TABLE 3-7 Design recommendations for a paddle wheel flocculator Parameter G Recommendation <50s¹ Basin Depth Clearance between wheel and walls Wheel Diameter Spacing between wheels on same shaft Spacing between wheel "rims" on adjacent shafts Paddle board Width Length Area of paddles/tank cross section Number per arm 1 m> wheel diameter 0.3-0.7 m 3-4 m 1 m 1 m 10-15 cm 2-3.5 m 0.10-0.25 3 Spacing Tip speed CD L/W=5 Motor Power L/W=20 L/W >> 20 Turn down ratio Sources: Kawamura, 2000; MWH, 2005; Peavy et al., 1985 at 1/3 points on arm 0.15-1 m/s 1.20 1.50 1.90 1.5-2 X water power 1:4