Lab 7 - Open Channel Weirs

Question 1

What is an open channel

Answer 1

when the water surface is exposed to the atmosphere

Question 2

What are hydraulic structures used for?

Answer 2

regulate, measure, and/or transport water in open channels.

Question 3

When are hydraulic structures labeled as control structures?

Answer 3

if there is a fixed relationship between the flowrate through the structure and the water-surface elevation upstream or downstream of the structure.

Question 4

Three categories of hydraulic structures may be grouped in

Answer 4

(1) flow-measuring structures, such as weirs; (2) regulation structures, such as gates and stilling basins; and (3) discharge structures, such as culverts.

Question 5

How is the relationship between the upstream water surface elevation and the flowrate over the weir calibrated?

Answer 5

the discharge coefficients to account for losses

Question 6

What is the purpose of the open channel weir experiment?

Answer 6

determine a coefficient of discharge for the weir and to compare it to the one predicted by the Rehbock formula. And to compare the experimental and theoretical flow rates calculated using two different equations.

Question 7

What is the apparatus for this experiment?

Answer 7

Armfield 56-MKII

Question 8

what does y=mx +b correspond to in this experiment

Answer 8

log(Q) = mlog(ho) +log(K)

Ex. y= 1.4608x - .2572, so m=1.4608 and K = 10^(-.2572)=.533