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Page 29 Table 3.5 Polluting industries Description Score More than 50% of the effluent is generated by industry 10 2550% of effluent is generated by industry 5 Less than 251 of waste effluent is generated by industrial sources 1 Note: As these guidelines relate only to sewerage the effect of industrial effluent strength on treatment costs has been ignored. Table 3.6 Unit cost of construction Unit cost Score Unit cost Score 40 00045 000 10 65 00070000 5 45 00050 000 9 70 00075 000 4 50 00055 000 8 75 00080 000 3 55 00060 000 7 80 00085 000 2 60 00065 000 6 85 00090 000 1 Table 3.7 Tourist impact Description Score Over 80% of the community's income is generated by tourism 10 4080% of income is from tourism 5 No significant tourism income 1 Table 3.8 Consumers' ability/willingness to pay for sewerage Description Score Community can/will repay the full capital and operating costs of the scheme 10 A 50 per cent subsidy is required on the construction cost 7 The community can only afford/is willing to pay operating costs 4 A subsidy is required to make operating costs affordable 1 of the criteria in the selection process. The problem with weighting systems is that it is difficult to apply them objectively. In Table 3.1 'tourist impact', for example, is shown as three times more important than 'projected population'. This is a
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