1.Lake Mead has a water surface area of 65,800 hectares. In acertain month the reservoir is full, and the pan evaporation rateis 25 cm. Using a pan coefficient of 0.73, estimate the evaporation volume for the month in m 3.
2.The pedestal supports a load P at its center. If the material has a mass density p, determine the radial dimension r as a function of z so that the average normal stress in the pedestal remains constant. The cross section is circular.
3.Lines of levels were run requiring n instrument strips. Therod reading for each backsight and foresight has a standarddeviation σ. What is the standard deviation in the levelline?
n = 40 , σ = ±0.005
OK. This is what I did.
σ = ± 0.005√40 = ±0.032
Is this correct? If not please point in the right direction.