Fifty kilograms of toxic material is spilled uniformly across a canal. The canal is trapezoidal with a bottom width of 3 m, side slopes of 2.5:1 (H : V ), and a depth of flow of 1.7 m. The discharge in the canal is 16 m3/s, and the longitudinal diffusion coefficient is 7 m2/s. Cross sectional area = A = by+my^2 = (3m)*(1.7m)+(2.5)*(2.89 m^2) = 12.325 m^2 What length of canal is contaminated 2 hours after the spill?

Darcy concept.

Problem 3. Honey is being pumped through a network of small tubes with inner diamter D = 15 um (Fig. 1). The straight section of the tube has length of L = 5 cm, while the circular section of the tube forms a circle with radius R = 5 cm. 1. Given the viscosity of honey µhoney and assuming the flow splits evenly at the intersections, what is the total pressure drop required to maintain a flow rate Q = 0.5 mL/min as predicted by Poiseuille's law? = 10 Pa-s, density of honey Phoney = 1450 kg/m³, 2. Does the Reynolds number of the flow support the use of Poiseuille's law? R L L Figure 2: Honey is being pumped through a network of small tubes.

Can you help me solve this question please? Thank you Salt lake has no outlet i.e., the inlet flow is completely balanced by evaporation. Lake has a volume of 2.5 x 1011 m3 and the concentration of salt in the lake is 52 g/L. Inlet stream to the lake has a concentration of 0.18 g/L and is flowing at a rate of 3.7 x 109 m3/yr. Lake initially had a concentration of 0.18 g/L and the outflow abruptly stopped, how long ago did that occur?