The Planning System and Flood Risk Management - Offaly County ...

79Photo 2: Roof Garden, Sargfabrik, ViennaPhoto 3: Treatment of car park surfacesA broad overview of the philosophy behind SuDS and techniques that areappropriate under different circumstances is provided in CIRIA publicationC609 SuDS – hydraulic, structural and water quality advice. In addition, CIRIApublication C697 the SuDS Manual, provides further detailed information.4 Building Design and Internal Layout4.1 Floor LevelsRaising threshold and floor levels above expected flood levels can also beused to reduce the risk of flooding to a property. This is typically achievedby raising floor heights within the building structure through either a suspendedfloor arrangement or raised internal concrete platforms.These approaches are most commonly adopted in developments that couldbe subject to limited flood depths (i.e. less than 2m) and where adjustmentscould help reduce potential flood losses. When designing an extension ormodification to an existing property, an appropriate reduction measure wouldalso be to ensure the threshold levels into a property are above the designPlanning Guidelines