… 2 - Treatment The extent of treatment required depends on the land use, the level of pollution prevention in the catchment and for groundwater the natural protection afforded by underlying soil layers. High hazard sites will have a higher potential pollution load and higher potential maximum pollution concentrations. They therefore tend to require more treatment than low hazard sites…
… in order to deliver discharges of an acceptable quality. The SuDS Manual sets out minimum water quality management requirements for discharges to receiving surface waters and groundwater for various land use types, Table 11. The site consists of two land use types: 1. Roofs to houses classed as residential roofs, very low pollution hazard. 2. The access road and parking areas classed…
… as property driveways/low traffic roads, low pollution hazard. RMB Consultants (Civil Engineering) Ltd Former ADAS Site, Olantigh Road, Wye, Ashford, TN25 5EP Foul and Surface Water Management Strategy 37 Land use Pollution hazard level Requirements for discharge to: surface waters groundwater Residential roofs Very low Removal of gross solids and sediments only Individual…
…, it should be considered as having the same mitigation indices as a pond. Table 11. Water quality requirements for discharge to surface waters and groundwater. For each land use type a simple index approach is appropriate which involves the following steps: 1. Allocate suitable pollution hazard indices for the proposed land use, Table 12. 2. Select SuDS with a total pollution mitigation…
… index that equals or exceeds the pollution hazard index, Table 13. 3. Where the discharge is to protected surface waters or groundwater, consider the need for a more precautionary approach. RMB Consultants (Civil Engineering) Ltd Former ADAS Site, Olantigh Road, Wye, Ashford, TN25 5EP Foul and Surface Water Management Strategy 38 Land Use Pollution hazard level…