Results The wetted perimeter is Feet. The flow area is Square Feet. The hydraulic radius is Feet. The C value is The flow is CFS. The flow is GPM. The velocity is FPS.

Design Use Values of Manning's n Channel Material n clean, uncoated cast iron 0.013-0.015 clean, coated cast iron 0.012-0.014 dirty, tuberculed cast iron 0.015-0.035 riveted steel 0.015-0.017 lock-bar and welded 0.012-0.013 galvanized iron 0.015-0.017 brass and glass 0.009-0.013 wood stave small diameter 0.011-0.012 large diameter 0.012-0.013 concrete with rough joints 0.016-0.017 dry mix, rough forms 0.015-0.016 wet mix, steel forms 0.012-0.014 very smooth, finished 0.011-0.012 vitrified sewer 0.013-0.015 common-clay drainage tile 0.012-0.014 asbestos 0.011 planed timber 0.011 canvas 0.012 unplaned timber 0.014 brick 0.016 rubble masonry 0.017 smooth earth 0.018 firm gravel 0.023 corrugated metal pipe 0.022 natural channels, good condition 0.025 natural channels with stones and weeds 0.035 very poor natural channels 0.060