BS 8595:2013 pdf download
BS 8595:2013 pdf download.Code of practice for the selection of water reuse systems.
5.2.6 Carbon reduction targets
Information about the carbon footprint of local water supply, wastewater treatment and water reuse systems should be taken Into account during scoping, evaluation, planning and selecting the water reuse systems, as water reuse systems might help to reduce the amount of operational carbon consumed in the abstraction, treatment and conveyance of municipal water supply.
NOTE lnformat,on about local carbon reduction targets can be obtained from the local water serwce prowide’s.
5.2.7 Local planning policies
Any policies adopted by the local planning authority promoting water reuse systems should be taken Into account during scoping. evaluation, planning and selecting the water reuse systems.
NOTE lnformat,on about local planning policies can be obtained from the local planning authority
5.2.8 Client requirements
The client’s own reasons for selecting water reuse systems, such as a reduction in water bills, should be taken into account during scoping, evaluation, planning and selecting the water reuse systems.
5.3 Project objectives: prioritization of key considerations
Once the key considerations have been determined, the priority or priorities of the project should be identified.
Where local availability of water or lack of capacity in the local water supply infrastructure are identified as the primary design considerations, a water reuse system should be installed to minimize consumption of mains water supply.
Where lack of capacity in the stormwater drainage infrastructure is identified as the primary design consideration, priority should be given to an integrated design of rainwater and stormwater harvesting as a method of reducing the volume of rainfall runoff.
Where lack of capacity in the wastewater and foul drainage infrastructure is identified as the primary design consideration, priority should be given to greywater reuse as it might help to reduce the volume of discharge of wastewater into the foul drainage system.
NOTE There might be a need for increased storage and increased retention times, which might require increased treatment to maintain the quality of treated reclaimed water for the longer period
5.4 Results of initial appraisal
The results of the initial appraisal should be discussed with the client and a decision should be made as to whether to proceed with the project and, if so, what the priority considerations are.
6 System selection
A water reuse system should be selected based on the following criteria:
a) physical constraints (see Clause 7);
b) sources and end uses (see Clause B);
C) supply and demand balance (see Clause 9);
7.3 Topography and ground conditions
The topography and geology of an area should be evaluated as they affect:
• the cost of excavation for laying pipes, installing tanks and other related infrastructure;
• the cost of pumping of treated reclaimed water; and
• the cost of disposing of excavated soil.
NOTE 1 Costs for disposal can be h.gh if the ground is classed as contaminated” and requires disposal to a licensed facility ox the soil to be treated on site.
NOTE 2 General topographic information can be obtained from the Ordnance Survey and other companies providing land surwy in formation. However, a topographical survey of the site might be necessary.
NOTE 3 Geological information can be obtained from 8ritish Geological Survey.
Land contamination information can be obtained from the local environment agency
offices (the Environment Agency for England and Wales, SEPA or the Northern
Ireland Environment Agency) or from other data service providers.
NOTE 4 Annex 8 gives examples of how topography and ground conditions might affect the selection and siting of the water reuse system.
8 Step 3: Sources and end uses
The sources of reclaimed water and the potential end uses of treated reclaimedwater should be identified.This should be done before evaluating the supply-demand balance.
NOTE Table 2 shows the type of end uses, the suitable sources of reclaimed waterand the corresponding treatment standards for particular end uses.
