| Conditions or Reasons: | 6)
Development shall not begin until a detailed Surface Water Drainage Scheme for the site, based on sustainable drainage principles and an assessment of the hydrological and hydro geological context of the development, has been submitted to and approved in writing by the local planning authority. The scheme shall subsequently be implemented in accordance with the approved details before the development is completed.
The scheme shall be based upon the principles given within the Flood Risk Assessment dated November 2011, reference 3855/02, compiled by Stuart Michael Associates, and shall also include:
Detailed post-development surface water runoff calculations, accounting for impermeable areas, for the Q1 (or QBAR), Q30, Q100 and Q100 PLUS CLIMATE CHANGE storm events. This shall be done for the demonstrated critical storm duration and season;
Detailed drawings showing the location, dimensions, levels, gradients and reference numbers of the proposed drainage system;
Detailed results of surface water system modelling for the above-mentioned storm events demonstrating suitable management of surface water and performance of the proposed system;
Details of flood flow routing in the event of system exceedance or failure, demonstrating that surface water flood risk from the site to adjacent or downstream areas will not increase, and such flows can be appropriately managed on site;
Full design details including cross- and long-sections, levels (including design and water levels), dimensions and gradients, of the proposed attenuation pond and flow control device (including the manufacturer's flow curve for vortex flow controls), demonstrating suitable system performance for discharge rates no greater than those as given in section 5.30 of the agreed FRA;
Assurances that the capacity of the proposed water butts for each property, as detailed in section 5.19 of the FRA, shall not be included as part of the storm water attenuation volume;
Analysis of the capacity of the receiving watercourse, demonstrating that the watercourse can receive flows as proposed, and that the culvert downstream of the receiving watercourse will not be overwhelmed;
Details of any erosion control measures proposed on the receiving watercourse to mitigate the concentration of discharge to a singular point in the watercourse;
Details of the proposed maintenance and/or adoption regime, or evidence from the appropriate party that maintenance/adoption details have been agreed.
Reason: To provide for the consideration of the Surface Water Drainage Scheme ahead of the commencement of development to prevent the increased risk of flooding, and ensure future maintenance of the drainage system in accordance with policy 49 of Development Strategy for Central Bedfordshire Revised Pre-Submission Version June 2014. |
13)
No development shall take place in an area of the development as identified on the areas plan required by condition 3 of this permission until details of the plans and sections of the proposed estate roads in that area, including gradients and method of surface water disposal have been submitted to and approved in writing by the Local Planning Authority and no building within that area shall be occupied until the section of road which provides access thereto has been constructed (apart from final surfacing) in accordance with the approved details.
Reason: To ensure that the proposed road works are constructed to adequate standard in accordance with policy 43 of the Development Strategy for Central Bedfordshire (Revised Pre-Submission Version June 2014.) |
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