duke university water reclamation pond
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Duke UniversityWater Reclamation Pond
Water Resources Research Institute
March 18, 2015
James Caldwell, PE
1. Stormwater at Duke2. 2007 Drought/ Feasibility Study3. Duke Chilled Water System4. Continuous Modeling5. Permitting6. Construction/ Schedule
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Duke Master SIA2/10 Year Detention @ Property/ROW1-Year Detention @ Streams
2007 Droughto “100 – Year Drought”o Duke University is the largest user of potable
water in City of Durhamo FY06 = 645 MG/Yr.o FY07 = 614 MG/Yr.
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2008 Feasibility Study• 8 Sites to…• 4 Sites to…• 2 Sites to…• 1 Site
Size Use Capacity Yield
Where is most demand and most runoff?
Chiller Plant #2• Drainage Area = 265
acres• Impervious = 137 acres• Baseflow = 0.3 cfs
Duke Chilled Water System• 14 miles of CW lines on campus• 2 Chiller Plants• Cycle load between plants• Chiller Plant #2 can use up to 1MGD• Hospital/Research buildings are “outside air”• Up to 100K gallons a day in condensate
reclaim• Chiller Plant #2 is 64,000 square feet• All system redundant except water
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Continuous Modeling
Goal is to Model Yield/Volume Removal, based on historic rainfall, not theoretical storms
IN = Runoff, Baseflow
OUT = CP#2 Demand, Minimum Release, Evaporation, Infiltration
Used HEC-HMS for Modeling (Deficit- Constant Loss Model)
4’ Flux (309 to 313)
Mhs model pic
Yield/Results
143,600,000 Gallons to CP#2
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4’ Flux (309-313) Flux Volume = 900,000 cf 1” Storm = 500,000 cf Area = 5.15 Acres (EL 311) Planting Zones Valves at 309,311 Under Normal Pool Volume =
1,600,000 cf Total Volume = 4,300,000 cf Reduction in 1-Year Storm Peak
= 64%
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Permitting Agencies (20 permits…)
US Army Corps of Engineers
NC DWQ NC Dam Safety Durham County City of Durham Duke University
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Questions?
James Caldwell, PEMcAdams Water Resources & Infrastructure
(919) [email protected]