Linear regression

  1. Estimate the head loss for clean racks using (a) Bernoulli’s equation, and (b) Kirschmer’s equation, assuming: -inlet channel = 0.68 m, slope of 0.0001, Manning’s n = 0.012 -average flow = 16,000 m3/day -angle from horizontal = 60° -bar shape = rectangular -bar width = 15 mm -bar spacing = 20 mm -C = 0.7 (for clean racks) Recall: Manning’s equation is: Q= 1R S A2/3 1/2 n where, for a rectangular channel: R= WD , A WD= W D+2 2. Design a system of screw pumps for the following sewer, plant, and flow conditions: Minimum sewage elevation = 112.60 m Maximum sewage elevation = 112.80 m Discharge elevation to plant influent = 116.40 m Average flow at design life = 8600 m3/d Peaking factor for peak hour flow = 2.8 Peaking factor for minimum flow at beginning of design life = 0.49 Provide pump diameter, number of flights, and the number of pumps needed.