Part I - Other Considerations - Richmond Valley Council

Richmond Valley Development Control Plan 2012• The sites natural infiltration and detention features should beutilised where practical. This includes retaining key vegetationfeatures to slow down water movement.• Infiltration and detention should be used in the conveyance systemwhere possible.• Using driveways and culverts as check dams may slow downstormwater in the conveyance system and encourage infiltration.‣ Infiltration, retention and detention system should be designed with dualpurpose where possible. When implementing dual purpose adequatecontrols and signage must be provided to protect public safety.Examples of dual purpose include, but are not limited to:• Sports fields and detention areas.• Landscaping and infiltration areas, detention, retention ponds.• Car park areas and detention.• Open space, parkland and infiltration, detention areas and ponds.‣ The creation of impermeable area and increases to stormwatergeneration should be reduced as much as practical. Measures mayinclude, but are not limited to:• Road widths should be kept to the minimum required by Councilspecifications.• Porous/ permeable pavers should be used where site conditionsallow for pedestrian, light vehicles traffic areas, street car parkingand footpaths.• Using natural drainage designs and existing site features instead ofpiped and concreted drainage features where site conditions allow.• Develop a train of stormwater treatment from the lot level to streetsystem to discharge from the development.‣ Increases to stormwater velocities via concentration and channelling offlow should be avoided as much as practical. Measures may include, butare not limited to:• Allowing stormwater to sheet flow over vegetated filter strips toencourage infiltration, decrease velocities and treatment beforeentry into the conveyance system.• Use natural drainage designs and existing site features instead ofpiped and concreted drainage features where site conditions allowto reduce stormwater velocities and encourage infiltration.• Streets should be designed so that they run parallel to the gradientof slopes where practical. Having long sections of street runningdirectly down a slope should be avoided where practical.‣ Significant topographical features, vegetation features and naturaldrainage features should be retained where possible.‣ Energy dissipaters should be provided at the outlets from all formeddrainage systems where an outlet exits to a water body, dunal system,bushland, area of erosive soils, bio retention device, grass swale,infiltration area, wetland, vegetated filter strip or other easily disturbedenvironment.Part I – Other Considerations – Water Sensitive Urban Design I.104