Demanda de turismo termal

Typically stormwater is described as being rainfall that runs off roofs, roads and other surfaces and then into gutters and stormwater collection systems such as pipes, culverts, open drains/swales and detention structures.

The stormwater network infrastructure is a core service of Council and stormwater management is recognised by our Significance and Engagement Policy as a significant activity of Council. The Infrastructure Strategy (refer to page 55) outlines the strategic intent of this activity.

What we do

Stormwater reticulation systems are necessary for the effective and safe removal of rainfall to appropriate open drains, streams, rivers and lakes. Cambridge, Te Awamutu, Ohaupo, Karāpiro, Pirongia and Kihikihi typically have kerb and channel systems which discharge into stormwater pipes and open channels.

The stormwater systems in the district consist of 141 kilometres of pipes, 2,652 manholes and other related structures such as open drains, streams, swales, soak systems and retention structures.

We are the primary service provider for managing stormwater in urban areas. Council maintains all of Waipa’s public rural drains (where these are defined).

Why we do it

To limit the impacts of flooding on the community, and ensure that stormwater discharging to waterways, such as rivers and streams, are free from contaminants.

The environment in which we work

A sub-regional Three Water’s Strategy has been prepared by the Future Proof partnership to provide an overarching framework for the development and maintenance of the water supply, stormwater and wastewater systems of the Waipa District, Waikato District and Hamilton City councils. This strategy has an action plan which is being implemented by the partnership councils.

Our stormwater assets vary from new to 80 years of age, with the majority of the reticulation schemes in Cambridge and Te Awamutu being constructed of reinforced concrete in the 1970s-1980s. Based on pipe age, material and some field inspections, most of the pipes in our network are in “fair condition”. A renewal programme to maintain the condition of the stormwater assets is included in this 10-Year Plan along with a programme to carry out pipe condition and assessments.

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Waikato Regional Council requires us to demonstrate that stormwater entering the waterways does not contain any contaminants and that it is not affecting the quality of the receiving environment.

Growth is tending to occur at the extremities of the reticulation networks and there is a need to provide alternative methods for stormwater disposal. It is also necessary for developments not to increase stormwater discharge therefore any increase in stormwater generated from the development needs to be retained on that site by using best practice engineering solutions.

Over recent years regulatory compliance and best practice for stormwater design has resulted in the installation of a large number of high maintenance stormwater systems. These include infiltration devices, swales, and detention ponds. The maintenance cost of these types of structures is expected to add significantly to the ongoing cost of providing this service.

Controlling the cost of services will continue to be a challenge, in particular the construction price increases, new treatment technologies and increases in costs associated with environmental compliance.

In the past, Council maintained less than 10% of rural drains at an annual cost of around $90,000. We rely on all landowners doing their bit to keep their drains clean. Sometimes this didn’t happen, and drains weren’t maintained to an adequate standard. This contributed to flooding and other issues, including neighbourhood disputes. To address this issue, Council has taken responsibility for maintaining all of Waipa’s public rural drains (where these are defined). This means inspecting and spraying them each year, with a small portion also cleaned. This will cost around $322,000 in the first year. Funding for this will come from rates.

The level of service we will deliver

This 10-Year Plan includes a significant investment to maintain recently installed or growth driven new on-site stormwater devices, such as ponds and swales, which also provide an amenity service. In addition, the 10-Year Plan includes an increase in the level of service for the 230 km of public rural drains that Council is responsible for maintaining ( as in the paragraph above). For all other activities within this group we will maintain the current level of service.

Because of the large increase in the level of service for public rural drains, and the potential need to cater for population growth, Council will carry out an assessment to determine whether a full review of the delivery of the service is required under section 17A of the Local Government Act 2002.

What community outcomes does it contribute to?

The Stormwater group of activities contribute to many of the outcomes, but has special links to:

10-Year Plan (2015-2025) V2.0 Stormwater Page 185 Table 51: Stormwater community outcomes

Goal Community outcomes

Economically

progressive  Our services are acknowledged as excellent value for money. Environmental and

cultural champions  We are recognised as environmental and cultural leaders.

The significant decisions faced by Council in achieving these outcomes are drawn together in a table in the Infrastructure Strategy (included in this 10-Year Plan) which starts on page 56.

Key projects

The following key projects are planned for 2015-25:

Table 52: Stormwater key projects

Project Description Timeframe Total cost for 10

years

($000)

Cambridge deferred residential stormwater works.

Works to develop the stormwater network within the Cambridge North residential area.

2015/16 –

2019/20,

2022/23 –

2024/25

$23,184

Renewals (Stormwater). Ongoing district-wide stormwater network renewals programme.

2015/16 –

2024/25

$2,345

Details of the costs associated with these projects and other financial information relevant to this group of activity are included in the following pages.

Potential significant negative effects

Table 53: Potential significant negative effects

Potential negative effect How we are addressing this

The collection and disposal of stormwater can adversely affect the quality of receiving waters.

Compliance with resource consent conditions should mitigate any negative effects.

There is potential for contaminants to enter streams, rivers and lakes after accidental spillages which could result in degradation of the natural environment and possible illness.

We will work with other agencies, such as Waikato Regional Council, to ensure the impacts are minimised.

Failure to adopt effective management of the stormwater infrastructure could result in surface flooding.

We carry out planned maintenance to the network with effective renewal programmes and upgrades which reflect the asset management plan.

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