| Conditions or Reasons: | 9)
No development shall commence until a detailed surface water drainage scheme, to manage surface water runoff from the development for up to and including the 1 in 100 year event (+40%CC), and a maintenance and management plan for the scheme has been submitted to and approved in writing by the Local Planning Authority. The discharge from the development will be via soakaway. The final detailed design shall be based on an agreed drainage drawing (Ref: Parsons, 21262-002, 4/11/2021) and DEFRAs Non-statutory technical standards for sustainable drainage systems (March 2018) and shall be implemented and maintained as approved. Maintenance will ensure the system functions as designed for the lifetime of the development. Any variation to the connections and controls indicated on the approved drawing which may be necessary at the time of construction would require the resubmission of those details to the Local Planning Authority for approval. The applicant should address the following points 1, 2, 3, 4, 5, 8 and 9 when submitting details to discharge the condition:
1. Culverting of existing watercourses will not be permitted.
2. Any watercourses within or adjacent to the site should be included in the maintenance and management plan, even if there is no discharge to them. This would be a riparian ownership issue but leaving it as such is no longer acceptable.
3. We will require full drainage drawings showing all connections, control features, storage, inverts etc.
4. Under Central Bedfordshire Council and IDB bylaws, any watercourse within or adjoining the site boundary will maintain a 9m development free easement (on the development side), unless otherwise agreed with the relevant drainage authority. This applies to all watercourses, where water is present for all or some of the year, including those not clearly stated on mapping, topography or planning documents.
5. We expect the use of the SuDS management train, single point SuDS will be challenged. Where the use of permeable surfacing is proposed, this should be designed in accordance with the 'CIRIA RP992 The SuDS Manual Update: Paper RP992/28: Design Assessment Checklists for Permeable/Porous Pavement.
8. Land drainage Consent under the Land Drainage Act 1991 must be secured to discharge surface water to an existing watercourse/ditch, and details of this provided
with the full detailed design. An easement should be provided on the developable side of the watercourse to allow for access for maintenance, this should be 9m but
may depend on the maintenance requirements considered appropriate.
9. Evidence of permission for surface water discharge connection to any other system (if it is found that soakaways are not (fully) viable) is required before work
commences on site.
Reason: To ensure the approved system will function to a satisfactory minimum standard of operation and maintenance and prevent the increased risk of flooding both on and off site, in accordance with CBC Local policy CC3 to CC5 and NPPF Paras 159 to 169 Inclusive of foot notes 54 to 56 and its supporting technical guidance. |
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