Environment

2.5 Stormwater

Wai-ua

The stormwater network keeps people and property safe from flooding

What we do

Stormwater management

Our stormwater activities contribute towards us beingTop

People-centred – A safe and reliable stormwater network and effective maintenance and operation programmes prevent avoidable disruptions to community living and minimise the risks of injury and the risks of damage to property from stormwater.

Eco-city – A safe and reliable stormwater network minimise the impacts – such as erosion – of stormwater on the environment.

Dynamic central city – A safe and reliable stormwater network and effective maintenance and operations programmes allow people to live, work and play in the central city safely and without disruption.

Connected – A safe and reliable stormwater network and effective maintenance and operations programmes reduce the risk of avoidable surface flooding and environmental damage that may affect transport networks.

As a part of the stormwater consent compliance a Stormwater Consultative Committee has met approximately every three months to discuss and provide comment on stormwater issues. The committee is made up of parties who expressed interest during the initial consenting process.

Key projectsTop

During the year:

What it costsTop

Operating Expenditure ($000) Actual
2013
Budget
2013
Variance
2013
Actual
2012
2.5.1 Stormwater Management1        
Expenditure 17,490 17,411 (79) 16,044
Revenue (3,655) (48) 3,607 (2,632)
Net Expenditure 13,835 17,363 3,528 13,412
Capital Expenditure ($000) Actual
2013
Budget
2013
Variance
2013
Actual
2012
2.5.1 Stormwater Management2        
Expenditure 2,564 2,584 21 4,001
Unspent portion of budget to be carried forward N/A 1,208   N/A
  1. Under budget due to the recognition of unbudgeted vested asset income.
  2. Under budget due to delays in the Davis Street culvert strengthening work and delays in the commencement of the Tasman Street and Oban Street stormwater renewal projects.

How we performedTop

Our stormwater activities should protect public health and property without compromising the environment. We measure our effectiveness by monitoring beach water quality, and by resident satisfaction with the stormwater network and response times for service requests.

To measure the standard of the stormwater service

Residents (%) who agree stormwater services provide good value for money

Result: 69% (target: 75%).

Source: WCC Residents’ Monitoring Survey 2013

Customer (%) satisfaction with stormwater network service

Customer (%) satisfaction with stormwater network service.

Source: Capacity Infrastructure Services Ltd

Response time to service requests (%) within one hour of notification

Result: 72% of requests were responded to within one hour of notification (target: 95%). Transition issues with the new service provider are being addressed. Despite the non-compliance no complaints were received.

Source: Capacity Infrastructure Services Ltd

Number of buildings reported to have been flooded as a result of a less than one-in-50-year rain event

Result: 49 properties flooded (target: no properties flooded).

All of the properties flooded are a result of four significant weather events. Investigations on network capacity are being undertaken to understand cause and potential solutions.

Source: Capacity Infrastructure Services Ltd

To understand the impact of stormwater on the environment

Bathing beaches (%) compliance with Ministry for the Environment guidelines (Green Status)

Bathing beaches (%) compliance with Ministry for the Environment guidelines (Green Status).

Source: Capacity Infrastructure Services Ltd

Seawater samples are collected and analysed for Enterococci bacteria, in accordance with GWRC and the Ministry for the Environment requirements. Samples collected within 48 hours of a heavy rain event can read high due to contaminants entering the stormwater network.

Stormwater resource consent compliance (includes the monitoring of overflows, stormwater outfall discharge and coastal water quality)

Stormwater resource consent compliance has been achieved.6

Source: Capacity Infrastructure Services Ltd

6This result is based on the last formal confirmation received from GWRC in October 2012. The final confirmation of compliance from GWRC will not be received until after publication of this report.