For a given year, a 378-acre lake has 22cfs of inflow, 19cfs of outflow, and a totalstorage increase of 13ac-ft. A USGS gage next to the lake recorded a total of 3.5 inprecipitation for the lake on the first month and 2.9 in on the second month. If theinfiltration loss is considered insignificant for the lake, determine the following:i Evaporation loss, in inches, over the lake for two months.ii Compute the transpiration, in inches, if it is the 9% of the evaporation loss.iii If the inflow and outflow are the same, compute the new evaporation loss/gain,in inches, over the lake for two months.

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Answered: For a given year, a 378-acre lake has…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Please be clear with your solution and write an explanation for every formula and solution. 1. For a given month a 300-acre lake has 15 cfs of inflow, 13 cfs of outflow, and a total storage increase of 16 ac-ft. A USGS gage next to the lake recorded a total of 1.3 in. precipitation for the lake for the month. Assuming that infiltration loss is insignificant for the lake, determine the evaporation loss, in inches, over the lake for the month.
A lake with a surface area of 525 acres was monitored over a period of time. During a one-month period, the inflow was 30 cfs, the outflow was 27 cfs, and a 1.5-in seepage loss was measured. During the same month, the total precipitation was 4.25 in. Evaporation loss was estimated as 6.0 in, a) Estimate the change in storage for the lake during the month in inches. b) What should be the outflow to produce an opposite change in storage from the computed magnitude in (a), considering that there are no changes in the other parameters?
Estimate the amount of rain storage (in inches) in a 6-acre parking lot using the following rainfall and runoff data for one hour period. Rainfall = 0.48 inches, evaporation = 0.31, rainfall excess = 6 ft3/s measured at the outlet of the parking lot.
- For a given month, a 121 ha lake has 0.43 m³/s of inflow, 0.37 m'is of outflow, and the total storage increase of 1.97 ha-m. A rain gauge station next to the lake recorded a total of 3.3 cm precipitation for the lake for the month. Assuming that infiltration loss is insignificant for the lake, determine the evaporation loss, in cm over the lake for the month.
The initial infiltration capacity fo of a watershed is estimated as 1.5 in./hr,and the time constant is taken to be 0.35 hr -1. The equilibrium capacity fe is 0.2 in./hr. Use Horton's equation to find (a) the values of fat t= 10 min, 30 min, 1 hr, 2 hr, and 6 hr, and (b) the total volume of infiltration over the 6-hr period
IQ4// [A]: For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and declined exponentially to a constant rate of 8 mm/hr after 2.5 hr. The total infiltration during 2.5 hr was 50 mm. Develop the Horton's equation for the infiltration rate at any time t<2.5 hr. [B]: Find the required discharge of irrigation water at the headwork of the distiriburatry, if the gross area is 20000 mishara, the irrigation intensity is 65%, and the water duty is 1600 hectare/m/sec.
A 100-year storm occurs in Northern Nevada. You wish to find the precipitation and infiltration rate that occurs at the local duck pond over the course of the 1-day storm. In the city records, the area of the duck pond is 10 ft2. The local parks department reports that the evaporation for the pond was 48 inches and the runoff from the pond is 3 feet. The reported change in storage was found to be 0.5 feet. Draw the duck pond system and label each of the elements used in the balance. Find the precipitation (ft) that occurred during the 1-day storm. Determine the infiltration rate (ft/hr.) over the duration of the 1-day storm.
Problem 2 A watershed having an area of 28 km² records the following rainfall data. Time Rainfall Time Rainfall (mm) 0.6 (mins) 150 180 210 (mins) 30 (mm) 3.4 60 1.1 2.2 90 1.7 1.3 120 2.5 240 0.2 Determine the infiltration rate (in mm/hr) using the o-index method if the runoff volume was found to be 224,000 m³.
A catchment soil has a Horton infiltration parameter: f0=240 mm/hr, fc=30 mm/hr and k=0.2 min^-1. Calculate the infiltration rate right after two hours. Assuming a rain of constant intensity of 50 mm/hr occurs and lasts fo 3 hours, calculate the amount of rain that infiltrates into the soil.
Exercise [1] For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and decreased exponentially to a constant rate of 8 mm/hr after 2.5 hr. The total infiltration during 2.5 hr was 50 mm. Develop the Horton's equation for the infiltration rate at any time t < 2.5 hr.
Q#3: The following are the monthly evaporation data in cm in a certain year (Jan.-Dec.) in the vicinity of a lake: 18.7 16.1 19.9 27.0 29.5 24.4 19.7 19.2 20.2 22.5 18.7 17.4 The water spread area in the lake in the beginning of January was (98) square kilometer and at the end of December was (97.6) square kilometer. Calculate the loss of water in million cubic meter due to evaporation in that year.
The precipitation in October is 2.5 inches in a 1400 mi² watershed. The ET rate is 0.8 inch/mo. A river flows out of the watershed at 1000 cfs. What is the groundwater recharge rate for the month of October (ft3/mo)? Assume no groundwater exfiltration or other surface flows. What are some assumptions you should make for this problem? What is precipitation in units of ft³/mo? What is ET in ft3/mo? What is the river flow in ft³/mo? What is the groundwater recharge rate in October in ft3/mo?

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