Queenstown Lakes District Council (QLDC) said it is continuing to investigate control issues associated with the Alpha Series development discharging stormwater into Bullock Creek.
The response comes after Friends of Bullock Creek (FOBC) Incorporated asked QLDC to answer to its concerns about the future health of Bullock Creek, including potential flood risks to downstream properties from consented stormwater discharge from nearby subdivisions.
Throughout the last year, FOBC has pointed out stormwater and flood risks from the Alpha Series subdivision and Studholme subdivision above the creek catchment. FOBC is concerned that stormwater and sediment from the new subdivisions could enter Bullock Creek before it enters Lake Wānaka.
"We are continuing to investigate control issues associated with the Alpha Series development discharging stormwater into Bullock Creek," said a QLDC spokesperson. "A series of engineering reports prepared for council and the developer have confirmed the system is not performing as it was designed to."
Commissioned by QLDC, the design and performance review was carried out on the Alpha Series subdivision stormwater system. FOBC also noted that the recent peer review has confirmed that the storm water management and drainage system is not working as designed.
When asked for comment about the open letter and what council is doing to protect Bullock Creek, the QLDC spokesperson said, "We are having discussions with the developer to ensure stormwater is able to be handled appropriately on the site. Given the development that has occurred in the area in recent times, council is also carefully looking at overall stormwater catchment management requirements. We may need to consider additional works to deal with any issues identified."
The spokesperson added, "While a review of the Alpha Series stormwater system is being undertaken, council will work with the developer to minimise any adverse effects from any stormwater discharge from the existing consented site."