Question

Please help me solve this problem.

Bar Screen Grit Chambers Parshall Flume Prople 7 plan The ollowing sa schematic of eimingr treatment Sutem ntown LSA The Systes SrSたS of one bar screen that has bs enings. Ihe bas are aT nale to he horiSontal w i Channe . the Flow s then Split aly benvéen two hori3ontal n elpahy Controlled art Chambers each with g lngt 4 8Aa ft The šingle paishall Flume has q throat wid 2 feet. The average n is 13-5MGo. rs for Pea ctors The Peakino hourly, Deaknolou are and miniMum hou ⑤ The approach velocity to the bar,screen ts not to fall below .fSec during peak hour Foiw Condi honstneaning a eak hourly esigned to have a veloaity o sWhat is the head las throuan the bars at peak hourly oud inches Clean Condihbns)?

Answer 1

From the question Q-13.5MGD Peak hourly discharge-2.80 2..8x13.5 37.8MGD 37.8x10 x0.000015 ft /s 58.49 fis

b) Peakhourly discharge 58.49ft3 /s approach velocity = 3/7/ s Net area of screen opening required- 1" 58.49 -19.51 bars having a width and placed at 1" clear spacing gross area of screen 19.5x(1+.5) placed at 75°gross area of screen- Velocity through screen- approach velocity-3ft /s Head losss through the screen(in m) h = 0.0729(V2-v2-0.0729, 29.25ft2 29.25 sin 75 2.11 / s 30.3fi 3ft/s x1 1/2" (3 -22)1.195j