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Hillingdon SuDS Design & Evaluation Guide

Detailed

Detailed Design 73 9.3.4 Detailed Design Evaluation Checklist The following table provides a list of key considerations for design and evaluation. The CIRIA SuDS Manual Table B.3 provides other aspects for checking which may be incorporated on a case by case basis. Deliverable Key design points Key evaluation points Responsibility to check Design standards Designers should confirm how all standards have been achieved for quantity, quality, amenity and biodiversity. Confirm Where positive discharge is method & made to a watercourse / sewer, locations of consider likelihood of surcharge discharge on storage from the receiving sewer / watercourse. Infiltration – outline how ground will be protected from compaction during construction. Hydraulic Detailed checklist is contained calculations Section 9.5.10. Detailed Levels are crucial – check that consideration there are no locations where low of site and points might compromise design. drainage Designer to present drawing design levels showing detailed levels across the site Drainage Minimise risk of blockage by details designing protected outlets and flow controls Confirm allowable attenuation LPA rates. Confirm amenity and biodiversity requirements. Review the level at which water LLFA is stored relative to receiving flood plain levels/sewer invert. Infiltration – review how groundwater table level has been confirmed and how ground will be protected from compaction during construction. Review risk of infiltrating close to buildings. Review how infiltration on brownfield sites has been assessed. The level of analysis required LLFA should reflect the risk of failure, scale of development and complexity of drainage. Sensibilty check to be performed LLFA for each subcatchment, comparing top level of storage, and lowest level of contributing areas. Review of inlets, outlets, flow LLFA controls, storage, edge details, connection details to receiving watercourse / sewers London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

Deliverable Key design points Key evaluation points hydraulic Drawings should confirm Sensibility check to be calulations & volumes provided and refer back performed to ensure that drawing to hydraulic analysis sufficient storage is provided to volumes requirements. Drawings meet hydraulic calculations. match references / annotations should clearly relate to calculations. Designers To consider construction, Demonstrate safe design for hazard & risk maintenance / operation by users and operatives of the assessment. personnel and day to day site scheme. use by public. Long sections Cross sections should not use Review in general, side slopes and cross exaggerated vertical scales to and depths shown. sections allow proper understanding of how scheme will actually look Responsibility to check LLFA LPA & LLFA LPA & LLFA Detailed Design Planting Outline any SuDS specific Ensure plants from accredited LPA & LLFA design & schedule planting requirements. source to minimise risk of invasive species. Landscape Integrate SuDS within the wider Check that the SuDS network is LPA & LLFA design drawings Consents & permits landscape design Vary and can include: discharge consents; offsite works & 3rd party access consent. The list of accessible, multifunctional and contributes to the overall landscape quality. Check that relevant consents are in place or can be obtained in principle. LPA & LLFA & EA & IDB & WASC 74 required consents may be initially defined at pre-app discussion. Maintenance Key plan (1 side of A4) detailing Maintenance type & cost is LPA & LLFA the maintenance regime and appropriate & proportionate and identifying key maintenance features are easily accessible. locations such as outlets and Design achieves passive flow control locations. maintenance where possible. Adoption Confirmation of commitment to Review that sufficient safeguards LPA, LLFA, arrangements adopt aspects of the scheme being offered for adoption. are in place for the long term maintenance and operation of WaSC & Highways & IDB Confirmation of ownership and the drainage. Consider the & WASC maintenance responsibilities for potential impact of replacement all parts of the SuDS scheme of propriety products. which are not being adopted. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

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