3) You are assigned to determine the Manning's n coefficient for sagebrush. In eastern Oregon where sagebrush grows, you construct a long trapezoidal channel with a bottom width of 10 feet, 1:1 side slopes, and a 0.001 longitudinal slope. You plant sagebrush on the bottom of the channel. For a uniform flow of 13 cfs the water depth is 1 foot. What is Manning's n? Your result is dependent on several choices you made in setting up the experiment, list two independent ones. If you were to change these, the value you calculate would change. lo ft

3) You are assigned to determine the Manning's n coefficient for sagebrush. In eastern Oregon where sagebrush grows, you construct a long trapezoidal channel with a bottom width of 10 feet, 1:1 side slopes, and a 0.001 longitudinal slope. You plant sagebrush on the bottom of the channel. For a uniform flow of 13 cfs the water depth is 1 foot. What is Manning's n? Your result is dependent on several choices you made in setting up the experiment, list two independent ones. If you were to change these, the value you calculate would change. lo ft

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.14P

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a water resource engineer is in charge of designing atrapezoidal open channel for flood control. Typically, these types of channels are made ofconcrete. Use Manning’s Equation.Flowrate (Qb), channel slope (S0), bottom width (Bw), channel sidewall angle (θ), actual depth(y), and Manning’s coefficient (n) are tabulated below. State all assumptions. * z is the sidewall ratio: for every 1 unit increase in depth, the top width increases by z on eachside of the channel, or 2z total.A) Given the actual depth, y = 1.25 ft, find the discharge Qa.B) Find the Critical Depth, yc, for the discharge Qa found in (a). For a trapezoid,dA/dy =Bw +2 yz .Is the flow sub- or super-critical?C) Determine the uniform flow normal depth (yn) at Qb = 209 cfs.D) If the slope is increased to 0.001, what roughness coefficient would be needed tomaintain the same discharge Qa? What about for Qb? Would it be the same value?
Use the Clark unit hydrograph procedure to compute and plot the 3-hr unit hydrograph for a watershed that has an area of 1,100 km^2 and a time of concentration of 5 hr. The Clark storage coefficient is estimated to be 4 hr. Use a 1-hr time interval for the computations and apply the U.S. Army Corps of Engineers synthetic time-area relationship. Extend the unit hydrograph to t = 25 hr to capture the recession limb.
A wide, clean-earth river has a flow rate q = 150 ft3/(s . ft).What is the critical depth? If the actual depth is 12 ft, whatis the Froude number of the river? Compute the criticalslope by (a) Manning’s formula and (b) the Moody chart.
C is roughness coefficient. Hazen Williams Formula: H?=10.67??^1.85/?^1.85?^4.87
Given Y = 10 kn/m^3 Find Fh, Fv, horizontal distance of Fv from A
Given the following data of a stream of uniform flow: h b h=height of water = 1.20m b= with of bottom = 3.30m water surface tength of stream =120.70m elevation = 220.34m elevation = 221.31m A = cross sectional area, sq m P = wetted perimeter, m S =slope of stream bed, decimal n = 0.025 (roughness coefficient ) Determine the following: a) Hydraulic radius b) Average velocity of stream using Manning's coefficient and the corresponding discharge c) Average velocity of stream using Kutter's coefficient , and the corresponding discharge
Given is the cross-section of a stream with uniform flow having a slope of 0.007 and the roughness coefficient of the stream bed is 0.025. Determine: 1. a. Hydraulic radius b. Average velocity of the stream using Manning's coefficient and the corresponding discharge c. Average velocity of the stream using Kutter's coefficient and the corresponding discharge. 5.5 m 6.0 m 6.0 m 6.0 m 5.5 m 2.0 2.7 2.4 1.2
By Lacey's only or else skip proper explanation
If the mean bed particle size of a normal stream is 1.8 mm, then the Manning's roughness coefficient, n, based on the Strickler's formula is: Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b 0.043 d 0.0137 с 0.117 0.0117
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10 In a channel of rectangular cross section with a slope of 1 in 1000, the discharge is to be 1,4 m³/s when the channel is running full. Its depth is half as its breadth. If the channel is roughly excavated, the coefficient of discharge C is 27 in SI units, and the Chezy formula is V = C √(Rs). If the bottom and side slopes are finished smoothly, C = 81 (R = hydraulic radius, s = slope) Assuming the cost of excavation /m³ is twice the cost of smooth finishing /m² Compare the costs of the two types of channels.