cee5734_week6_2011

cee5734_week6_2011 - Glenn E. Moglen Department of Civil...

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Unformatted text preview: Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Advanced WinTR-20/Detention Basin Modeling CEE 5734 Urban Hydrology and Stormwater Management Week 5 Questions Brief discussion about Homework #3 Today WinTR-20 Review last weeks endpoint Design Sub-Area detention basin Method for making informed iterations Design Overall system detention basin Two-stage riser design Todays Agenda Sub-area 3 Q p increases from 213 ft 3 /s to 483 ft 3 /s Overall system Q p increases from 1150 ft 3 /s to 1432 ft 3 /s. Modeling a sub-divided system Alternate System Output Printed Page File Using TR-55 as guidance, determine storage volume for planned sub-area 3 detention basin (detention basin manages flow in sub-area 3 ONLY). Modeling a sub-divided system Output Detention Basin Modeling q o = 213 ft 3 /s q i = 483 ft 3 /s Determining Needed Storage Volume: NRCS TR-55 Method Objective: Develop separate relationships between: Stage (elevation) and storage (depends on geometry of pool area) Stage and discharge (depends on weir and/or orifice characteristics) Detention Basin Geometry: defining stage-storage-discharge relationship Stage-Storage Relationship Simplest Case Storage (S) = f(h) S = L*w*h L w h Volume stored in basin is a function of depth. ( 29 1 2 + + = i i A A h S Dam 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 2 3 4 5 6 x 10 4 stage (ft) storage (ft 3 ) 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 2 3 4 5 6 x 10 4 stage (ft) storage (ft 3 ) 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 2 3 4 5 6 x 10 4 stage (ft) storage (ft 3 ) 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 2 3 4 5 6 x 10 4 stage (ft) storage (ft 3 ) 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 2 3 4 5 6 x 10 4 stage (ft) storage (ft 3 ) 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 2 3 4 5 6 x 10 4 stage (ft) storage (ft 3 ) Stage-Storage Relationship Topographic Control Case Aerial View of Detention Basin Outlet Structure Detention Basin Boundary Inflow from Hearts Field Dr. Elevation View of Detention Basin Inflow from Hearts Field Dr....
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This note was uploaded on 12/24/2011 for the course CEE 5734 taught by Professor Moglen during the Spring '11 term at Virginia Tech.

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cee5734_week6_2011 - Glenn E. Moglen Department of Civil...

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