stone-filled trenches could hold without undue delay.
Constructed between June and September 2005 the pitches have still to establish but to date all surplus water run-off has been satisfactorily controlled. In order to improve the porosity of the clay loam soil three applications of gypsum were made each at 5 tons per hectare. Slit drains at 1m spacing are to be installed in May and thereafter sand dressings will be made annually for the first five years at least. The established swales have proved to be a positive means of controlling and temporarily storing
surface water flow and with a depth of 300mm and shallow gradient on either side, they are easily mowed without any scalping.
Urban redevelopments
Urban redevelopments are currently a priority and the provision of an adequate drainage outfall or temporary storage is a main concern where properties below the site would be subject to damage from flooding. Attenuation systems assist in controlling and restricting peak-flow outfall rates. Yet outfall to lower
ground is inevitable on heavy clay soils at the time of persistent rains in the winter. The great benefit of attenuation is the ability to limit this flow rate to one that would be expected from a greenfield site. The calculations in accordance with the MAFF/ADAS No 345 publication ensure that an outfall can be created to adjoining lower ground where no natural watercourse exists - at a rate that would be reasonably expected if the site had not been developed.
urban redevelopments are currently a priority
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