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Figure 2.1
Costs of conventional sewerage, shallow (i.e. simplified and,
in fact, condominial) sewerage and on-site sanitation as a function of
population density in the City of Natal, Rio Grande do Norte,
northeast Brazil (from Sinnatamby, 1983, 1986) |
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which is the lower-cost solution: on-site systems or simplified sewerage. Lower cost in this context means both economic and financial, and must include operation and maintenance costs as well as investment costs. |
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2.2.3
The Case for Settled Sewerage. |
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Here also the case has to be made on economic or financial grounds: is settled sewerage cheaper than on-site systems or |
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