Thames Valley/Matatoki
Water Supplies
October 2012
Summary
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Supplies
Challenges
Options
Community Working Group
Next Steps
Maps
Supplies
• Matatoki, Puriri, Omahu and Hikutaia are
small rural communities located to the
south east of Thames.
• The water supplied to these communities
comes from local streams in the area with
minimal treatment.
Matatoki
• The water supplied is from the Matatoki
Stream with the intake located adjacent to
the Quarry.
• The water is treated with chlorine only and
it is recommended consumers install
onsite systems to treat the water.
• This supply does not currently meet
Drinking Water Standards (DWS).
Thames Valley
• The Thames Valley scheme includes the communities of
Puriri, Omahu and Hikutaia and parts of the surrounding
rural areas.
• Puriri, the village and the rural community, is supplied
from a Hauraki District Council owned take on the
Apakura (which is a tributary to the Puriri Stream).
• Omahu, Hikutaia and the surrounding rural communities
are supplied from an intake on the Omahu Stream.
• These supplies are not treated and it is recommended
consumers install onsite systems to treat the water.
Challenges
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Resource Consenting
Reticulation
Water Demand
Drinking Water Standards
Resource Consents
• Obtaining resource consents for water supplies
on the Coromandel Peninsula is often difficult
due to the small capacity of most Coromandel
streams.
• Challenges have been faced over a number of
years, in Matatoki in particular, due to the low
flows in the streams during the summer period.
• Waikato Regional Council (WRC) have
confirmed that the Matatoki Stream is not a
sustainable take for TCDC in the long term.
Reticulation
• The reticulation network is over 60 years
old and was originally installed by the
farming community.
• Parts of the reticulation have come to the
end of their useful life and large scale
replacements are required.
• Regardless of the future option selected,
renewals will be required.
Water Demand
• The following demand has been established for
each township
Design Demand
Catchment
Design Demand
During Peak Summer Period (m3/d)
Matatoki
1,150
Omahu and Hikutaia
1,860
Puriri
800
Drinking Water Standards and
the Ministry of Health
• Rural/Agricultural standards
• As part of the Ten Year Plan, decision was
made not to pursue treatment due to
uncertainties & affordability
• Latest indications from Central Government –
Drinking Water Standards to be applied where
practicable.
Options
A number of options have been investigated for
source water over previous years, including:
• Groundwater
• Thames Water Treatment Plant
• Kerepehi Water Treatment Plant
• New supply on the Hikutaia River
• New supply on the Puriri River
• Bankside storage (on small streams)
• Self sufficiency for water
• Maintaining existing operation
Developed Options
Prior to the Ten Year Plan (TYP), the
following four options were investigated in
more detail:
• Supply all water from the Puriri River
• Self sufficiency and hand back of the
supply
• Combination of groundwater and surface
water
• Optimise & retain existing operation
Supply from Puriri
This option includes the following:
• New consent & intake on the Puriri River
• New pumpstation
• Renew and upgrade reticulation
• Install reservoirs
• Minor treatment (solids & colour only)
• State Highway connection (Matatoki – Puriri)
• $12.6M over 10 years
Discontinue – Hand Back
This option includes the following:
• Process to stop supplying water to residents (in a
supply larger that 200 people)
• Submit plan to Ministry of Health (MoH)
• Installation of rain tank system to all dwellings
• Interconnection of Matatoki and Thames Valley
supplies
• Handing back rural supply for farmers to operate
• Inform farmers of the required CAPEX and OPEX
for the supplies
Discontinue - Costs
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Tanks - $1,950,000 (450 properties)
Reticulation connection - $417,000 (1.8km)
CAPEX (farmers) - $4.5m (retic and consents)
OPEX (farmers) - $250,000/year (O&M)
Hills vs. River Option
• Relying on supplying the Waihou River side of the
highway from groundwater
• Supplying the hills side of the highway with the
existing takes (Matatoki and Omahu)
• All of Puriri would remain supplied from the Apakura
• Renewing required pipework infrastructure
• $7M over 10 years
Due to the unsuitability of groundwater supply, & the
capital cost, this option was abandoned & no further
investigations were undertaken.
Optimise & Retain Existing
Operation
• Retain the existing intakes
• Interconnection of Matatoki and Thames Valley supplies
• Renewal of the existing pipelines. Upgrades done where
necessary (undertaken as a 25 year programme)
• Reduce intake volumes over time as losses are reduced
• Install Chlorine dosing at each intake
• Upgrades to the intake infrastructure (screens etc.)
• Input from Council/senior management in consultation with
WRC
• $5.3M over 10 years
• If the required consent volumes could not be achieved, a link
from the Thames network could be installed for an extra
~$1.8M
Supply from Kerepehi Water
Treatment Plant
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This option was investigated previously
Now being investigated in further detail
Drinking Water quality supply
Volumes, details & costs currently being
looked into further
2012-22 Ten Year Plan
• As part of the TYP (Ten Year Plan) process,
funds were allocated for the project based on
the ‘Maintain Existing Operation’ option ($5.3M
over 10 years including renewals).
• This is not set in stone and can be amended to
reflect the selected long term option as this
project develops over the coming months.
Community Working Group
• Council wish to form a Community Working Group.
• The group will work with Council staff on options,
providing sound local knowledge and practical ideas.
• This group would be a total of 5-7 key practical locals
to represent the entire Thames Valley area.
• This group will meet regularly to discuss long term
options and work though ideas.
• If you are interested or would like to nominate
someone to act as a representative, please put there
name, address, contact details and occupation in the
box at the back of the room.
• Elected Members and staff will work with the
nominations to form the group.
Next Steps…
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Formation of Community Working Group
Review existing and/or new options
Recommend option – early 2013
Implementation to follow
Maps - Matatoki
Maps - Puriri
Maps - Omahu