Water at 25C is flowing in a covered irrigation ditch below ground. Every 100ft, there is a vent line with a 1.0 in. inside diameter and it is 1.0ft long to the outside atmosphere at 25C. There are 10 vents in the 1000 -ft ditch. The outside air can be as sumed to be dry. Calculate the total evaporation loss of water in lbm/day. Assume that the partial pressure of water vapor at the surface of the water is the vapor pressure, 23.76mmHg at 25C. The diffusivity is 0.26104m2/s