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Chlorophenols impart unpleasant taste and odor to drinking water at con-centrations as low as 5 mg/m3. They are formed when the chlorine disin-fection process is applied to phenol-containing waters. What is the unpleasant taste and odor threshold in units of
(a) mg/L,
(b) tg/L,
(c) ppm,
(d) ppb?
A scuba divers 2 cubic foot air tank is to be filled with air from a compressed air line at 120 psia and 100 degrees F. Initially the air in this tank is at 20 psia and 70 degrees F.
If a specimen spends 70% of its life subject to alternating stress levels equal to its fatigue endurance limit σe, 20% at l.lσe estimate its fatigue life using the Palmgren-Miner linear damage rule.
If a plus sight of 3.54 ft is taken on BM A, elevation 850.48 ft, and a minus sight of 7.84 ft is read on point X, calculate the HI and the elevation of point X.
The sports car has a mass of 2.3 Mg and accelerates. at 6m=s2, starting from rest. If the drag resistance on the car. due to the wind is F D = (10v) N, where v is the velocity in m/s,
Piezometer A is located 3000 feet due south of piezometer B. Piezometer C is located 2000 feet due west of piezometer B. The surface elevations of A, B and C are 480, 610 and 545 feet respectively. The depth to water in A is 40 feet, in B is 140 f..
You are required to design a drainage and pumping system to deal with the mine water for the next 10-15 years based on the data in the following sections.
If the component of velocity along the axis is Vx=6t with t in seconds. determine the particle's distance from the oriigin which is at t=3s. when t=0, x=0, and y=0. also determine the magnitude of acceleration when t=3, x and y are in ft.
Problems that may occur for the owner during the bidding phase of a project when the estimated pay quantities in a unit-price contract are lower than the actual amount.
Water leaves a reservoir at 0.05 m^3/s through a 200-mm riveted steel pipeline that protrudes into the reservoir and then immediately turns a 90º bend with a local (minor) loss coefficient equal to 0.3.
The mean annual precipitation for a 325 mi2 watershed is25 inches. Assume that 20% of the annual precipitation reachesthe watershed outlet as streamflow. Determine the meanstreamflow rate in ac-ft/yr
if the settling velocity of a particle is 2.8 mm/s and the overflow rate of an upflow clarifier is .56 cm/s what percent of the particles are retained in the clarifier
A 5-ha residential development with 0.4-ha lots is to be drained such that the first 25mm of runoff is retained onsite and the postdevelopment peak discharge rate from the site is not to exceed 1m^3/s for thje 25-year 1-d rain event. The natural soil..
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