Res 2016-137/approving a Water Master Plan to guide the future maintenance and extension of the City’s Water Infrastructure

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Alan Plummer Associates, Inc. Water Master Plan Update 2016 4.3 DIURNAL CURVES The diurnal curve refers to the variation of water demand over the course of a single day. The AMI) data would allow the identification of a diurnal curve for each meter in the distribution system. However, as hydraulic models will only accept ten to twenty such curves, the data were aggregated into 15 representative diurnal curves as a function of usage type (domestic or irrigation), pressure plane, and meter size. During model calibration, these representative curves (listed in Table 4-4) were identified by averaging AMI data for the calibration period. The curves for each pattern were derived from 11 days of 2014 data gathered for model calibration. These curves are plotted and included in Appendix A. Table 4-4: Diurnal Curve Patterns Developed from AMI Data Pattern Pressure Meter Usage No. Plane Size(s) 1 Irrigation SWTP - all sizes - 2 Irrigation -all other planes- - all sizes - 3* Domestic SWTP >= 4* Domestic Upper >= 5* Domestic SWTP 6* Domestic Upper 7 Domestic Lower McCarty 8 Domestic Oakridge 9* Domestic SWTP 10* Domestic Upper 11 Domestic Lower McCarty 12 Domestic Upper McCarty 13 Domestic Deerwood 14 Domestic Oakridge 15 Domestic Kingswood * These patterns were applied to new demands in future year model simulations. For new demands within future year simulations, a diurnal curve was assigned based on the pressure plane location and use. For example, a large apartment in the SWTP plane was assigned a curve for the SWTP pressure plane with a greater than or equal to two-inch diameter. No irrigation demands were specifically identified for future years. 4-4 m:\projects\0600\022-01\doc\report\draft\draftmasterplan-v15_hef.docx