisborne District Council is committed to retaining an Aa water quality grading for the Gisborne
City water supply and to be in full compliance with the New Zealand Drinking Water Standards
(DWSNZ) and the Fire Fighting Code of Practice.
The Council is also committed to improving the water quality gradings for Te Karaka and
Whatatutu (subject to Government funding under Capital Assistance Programme [CAP]).
Have properly maintained the integrity of the reticulated water supply assets (DWS 2005).
Adequately extend the reticulated water supply to new subdivisions within Gisborne City and to
Gisborne‟s rural communities as appropriate.
Ensure adequate security of supply for Gisborne‟s water network.
1.5. How we plan to get there
 Undertake DWSNZ compliance projects including Hospital Hill Reservoir chlorine circulation
improvements, the installation of UV treatment at the water treatment plants and the Te Karaka
and Whatatutu rural water supply upgrades, which are solely dependent on Government
funding under Capital Assistance Programme (CAP).
 Undertake key strategic asset management and maintenance projects to maintain the integrity
of the reticulated water supply assets. Key projects include:
 Water Asset Componentry Condition Assessment and Renewals Programme.
 Clapcott Dam Supply main replacement.
 Te Arai pipe bridge repairs
 Hospital Hill reservoir sealing
 Knob Hill reservoir sealing
 Hospital Hill reservoir waveband
 Undertake a capital works to bring areas identified as not meeting the Fire Fighting Code of
Practice into compliance. Projects include:
 Selected upgrades of water mains.
 Construction of a new ring water main between Makaraka and the Awapuni Road water
main.
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Activity Management Plan
Gisborne District Council

 Implement a demand management strategy that will improve security of supply for the water
network. The strategy will focus on water conservation programmes and public education, leak
detection programmes and may result in capital expenditure projects, such as the increase of
the Williams Dam storage capacity or potentially the installation of universal water metering for
domestic consumers.
 Continue to undertake a comprehensive programme of maintenance and renewals. This will
minimise the need for emergency repairs that impose a greater cost and inconvenience to the
community.
INCLUDES TEXT INSERTED FROM THE TEN YEAR PLAN ON 19 FEBRUARY 2009

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Activity Management Plan
Gisborne District Council

2. What we do

2.1. Activity Description

Overview of the Public Water Supply System

Factor Gisborne City Te Karaka Whatatutu Total
Population Served 41,922 543 280 42,745
Length of Reticulation (kms) 240.58 4.1 2.7 247.38
Pump Stations (no.) 8 1 1 10
Fire Hydrants (no.) 1508 0 0 1508
Replacement Value ($000) 143,007 275 151 143,433
Depreciated Replacement Value ($000) 89,080 116 33 89,229
No. of Connections 12,972 162 42 13,176
How Water Sourced Dams, Rivers Bores Bores
Annual Total Volume of Water Produced (m³) 5.79M 36,500 11,960
Average Daily Volume of Water produced (m³) (2006/07) 15,540 142 33
Annual Total Volume of Water Sold (m³) (2006/07) 1.95M 0 0
Water Supply Grading U U U
Average Consumption per Connection (m³/year) 300 221 204

The following area communities are reticulated by Council administered supplies:
• Gisborne City, including parts of Manutuke and Makaraka
• Te Karaka
• Whatatutu

The following area communities are reticulated by non-Council administered supplies:
• Te Puia Springs

The following areas are non-reticulated, private supply systems sourced from roof catchments,
ground water bores/springs or surface water.
• Matawai
• Muriwai
• Wainui / Okitu
• Makorori
• Tolaga Bay
• Tokomaru Bay
• Ruatoria
• Tikitiki
• Te Araroa
• Patutahi
• Tiniroto
• Ormond
• Hicks Bay
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Activity Management Plan
Gisborne District Council

The Gisborne City Water Supply

The Council maintains and/or owns the Gisborne water supply from its source supply, via water
treatment infrastructure to the water reticulation network, including the connections from the street
mains to all serviced property boundaries. At commercial metered connections Council owns the
water meter and backflow preventer and charges for actual water used.

The Gisborne City system provides water to communities adjacent to the Waingake bulk water main,
which includes the communities of Manutuke and Papatu Road. Parts of the Poverty Bay flats
adjacent to the Waipaoa bulk water main are also supplied

The design capacity for the system is 30,000m³ per day. Demand on any given day may exceed this
and theoretically the system could be run to 43,000m³ per day (30,000m³ Waingake and 13,000m³
Waipaoa).

The water quality grading of Gisborne‟s potable water supply is currently being reviewed by the
Ministry of Health in accordance with the NZ Drinking Water Standards. The last water quality
grading held by the Gisborne City water supply was an Aa grading.
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Activity Management Plan
Gisborne District Council

3. Why do we do it

3.1. Activity Rationale

The goal of providing a public water system is to ensure the health of the community thereby
eliminating the need for individuals to provide their own water system with much higher health risks.
In providing a public water system the objective is to effectively provide a quality, efficient and
environmentally acceptable system in a controlled and regulated manner. To provide those services
for the present needs with an overview of not constraining future generations to ensure sustainable
growth for desired levels of service.

Other significant corporate goals are to:

 Comply with all legislation.
 Comply with audit requirements.
 Complete programmes as detailed in the Strategic Plan, Annual Plan, Estimates and Activity
Management Plans.

The Council‟s principal objectives are:
The water network assets contribute to the practical delivery of the Council vision and mission as
follows:

Preservation Provide a water supply to protect public health.
Provides a modern and convenient to use
reticulation system, recognising the finite nature
of the water resource.
Enhance Protects the physical environment through the
Environment treatment and discharge of effluent through
approved methods with appropriate consents.
Sustainable Through ensuring water is transported in a
Management sanitary manner to its point of use in an integral
and secure system.
Economic Base Facilitate the continuing development of both
private and business interests by providing the
underlying water infrastructure required to
support the economic base of the community.
Future Maintain the asset base in perpetuity by
Generations providing a water system on a commercial basis
to achieve efficiency, sustainability and
customer focus.

The Council has several roles with respect to water supply services:

 to co-ordinate the setting of community outcomes to which the water supply of the Council
might apply

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