Preliminary Drainage Assessment
This service investigates and advises on the most appropriate drainage solutions and provides a written report to demonstrate to the Planning Authority that the site drainage can be adequately dealt with in order to gain Planning Permission.
A Preliminary Drainage Assessment includes the following:
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Review existing drainage records provided by Client.
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Advise on location and Building Regulation Part H percolation test method.
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Analyse percolation test results to determine suitability for soakaways.
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Where soakaways are not suitable, assess the impermeable areas and 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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Official Developer Enquiry to Sewerage Operator
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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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Assess options for the site.
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Provide general information on the options available e.g. adoption, SUDS.
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Provide conclusion of anticipated solutions for foul sewerage disposal, surface water disposal and access road drainage.
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Recommend next steps to be undertaken in the detailed design.
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