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Hillingdon SuDS Design & Evaluation Guide

Detailed

Detailed Design 71 Plan excerpt: proposed new Holyoaks Primary School, Redditch. The detail design stage confirms the layout, character and function of the SuDS, Including detailed levels, volumes, flow controls and component design. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

9.3.3 Supporting information Depending on the nature of the scheme various investigations, tests and calculations may need to be performed along with obtaining necessary consents: ■■ ■■ ■■ ■■ Ground investigation, including infiltration test results, soil testing and groundwater monitoring as appropriate. Design calculations which demonstrate compliance with the design criteria for the site including all hydraulic and structural calculations for permeable pavements and underground storage structures as appropriate. Completion of standard design information forms as may be provided by the LPA. Details of any offsite works required, together with any necessary consents in place (or can be obtained). ■■ near a main river (including where the river is in a culvert), works on or near a flood defence or for works in the flood plain of a main river; Ordinary Watercourse Consent (LLFA) for any structure with the potential to affect flows in an ordinary watercourse; highway drain (Highways Authority); or with Sewerage Undertaker for any connections to the public sewer. Discussions should be held with EA for Infiltration within Source Protection Zone areas or higher risk sites; Local Authority and Inland Drainage Board byelaws, comments and constraints. Proposed maintenance schedule and confirmed management arrangements for all non adopted drainage. Identify any proposed split of the SuDS between private (curtilage) and public (open space or highway) land. Detailed Design 72 ■■ Confirmation that discharge consents are in place (or can be obtained): Environmental Permit (Environment Agency) - an Environmental Permit may be required for works in, under, over or ■■ ■■ Designers hazard and risk assessment- to consider construction, maintenance and operation by personnel and day to day site use by public. Details of any informative signage proposed for SuDS. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

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