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iii iiiiiiiiiiiiiiii <br />999 <br />page 5 of 5 <br />West Collection Channel-Facilities Segment <br />(Lower 400' of WPSt Collection Channel) <br />TRAPEZOIDAL CHANNEL <br />CHAN~!FL CAPACITY = 72.39841 CFS <br />*,r*,r**************~*r~+*****+*+*********************+**,r* <br />NOTE -- TRACTIVE FOP.CE = 1,616834 PSF <br />*****,+*******~********,r****+*++******+********+*******~,r+* <br />DESIGN VELOCITY = 7.823416 FPS <br />DESIGN TRACTIVE FORCE = 1.616834 PSF <br />CHANNEL SLOPE = 2.95$ <br />MANNINGS N = .03 <br />DESIGN FLOW DEPTH = 1,237877 FEET <br />DESIGN FREEBOARD = .4 FEET <br />TOTAL CHANIJEL DEPTH = 1,637877 FEET <br />CHANNEL TOP WIDTH = 11.55151 FEET <br />CHANNEL SIDE SLOPE = 2 to 1 <br />DESIGN BOTTOM WIDTH = 5 FEET <br />D50 = 3.5 INCHES <br />Construct surface facilities segment of channel with 5 foot wide bottom by 2 <br />feet deep. Lower 400 feet of surface facilities segment to he lined with <br />durahle sandstone riprap with a minimum D50 of 3.5 inches. The riprap layer <br />will be a minimum of 6 inches thick and will he placed along the channel bank <br />and bottom and worked into the soil with a dozer. Based nn existing gradient <br />and observed performance, riprap lining is not reauirnd for the upper portion <br />of the facilities segment of the channel, <br />7528E <br />scg <br />