Surface Water Run-off Appraisal
Purpose
Investigate and advise on the most appropriate surface water drainage solutions and provide two reports. These will identify how the Mandatory Elements of the Code for Sustainable Homes (CSH) Category 4: Surface Water Run-off will be achieved; satisfy the mandatory evidence requirements for Sur1 and could achieve the 2 credits available for Sur2.
Included items for EA Flood Zone 1 (<1 ha)
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Review existing drainage records provided by Client.
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Advise on location and method of the Building Regulation Part H percolation test method, and analyse percolation test results to determine suitability for soakaways.
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Where soakaways are not suitable, assess the impermeable areas and calculate the peak rates of run-off.
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Calculate the volume of run-off pre and post-development and identify how the additional volume could be dealt with (by infiltration, rainwater recycling or attenuated discharge).
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Consult with Environment Agency, Sewerage Operator, Highway Authority, Planning Authority, Building Control and land owners if appropriate.
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Level 1 FRA - Screening Study to identify any flooding or surface water management issues or confirm the site is at low risk of flooding.
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Assess and provide information on the options for the site, concluding the anticipated solutions for the development of surface water disposal.
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Recommend next steps to be undertaken in the detailed design.
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Excluded items
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Official Developer Enquiry to Sewerage Operator
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Foul sewerage investigations.
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Service enquiries and investigations.
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Site visit.
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Cost of Contractor's plant, equipment and materials.
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Arranging and monitoring the BRE Digest 365 soakaway tests.
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Topographical survey.
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Detailed Design and Designer's Risk Assessment.
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To find out about our other Code for Sustainable Homes services, see the Sustainable Homes section of this website.
