Water Cycle Study - East Devon District Council

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Ref EWCS April 2010 56 Exeter and East Devon Water Cycle Study Table 6.1 Assessment of consented capacity at wastewater treatment works (based upon Environment Agency Discharge Consent data) Sub Region Growth Area Possible Allocation Location Relevant WwTW Receiving Water Tidal or Freshwater Discharge Maximum Dwelling Forecast to Test (to 2026) Exeter City ECC Boundary Exeter Sites (C1,C2,C3,C4) 15,000 Teignbridge South West of Exeter Alphington Area (T1) 2,000 East Devon East of Exeter Commercial Urban Extension (E9,E10,E11,E12) Exeter Airpot/Science Park/Skypark (D1,D3,D4) Exeter - Countess Wear Exe Estuary Estuarine 4,500 N/A Consented available capacity (dwellings) 4 Commercial IMFT (D2) N/A Cranbrook New Community (E0,E1,E2,E3,E4,E5,E6,E7,E8) Cranbrook River Clyst Freshwater 10,000 7,500 Axminster (E13) Axminster (Kilmington) River Axe Freshwater 1,000 2,500 Elsewhere in East Devon – Growth at existing settlements Beer (E14) Seaton South Pumped to Seaton N/A 1,000 Seaton (E21) Seaton South Axe Estuary Estuarine 1,000 Budleigh Salterton (E15) Exmouth Maer Lane Pumped to Exmouth N/A 1,000 Exmouth (E17) Exmouth Maer Lane Lyme Bay Coastal 1,000 Colyton & Colyford (E16) Colyton Axe Estuary At tidal limit 1,000 600 Honiton (E18) Honiton River Otter Freshwater 1,000 1,800 Newton Poppleford (E19) Otterton Lyme Bay Coastal 1,000 2,000 Ottery St Mary (E20) Ottery Town River Otter Freshwater 1,000 2,000 Sidmouth (E22) Sidmouth Lyme Bay Coastal 1,000 5,000 4 The dry weather flow has been calculated using the following assumptions. Per capita consumption has been assumed to be 120 litres per head per day for new properties, occupancy rate has been assumed to be an average of 2.2, and an infiltration rate of 40% of dry weather flows has been assumed. 30,000 500 -2,500
Exeter and East Devon Water Cycle Study Table 6.2 Forecast WwTW flows for development scenarios Relevant WwTW Current BOD 95%ile consent Current Amm 95%ile consent Consented DWF 2011 DWF (m 3/day) Forecast calculated dry weather flow 5 2016 DWF (m 3/day) 57 Ref EWCS April 2010 2021 DWF (m 3/day) 2026 DWF (m 3/day) Exeter - Countess Wear 20 10 40,486 31,392 33,378 35,365 37,351 Cranbrook 14 2 2,810 924 1,848 2,772 3,696 Axminster (Kilmington) 25 N/A 2,229 1,317 1,410 1,502 1,595 Exmouth Maer Lane 250 (max) N/A 9,186 10,297 10,482 10,666 10,851 Colyton 20 N/A 1,045 892 985 1,077 1,170 Honiton N/A N/A 3,115 2,542 2,635 2,727 2,820 Ottery Town 30 N/A 1,063 461 646 830 1,015 Otterton 40 N/A 1,643 948 1,041 1,133 1,226 Seaton South 20 N/A 2,300 2,285 2,470 2,654 2,839 Sidmouth 250 (max) N/A 6,331 4,427 4,520 4,612 4,705 Notes: The flows from Budleigh Salterton are pumped to Exmouth, Maer Lane and are included in the figures for Exmouth, Maer Lane provided in the table above. Flows from Newton Poppleford pass to Otterton WwTW. The flows from Beer are pumped to Seaton South WwTW and are included in the figures for Seaton South provided in the table above. 5 The dry weather flow has been calculated by using the following assumptions. Per capita consumption has been assumed to be 120 litres per head per day for new properties, occupancy rate has been assumed to be an average of 2.2, and an infiltration rate of 40% of dry weather flows has been assumed.
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