Incorporate all, 2015). Different types of SuDS

Incorporate sustainable surface and foul water system.

Prepare a separate written specification and justification Sustainable drainage systems (SuDS) are used to harvest andmanage rainwater close to where it falls by controlling runoff on the surface, allowingrainwater to soak into the ground, promoting evapotranspiration and usingrainwater as a resource (Ashley et all, 2015). Different types of SuDS that canbe used are: rainwater harvesting, green roofs, infiltration systems, filterstrips and drains, swales, attenuation storage tanks etc. As the current project only incorporates accommodation forone person the most suitable SuDS system would be a rainwater harvesting system.Other systems may not be viable because of the high cost relative to thebenefits. Rainwater harvesting (RWH) systems are used to collect rainwaterfrom roofs to be used for various purposes like flushing toilets, washingmachines, irrigations etc. The main advantages of a RWH system are: reducingthe volume of runoff from a site; delivering sustainable water demand (Ashleyet all, 2015).There are three main types of RWH system: gravity-basedsystems, pumped systems and composite systems (Ashley et all, 2015).Storage tanks should be placed in a safe, secure locationeither underground, indoors, on roofs or adjacent to buildings (depending onthe intended uses of the water).

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Tanks that are located underground tend tohave improved performance with respect to the control of water temperature,reducing bacterial growth in summer and frost damage in winter. Where the tankhas to be installed close to the building, structural considerations such asthe depth of the foundations and the water tightness of the RWH unit and itsoverflow provision are particularly important. The presence of undergroundutilities may also constrain the location of the tank.The primary parameters used for calculating the size of thestorage are:? the storm rainfall depth that is to be captured – 60mm inUK Average (SuDS Manual)? average annual rainfall (AAR) 694 mm Met Office Derby? daily demand for non-potable water 40l average http://www.

waterwise.org.uk/pages/save-water.

htmlWater consumption calculator? building occupancy – 1 person? contributing surface area. Calculate what the roof areawill be http://source4me.co.uk/calculate_roof_area.

htmCalculations showed water tank capacity at 1 metric cube  ReferencesAshley, R., et al.,2015. The SuDsManual.

London: CIRIA. Available athttps://www.ihs.com Accessed 14 January2018.

BS 8515:2009+A1:2013 Rainwater harvestingsystems. Code of practiceBS 8542:2011 Calculating domestic waterconsumption in non-domestic buildings. Code of practiceBS 8595:2013 Code of practice for theselection of water reuse systemsEA (2010) Harvesting rainwater fordomestic uses: an information guide.Incorporate sustainable surface and foul water system.Prepare a separate written specification and justificationSustainable drainage systems (SuDS) are used to harvest andmanage rainwater close to where it falls by controlling runoff on the surface, allowingrainwater to soak into the ground, promoting evapotranspiration and usingrainwater as a resource (Ashley et all, 2015).

Different types of SuDS that canbe used are: rainwater harvesting, green roofs, infiltration systems, filterstrips and drains, swales, attenuation storage tanks etc. As the current project only incorporates accommodation forone person the most suitable SuDS system would be a rainwater harvesting system.Other systems may not be viable because of the high cost relative to thebenefits.

Rainwater harvesting (RWH) systems are used to collect rainwaterfrom roofs to be used for various purposes like flushing toilets, washingmachines, irrigations etc. The main advantages of a RWH system are: reducingthe volume of runoff from a site; delivering sustainable water demand (Ashleyet all, 2015).There are three main types of RWH system: gravity-basedsystems, pumped systems and composite systems (Ashley et all, 2015).

Storage tanks should be placed in a safe, secure locationeither underground, indoors, on roofs or adjacent to buildings (depending onthe intended uses of the water). Tanks that are located underground tend tohave improved performance with respect to the control of water temperature,reducing bacterial growth in summer and frost damage in winter. Where the tankhas to be installed close to the building, structural considerations such asthe depth of the foundations and the water tightness of the RWH unit and itsoverflow provision are particularly important. The presence of undergroundutilities may also constrain the location of the tank.

The primary parameters used for calculating the size of thestorage are:? the storm rainfall depth that is to be captured – 60mm inUK Average (SuDS Manual)? average annual rainfall (AAR) 694 mm Met Office Derby? daily demand for non-potable water 40l average http://www.waterwise.org.uk/pages/save-water.htmlWater consumption calculator? building occupancy – 1 person? contributing surface area.

Calculate what the roof areawill be http://source4me.co.uk/calculate_roof_area.htmCalculations showed water tank capacity at 1 metric cube  

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