Assuming that the specific gravity of the following substances is approximately the same, that is, 2.65, and that the water is at 20°C, calculate the time it will take to settle 1m of the following materials: a) Gravel (Dp=10,000 μm) in seconds I want help with this one, I did the problem but the time gave me 36.36 seconds and the Dr told me that the result is incorrect, I would like to know how to do it. I used the formula of V=Dp^2(g)(△p) / 18μ ; Then use a substitution to calculate the time which would be t=h/v

1. You stumble and break your leg after falling into a deep pot hole. While waiting for your leg to heal, you decide to fill in the pot hole with some gravel so no one else gets hurt. You go to the garden store to buy gravel but no one has heard of the USCS system. That does not matter since they only have one type anyway. You buy a bag and run a sieve test on a 470g sample that produces the following data. Plot the grain size distribution curve, identify the coefficients of curvature and uniformity, and classify according to USCS. Explain why either a poorly graded gravel or a well graded gravel would be better for this application (hint: think about the voids). Sieve size (mm) Mass retained (g) 63 0 26 37.5 19 28 13.2 18 9.5 6.7 4.75 2.36 1.18 0.6 0.212 0.075 20 49 50 137 46 31 34 30