A circular settling tank is to be designed for primary treatment of sewage at a flow rate of 10 million liters/day. Assume a detention period of 2.0 hours and surface loading rate of 40000 liters/m²/day. The height (in meters) of the water column in the tank is ______________ (rounded off to 2 decimal places).

An organic waste is represented as C₂₄₀O₂₀₀H₁₈₀N₅S₅.

(Atomic weights: S-32, H-1, C-12, O-16, N-14).

Assume complete conversion of S to SO₂ while burning.

SO₂ generated (in grams) per kg of this waste is __________ (rounded off to 1 decimal place).

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).