Problem 9.12 The following mean daily temperatures were recorded near a watershed that is 70% open and 30% forested: 37, 42, 29, 35, 41, 39, and 44°F. Use Equation 9.10 to estimate the total melt for the week.

Problem 2: During a 60-minute storm, the precipitation rate over a 90-acre area is 0.9 in/hr. An infiltration rate of 0.12 in/hr is assessed for the period of the storm. The average river outflow from the arca is 40 cfs during the storm. What is the value of combined depression and interception storages in acre-ft, cubic ft, and cfs-hour.

Use the rainfall data provided in Problem 4.4 and the watershed map we used in class last Friday to find the watershed -wide mean precipitation using the arithmetic mean and repeat using the isohyetal method.

Find the equivalent K value for the system shown below, where K₁ = 20 m/day, K₂ = 33 m/day, K₂ = 38 m/day, K₁=25 m/day, K, = 30 m/day, b = 22 cm, b₂ = 35 cm, b, = 42 cm, b = 33 cm, b, = 28 cm and b, = 45 cm.

Find the hydraulic conductivity of the soil sample shown below. The porosity of the soil sample is 0.31. The piczometers readings are ₁ = 20 cm and ₁=28 cm. The discharge is 0.55 liters/day and Ax= 65 cm. The soil sample is contained in a tube of 15-cm diameter, where 0 = 42 degrees. Find the time it takes for a water particle to travel the length of the sample.

The intrinsic permeability of a soil sample is 3.5x10f². What is the water discharge per unit width, in cubic ft per day, through a confined aquifer of similar soil properties for hydraulic head difference of 0.51 ft over a length of 750 ft? The water temperature through the soil is 50°F and the porosity of the soil is 0.30. The average depth of the aquifer is 35 ft. Also, find the time in days the water will take to move 500 ft.

Below a discharge from a wastewater treatment plant, an 8.6-km stream has are oxygenation constant of 0.4 day', a velocity of 0.15 m/s, a dissolved oxygen concentration of 6 mg/L, and an ultimate oxygen demand (L) of 25 mg/L. The stream is at 15°C. The deoxygenation constant is estimated at 0.25 day'. a. Will there be fish in this stream? b. Why should we care if there are fish in the stream? Do the fish deserve moral consideration and protection? What arguments can you muster to support this view?

For a flow rate of 212 cfs find the critical depth in (a) a rectangular channel with b = 6.5 ft,(b) a triangular channel with m = 1.6 ft, (c) a trapezoidal channel with b = 6.5 ft and m =5.0 ft, (d) a circular channel with d = 6.5 ft.

5. An inverted test tube partially filled with air floats in a plastic water-filled soft drink bottle asshown in below. The amount of air in the tube has been adjusted so that it just floats. The bottlecap is securely fastened. A slight squeezing of the plastic bottle will cause the test tube to sink tothe bottom of the bottle, Explain this phenomenon.

Question 2 (30 points): The hydrologic flow path of the watershed is about 2,000 feet in length with a total elevation change of about 20 feet. This flow path may be divided into the following three segments as described below. The site has overland flow, shallow channel flow, and main channel flow The 2 year 24-hour rain event is 3.5 inches. The main channel is rectangular.Compute the water shed's total time of concentration. A: Determine the overland flow travel time : Determine the shallow channel travel time. Part C: Determine the Main Channel travel time. Assume the channel is rectangular and with a width of 15 feet and a depth of 2 feet. Part D: Determine the time of concentration.