Styx Mill Road - stormwater facility construction


Works to construct a first flush basin and wetland.


To provide a sedimentation basin for first flush treatment and a stormwater wetland for secondary treatment and partial attenuation within the catchment.


315 Styx Mill Road, Casebrook.


20 March 2023 to December 2023. Monday to Friday, 7am to 5pm (weather/site condition dependent).


The contractor is GSL. Phone Darcy Arnold 021 326 089. Christchurch City Council Contact is Olga Naumova, Phone 027 581 3894.


  • The proposal involves the construction of a stormwater management facility comprising a first flush dry basin (FFB) and wetland for the polishing treatment and attenuation of stormwater derived from existing and future urban development within the catchment.
  • The system will divert stormwater from Donalds Drain into the stormwater basins via a diversion weir in the drain and a new culvert under Gardiners Road.
  • Some property access may be affected. Traffic management will be in place on along Gardiners Road.
  • Safety is our number one priority. Stay clear and stay alert. Please keep children and pets a safe distance from the worksite and construction machinery.