CIV E 530 - OPEN-CHANNEL HYDRAULICS SPRING 2008 HOMEWORK No. 13 Design a circular concrete culvert with the following data:   Q = 220 cfs; inlet invert elevation = 100 ft; stream bed slope = 0.02; culvert length = 200 ft; tailwater depth above outlet invert = 4 ft; and roadway shoulder elevation = 112 ft. Assume f = 0.015, Manning's n = 0.013, entrance type is square edge with headwalls, and upstream freeboard = 2 ft. Use ONLINE COLBY to calculate the discharge of sands by the Colby 1964 method given the following flow data:   mean velocity = 4 fps, mean flow depth = 6 ft, channel width = 120 ft, water temperature = 70oF, bed material size = 0.5 mm, and wash load concentration = 300 ppm. Use ONLINE SEDIMENT 51 to calculate the design life of a reservoir, given the following data: reservoir capacity 50 million cubic meters, catchment area 800 km2, mean annual runoff at the site 200 mm. Assume medium grained sediment deposits with specific weight of 1400 kg/m3. Determine how long will it take for the reservoir to lose 20%, 80% and 100% of its storage volume.