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A 10 ha site is scheduled for re-development into a low density residential housing estate. The area is currently turfed. Soil tests on samples reveal that the soil on average contains 25% clay, 10% silt, the rest, sand and 0.5% organic matter. The flow length is estimated to be 200m with an average slope of 2.5%. Erosion control practice limits erosion from 30% of the surface area only (ie no erosion occurs from 70% of the surface), and erodible areas are well compacted. Assuming that the specific energy proposed by Wischmeier and Smith (1974) is applicable, for the construction phase:
(i) Plot the pollutograph of solids runoff from the site and estimate the maximum solids concentration (g/L) for runoff from the site.
(ii) Estimate total mass of solids (kg) mobilised from the site during and after construction for the same storm event
An electron moves through a uniform magnetic field given by =Bx i +(2.40 Bx) j . At a particular instant, the electron has velocity =(1.92 i +4.61 j ) m/s and the magnetic force acting on it is (3.08 X 10-19 N) k. Find Bx.
A violin string which is 30.4 cm long is tuned so that its pitch isconcert A which is 440Hz. I can effectively shorten the string byplacing my finger on it and pressing it down.
A simple microscope is formed by placing an object 40cm away from an f=20cm objective lens, which is placed 50cm from the f=10cm eyepiece lens. Will the image observed be right way up (same orientation as the object), inside out or upside down?
The fundamental frequency of a pipe that is open at both ends is 560 hz . a) How long is this pipe? Use v = 344m/s . b) If one end is now closed, find the wavelength of the new fundamental. c) If one end is now closed, find the frequency of the new f..
A complete series circuit consists of a 12.5V battery, a 3.70ohm resistor, and a switch. What does an ideal voltmeter read when placed across the terminals of the battery
imagine that you have a gas confined in an insulated cylinder by a piston. imagine that you suddenly push hard on the
A sphere of radius r starts from rest and rolls without slipping along a curved surface, Find the final speed v of the sphere's center of mass
A cubical box with sides of length a#consists of five metal plates which are welded together and grounded, Find the potential everywhere inside the box
A train sounds its whistle as it approaches and leaves a railroad crossing. An observer at the crossing gauges a frequency of 219 Hz as the train approaches and a frequency of 184 Hz as the train leaves. The speed of sound is 340 m/s. Discover the sp..
A container is filled to the brim with 1.6 L of mercury at 20°C. As the temperature of the container and mercury is increased to 49°C, compute the linear expansion coefficient of the material
What is the change in internal energy of a system that takes in 2.80 x 106 J of heat, and does 4.50 x 105 J of work while dissipating 6.00 x 106 J of heat
question1a 0.145-kg baseball pitched horizontally at 39 ms strikes bat and is popped straight up to a height of 32 m.
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