A stream carrying sediment with a representative diameter of 0.2 mm is carried in a channel with a depth of 1.25 m, a length of 40 m, and a flow velocity of 0.5 m/s. If a mineral sediment particle is at the water surface when it enters the channel, will the particle still be in suspension in the water column at the end of the channel, or will it settle onto the bottom before the channel ends? Check to make sure you meet the Reynolds Number < 1.0 requirement.

A water treatment plant processes 21,000 cubic meters of water per day. Assume two types of flocculated particles enter the basin. You are asked to evaluate the performance of a rectangular sedimentation basin that has dimensions of depth=4 m, width= 6 m, and length= 40 m. The first type of particles has a settling velocity of 0.5 m/hr and the other type has a settling velocity of 1.8 m/hr. What percent of particles are removed for each of the two types of particles?

Find the total amount of suspended sediment per unit width of a river according to the velocity profile and suspended sediment concentration given in the following table. Depth (m) 0.05 0.5 1.0 1.5 2.0 2.2 1.53 1.73 1.41 0.71 Velocity (m/s) Concentration(m³/10ʻm³) 1.21 0.31 111 113 211 313 411 611

Please answer all 1. List the three corrections which should be applied to the hydrometer readings.  2. Why is it important to remove the hydrometer from the measuring cylinder between readings? 3. A hydrometer test has the following results; Gs = 2.70, temperature = 240C, and L = 92 mm at 60 minutes after the start of sedimentation. Calculate the diameter of the smallest-size particles that have settled beyond the zone of measurement at that time (use the table in the lab manual to find, A=0.0128). D(mm) = A sqrt( L(cm) / t(min) )