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. Under a Master Meter contract, Denver Water reads the contracting water district's master meters and bills the district for wholesale water use. The district establishes its own water rates and bills the individual customers. Denver Water maintains the master meters but the district is responsible for master meter replacement and all district distribution system operation and maintenance. Denver Water currently has 25 Master Meter contracts serving approximately 69,000 accounts. . Changing Patterns of Use t, The pattern of water use is changing. Daily and hourly peaks are declining relative to average demands, probably a result, in large measure, of increased use of automatic sprinkler systems as well as Denver Water's conservation programs and education about the value of water as a precious resource. This "smoothing" of demands has particular implications for the treated water system because most facilities are sized to meet either daily or hourly peaks. . The daily load shape is driven largely by us<\ge patterns of singlecfamily residential customers. Historically, the typical summer daily hydrograph had a single, large afternoon peak, caused by outdoor watering demand, and a smaller morning peak. Today, daily demands exhibit two fairly equally-sized peaks. The afternoon peak is lower and early morning use is now much higher than has historically been the case. These differences are illustrated in Figure I11-6. . Figun I11-6 . Maximum Day Hydrograph 700 600 ,., ~ Q 500 " ~ Co ~ 400 = <..1 300 = ~ 200 :E 100 0 :0: :0: :0: :0: :0: :0: :0: :0: :0: :0: :0: :0: ..: ..: ..: ..: ..: ..: .. .. .. .. .. .. .... .... .. .., ,. .... .... .. .., ,. ~ ~ ~ ~ TIME . 1995 .. 1968 . . 24 .