It concludes that in 2005-14, annual expenditure requirements in developing countries amount to USD 72 billion, divided as follows: USD 18 billion to increase coverage and USD 54 billion to maintain and renew existing facilities for served populations. With the construction of wastewater management networks for an increasingly urbanised population, the cost of sewerage and wastewater treatment will also escalate (in a mature networked system, these costs normally exceeds that of water supply). It is therefore necessary to consider the full set of financial implications of extending first-time access, particularly to networked services. Non-uniform flat rates (in use in the United Kingdom and in the former Soviet Union) can be based on features which relate to water consumption (e.g. efficient appliances, water reuse).