For Equal Flow Distribution and Proportional Distribution by Area, you would need a shapefile containing polygons that each represent the area associated with a billing meter containing a lump sum demand . These methods provide demand allocation that is distributed based on the size and shape of these areas. The first technote that Sushma sent has some examples that may help. I would also reccommend our Advanced Water Distribution Modeling and Management book, which contains more information and examples on load distribution (chapter 4.1) www.bentley.com/.../AWDM.htm
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