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Project: Tranby Park, Hessle
Type: Residential Development


Weetwood was instructed to undertake a Flood Risk Assessment (FRA), and surface and foul water drainage strategies in support of a 600 home residential development on a greenfield site to the west of Hessle near Kingston on Hull.

The site is located in Flood Zone although a recent history of flooding in the vicinity of the site had meant that the impact of the development on local flood risk was a sensitive issue.

What We Did

Weetwood developed a Flood Risk Assessment to acompany the planning application. The FRA report incorporated a surface water drainage strategy and a foul water strategy.

There were no watercourses on or in the near vicininty to the site. Weetwood therefore commissioned a series of percolation tests to BRE365 standards to investigate the potential for disposing of surface water by infiltration. The final strategy incorporated infiltration basin of sufficient depth to reach the chalk underlying the site.

Weetwood also calculated foul water discharge rates from the proposed developed and using these, negotiated a connection point onto the nearby public sewer network with the water undertaker. The agreed connection point was some 1,200m nearer to the development than previously agreed by the housebuilder, thereby saving the housebuilder an estimated £125k in engineering works.

Weetwood also attended a public consultation event in Hessle and discussed the flood risk and drainage aspects of the proposals with local councillors and members of the public.

Outcome and Value Delivered

The flood risk assessment demonstrated that the site could be developed safely and a sustainable drainage (SUDS) solution was developed which by mimicking existing surface water drainage on the site did not increase flood risk elsewhere.

The foul water strategy developed by Weetwood, and subsequent negotiations with the water undertaker saved the housebuilder an estimated £125k.