cee5734_hw5_2011_solutions

cee5734_hw5_2011_solutions - 1 CEE 5734 – Spring 2011...

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Unformatted text preview: 1 CEE 5734 – Spring 2011 Homework #5 Solutions Problem 1a – From last week’s homework: ft- acre 8 . 5 ) 9167 . ( ) 41 . ( 29 . 33 . 53 s V Problem 1b – From the TR-20 output: Area or Drainage Rain Gage Runoff ------------ Peak Flow ------------ Reach Area ID or Amount Elevation Time Rate Rate Identifier (sq mi) Location (in) (ft) (hr) (cfs) (csm) basin 0.410 Downstream 0.915 8.87 13.20 59.3 144.63 The 59.3 cfs peak discharge is just below the 59.5 cfs pre-development peak discharge, thus the orifice/detention basin combination is controlling the flood. For a stage of 8.87 feet, we can plug this into the spreadsheet used to develop the stage/storage/discharge relationship for the detention basin. A stage of 8.87 feet yields a storage of 5.9 acre-feet. This compares very well with the 5.8 acre-feet found in Problem 1a. Problem 1c – see handwritten notes The spreadsheet used to develop the stage/storage/discharge relationship resulted in an optimized orifice area (horizontally-mounted orifice) of 4.7 ft 2 . Problem 1d Input file appears below: WinTR-20: Version 1.11 0 0 0 Homework: Week 4: Problem 1 SUB-AREA: Area 1 basin 0.41 80. 1.0 Area 2 Reach 4 0.95 71.6 1.6 1....
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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_hw5_2011_solutions - 1 CEE 5734 – Spring 2011...

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