Teversal Place – Sutton-in-Ashfield

The Challenge

Existing optioneering proposals all included forms of onsite attenuation and flow restriction despite the outfall connecting into an existing Phase of the same development under control by the Developer.

Our Approach

Review and interrogate hydraulic model for existing phase to establish hydraulic opportunity to reduce / remove proposed onsite attenuation.
Determine suitability of Phase 1 surface water drainage as a means of conveying flows to existing basin.
Show the impact to the existing basin footprint whilst upholding and/or reducing water levels to ensure there is no increase in flood risk.
Engagement with Severn Trent Water to confirm most appropriate method of amending the existing S104 network including replacement of Flow Control manhole and combined discharge rate.

Results

- Removal of onsite attenuation, replaced with conveyance to an extension of the existing SuDS basin that served Phase 1 of the development.
- Replacement flow control manhole introduced into existing S104 within previous Phase and design provided to original consultant for completeness.
- Reduction to construction program and carbon footprint by delivering SuDS more sustainably.

Lessons Learned

Engagement with the statutory undertaker facilitated revisiting the existing phase of the development to connect the future phase without the adoption of onsite storage.