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Storage Reservoirs for Urban Water Supply/Chapter 9

Storage Reservoirs for Urban Water Supply/Chapter 9. SEASONAL RESERVOIR. DISTRIBUTION RESERVOIR. Intake Conduit. Low Lift. High Lift. Conveyance Conduit. Treatment. Distribution. Supply Pipe. WELL FIELD. Peak Inflow. Outflow. Inflow Curve. 0. 1 year. Maximum demand.

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Storage Reservoirs for Urban Water Supply/Chapter 9

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  1. Storage Reservoirs for Urban Water Supply/Chapter 9 SEASONAL RESERVOIR DISTRIBUTION RESERVOIR Intake Conduit Low Lift High Lift Conveyance Conduit Treatment Distribution Supply Pipe WELL FIELD

  2. Peak Inflow Outflow Inflow Curve 0 1 year Maximum demand Pumping flow (Inflow) Demand curve (Outflow) 0 24 hours Storage Function (stabilize flow) seasonal reservoir stabilizing varying seasonal supply distribution reservoir stabilizing a varying demand store release release release store store I>O STORE O>I RELEASE

  3. How much storage capacity needed? Cumulative Net Storage S = cum. net storage (L3) Ot = ODt, volume of reservoir outflow (draft) over Dt (L3) It = IDt, volume of reservoir inflow over Dt (L3)

  4. Illustration of Sequent-Peak method for Seasonal Storage, Linsley et al. 1989 “zero reference”

  5. Reservoir Storage Capacity (cont’d) • Carryover reservoir (Example 9.1) • I = varying river flow over critical period (2-3 yrs) • O = demands and losses • Cannot assume pattern repeats for analysis • Distribution reservoir (Example 9.2) • Operating storage only • I = steady pump flow • O = varying demand from distribution grid over 24 hr critical period • Pumping rate = daily demand/pumping period • Can assume pattern repeats for analysis

  6. Reservoir Storage Capacity (Graphical and Analytical Method)

  7. Reservoir Storage Capacity (cont’d)

  8. Reservoir Storage Capacity (cont’d)

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