Flooding is not an issue on this site. The majority of the site is located within Flood Zone 1, which has a ‘Low Probability’ of flooding. A small part of the northern section of the site associated with the watercourse which drains into the Littlemore Brook is located within Flood Zone 2 ‘Medium Probability’ and Flood Zone 3 ‘High Probability’. The masterplan reflects these areas of constraint by avoiding any development within them.
It is proposed to manage surface water from the proposed development through the incorporation of Sustainable Drainage Systems (SuDs). Infiltration drainage systems will be utilised where ground conditions permit, although investigations show these have limited potential. Therefore, it is proposed to use ponds and swales within the green corridors, combined with permeable paving and green roofs within the development parcels to treat and store runoff. Taken together these measures will ensure that flows from the site to nearby watercourses will be limited to the same level as run-off from greenfields. The proposed SuDS features can also provide ecological and biodiversity benefits within the open spaces and the green corridors of the site.