3. Temporary flood resistance. Table 4. Details of floodwater ingress Table 5. Resilience measures. Table 6. FRR (m/s) for a Typical Residence (designed for a larger FRR) (Kelman, 2003) Table 7. Price for FSS based on a standard 50m2 semi-detached house. Table 1. Permanent resistance measures. Measure Description Cost Earth Bund An bund may provide flood defence for a £400/metre run (1) Walls single property or a community. Expert £150/day auxiliary engineering design is needed with extensive pumps groundworks. There can be problems with seepage under/through walls and via garden wells. Auxiliary pumps usually required. Boundary Walls Concrete walls or part concrete part wooden run (1) and Fences fencing can be installed to provide flood Concrete wall. Not barriers for individual properties or included is any communities. Walls/fences can have sealed extra work gates installed. There may be problems again involved sealing with seepage, footings on to clay and below ground. deflection of water to neighbouring properties Raising Building If allowed by the existing external door lintols, £800 per door (1) Thresholds the door and threshold may be raised by say two courses of brickwork. Generally only for duration floods between 150-300mm deep. Storm Porch to If is not possible to raise the external doorway £4500 per porch(1) External a raised porch may be constructed in front of Doorway the door to again resist up to 300mm. External porch doors will need to have extra locking system (£300) Cementitious Two coat work eg. Renderstop. Not run (1) renders breathable. Bituminous Brush applied. Two coat work eg. Technoseal. £50/metre run (1) coatings Susceptible to UV light but can be used below ground level. Not breathable. veneer Extra skin of brickwork to external wall, must £100/metre run (1) go down to foundation. Water Resistant Walls need careful attention to make them £30/m2 (3) External Walls flood resistant down to the foundations. This involves excavation for attention to service/entry points and cracks with repointing using a 1:3 mortar below damp proof course (DPC) and 1:2:9 above DPC.
3. Temporary flood resistance. Table 4. Details of floodwater ingress Table 5. Resilience measures. Table 6. FRR (m/s) for a Typical Residence (designed for a larger FRR) (Kelman, 2003) Table 7. Price for FSS based on a standard 50m2 semi-detached house. Table 1. Permanent resistance measures. Measure Description Cost Earth Bund Walls An bund may provide flood defence for a single property or a community. Expert engineering design is needed with extensive groundworks. There can be problems with seepage under/through walls and via garden wells. Auxiliary pumps usually required. £400/metre run (1) £150/day auxiliary pumps Boundary Walls and Fences Concrete walls or part concrete part wooden fencing can be installed to provide flood barriers for individual properties or communities. Walls/fences can have sealed gates installed. There may be problems again with seepage, footings on to clay and deflection of water to neighbouring properties run (1) Concrete wall. Not included is any extra work involved sealing below ground. Raising Building Thresholds If allowed by the existing external door lintols, the door and threshold may be raised by say two courses of brickwork. Generally only for duration floods between 150-300mm deep. £800 per door (1) Storm Porch to External Doorway If is not possible to raise the external doorway a raised porch may be constructed in front of the door to again resist up to 300mm. External porch doors will need to have extra locking system (£300) £4500 per porch(1) Cementitious renders Two coat work eg. Renderstop. Not breathable. run (1) Bituminous coatings Brush applied. Two coat work eg. Technoseal. Susceptible to UV light but can be used below ground level. Not breathable. £50/metre run (1) veneer Extra skin of brickwork to external wall, must go down to foundation. £100/metre run (1) Water Resistant External Walls Walls need careful attention to make them flood resistant down to the foundations. This involves excavation for attention to service/entry points and cracks with repointing using a 1:3 mortar below damp proof course (DPC) and 1:2:9 above DPC. £30/m2 (3)
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