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Agree fully with Brian. In Rwanda we also used the smaller pipe diameters to distribute the flow to storage tanks in each area in proportion more or less to the population served. This meant that over consumption / leaks in one area only affected that area. We were also very careful with the main line laying, trying to ensure that they fell and then rose again at a constant rate of say 3-5% with high points always below the level of the downstream receiving tank if at all possible, and low points at the limit of the pipe pressure rating.