An earthen dam is constructed on an impermeable bedrock layer. it is 123 m across (i. e., the distance from the water in the reservoir to the tailwaters below the dam is 123 m). the average hydraulic conductivity of the material used in the dam construction is 1.33 ml d. the water in the reservoir behind the dam is 18.5 m deep and the tailwaters below the dam are 4.6 m deep. compute the volume of water that seeps from the reservoir, through the dam, and into the tailwaters per 100-m-wide strip of the dam in cubic meters per day. fetter, c. w.. applied hydrogeology (p. 149). waveland press, inc.. kindle edition.

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.