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The herbicide 2,4,D, is applied to a golf course at a rate of 1.2 kg/ha. The organic matter content of the soil is 1%, bulk density is 1.3 g/cm3, and water content is 0.3.
(a) What fraction of the herbicide is adsorbed, and what fraction is dissolved?
(b) If the golf course is irrigated at a rate of 1.6 cm/day and the actual grass water use rate is 0.4 cm/day, how long will it take for the 2,4-D to reach the water table at a depth of 2 meters? Assume a constant and uniform soil water content of 0.3.
(c) How much (kg/ha) of the dissolved herbicide will remain when it reaches the water table? Use the decay constant for Ouachita soil and grass.
(d) By how much will the ground water concentration of 2,4-D increase if the herbicide mixes into 2 cm of saturated thickness with a porosity of 0.5?
There are many parallels between the industrialization of the United States after Reconstruction and the modernization of the American workforce in the last twenty to thirty (20-30) years as it transitions from industry to a service-oriented econo..
Starting from x = 0 with no initial velocity, the acceleration of a race car is defined by the relation a = 6.8e-0.00057x, where a and x are expressed in m/s2 and meters, respectively. Determine the position of the race car when v = 30 m/s.
Given s=.30/(60-u), where s is the spacing (space headway) in miles, and u is the speed in miles per hour, derive the relationships u-k, u-q, and q-k. Also, estmate the capacity (qmax) of the roadway.
Base isolation technique has become the method of choice for structural design of buildings and bridges located in highly seismic areas in recent years.
The dye appears 14 days later in an observation well 75 ft away from the injection point. Compute the seepage velocity and estimate the hydraulic gradient in the aquifer if the porosity of the soil is 42%.
in inclined circular gate with water on one side shown in the figure. determine the total resultant force acting on the gate and the total location of center pressure.
Name three types of metamorphic foliations, and draw a small sketch that shows a situation. Where a metamorphic foliation could cause problems in an excavation.
If the elevation difference between the water surfaces is y = 25 + x/11 metres, what minimum pipeline diameter will be required to convey the design discharge? Once your design is complete, determine the actual discharge. The value of x equals 23.
A big municipal utility district is considering two large-scale conduits. The first includes construction of a steel pipeline at a cost of $200 million.
LANDSAT as a spatial resolution of 15m and an altitude of 700km. IKONOS has a spatial resolution of 1m and an altitude of 680km. Calculate the IFOV corresponding to the spatial resolution for sensor.
The calculation and layout of horizontal and vertical curves should be done only by experienced surveyors and differential leveling measurements
Determine the effective size as well as the uniformity coefficient and coefficient of curvature for each soil. Determine also the percentages of gravel, sand, silt, and clay according to (a) ASTM, (b) AASHTO, (c)USCS, and (d) the British Standard.
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