The following figure shows a plot between shear stress and velocity gradient for materials/fluids P, Q, R, S, and T.
Which one of the following options is CORRECT?
A 2 m wide rectangular channel is carrying a discharge of 30 m3/s at a bed slope of 1 in 300. Assuming the energy correction factor as 1.1 and acceleration due to gravity as 10 m/s2, the critical depth of flow (in meters) is __________ (rounded off to 2 decimal places).
A round-bottom triangular lined canal is to be laid at a slope of 1 in 1500, to carry a discharge of 25 m3/s. The side slopes of the canal cross-section are to be kept at 1.25H : 1V. If Manning’s roughness coefficient is 0.013, the flow depth (in meters) will be in the range of
A hypothetical multimedia filter, consisting of anthracite particles (specific gravity: 1.50), silica sand (specific gravity: 2.60), and ilmenite sand (specific gravity: 4.20), is to be designed for treating water/wastewater. After backwashing, the particles should settle forming three layers: coarse anthracite particles at the top of the bed, silica sand in the middle, and small ilmenite sand particles at the bottom of the bed.
Assume
(i) Slow discrete settling (Stoke’s law is applicable)
(ii) All particles are spherical
(iii) Diameter of silica sand particles is 0.20 mm
The CORRECT option fulfilling the diameter requirements for this filter media is