Water Cycle Study - East Devon District Council

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Ref EWCS April 2010 Exeter and East Devon Water Cycle Study 4.5.10 At this outline phase of Water Cycle Study, only a broad assessment of surface water management potential has been undertaken for each of the development growth areas, using the criteria defined in Table 4.3 below. 4.5.11 The assessment was based upon a desk-study of readily available data and analysis and has used a simple traffic light approach to assess the potential for SuDS, with green indicating a positive outcome, yellow indicating a notable outcome, and red indicating a critical outcome. This assessment provides an indication of the constraints to and opportunities for sustainable surface water management in the areas of future growth. Detailed intrusive investigations will be needed by developers to support their proposals as they come forward. 4.5.12 The assessment results are presented in Table 4.4 and Table 4.5 overleaf, followed by a discussion of the criteria and the key issues identified. Table 4.3 – Surface water management potential - assessment criteria Key criteria Permeability of underlying geology (determined from British Geological Survey plans) Ground water source protection zones (SPZ) Impact on SuDS potential - Definition Critical Notable Positive Poor potential for drainage by infiltration due to low permeability. Development located within Inner SPZ or combination of Inner, Outer, & Total catchment SPZs. Outfall availability Outfall is >500m from site boundary. Urbanised area 76-100% of the surrounding area is urbanised. Overall assessment More than one criteria assessed as ‘critical’. Moderate potential for drainage by infiltration due to moderate permeability. Development located within Outer or Total catchment SPZ. Outfall is 0-500m from site boundary. 26-75% of the surrounding area is urbanised area. Up to one critical criteria, the remainder notable or positive Good potential for drainage by infiltration due to high permeability. Development located outside of Total catchment SPZ. Outfall available on-site. 0-25% of the surrounding area is urbanised area, No critical criteria and two or more criteria ‘positive’. 34
Exeter and East Devon Water Cycle Study Table 4.4 – Surface water management potential – assessment results for East Devon settlements Settlement Exmouth Budleigh Salterton Newton Poppleford Ottery St Mary Sidmouth Honiton Underlying geology Beer * Seaton Colyton Axminster Source protection zones (SPZ) Outfall availability * = Underlying geology highly permeable but prone to dissolution. Urbanised area Overall assessment Table 5.5 – Surface water management potential – assessment results for the core study area (to be read in conjunction with Figure 2.1) Site Ref. Teignbridge Exeter City East Devon T1 C1 C2 C3 C4 D1 D2 D3 D4 E0 E1 E2 E3 E4 Underlying geology Source protection zones (SPZ) Outfall availability Urbanised area Overall assessment 35 Ref EWCS April 2010
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Water Cycle Study - East Devon District Council

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