Lab Report Enb378

ENB378 – Water Engineering

LABORATORY EXPERIENCE WORKSHEET – FLUME A

Group Number: …………………….. Date and time of the laboratory work: ………………………

Name: ……………………………………………………. Student No: ……………………

Name: ……………………………………………………. Student No: ……………………

Name: ……………………………………………………. Student No: ……………………

Name: ……………………………………………………. Student No: ……………………

A team of three/four students are to examine the flow scenarios in two flumes, A and B. The flumes have been arranges to show aspects and the inter-relationships between flow depth, velocity, and energy in rectangular open channels. This worksheet outlines the activities relating to Flume A. Follow the procedure outlined below:

Flume A - Adjustable Bed Flume: Supercritical Flow Over a Hump

i) Sketch the section of the flow that you can see. You should properly represent the variation of water depth in your sketch.

ii) Adjust the hump in the floor of the flume until the bed is horizontal.

iii) Record the channel width and the flow rate. Measure the flow depth in the channel.

iv) Slowly raise the hump using the handle on the front panel beneath the flume.

v) What happening to the flow depth when you are raising the hump height? Explain you observation based on your knowledge of specific energy.

vi) Keep raising the hump while checking the water surface near the top of the hump. The demonstrator will advise you of a safe hump height just before the conditions change. Stop before the upstream depth starts to rise.

vii) Measure the depth upstream, over, and downstream of the hump, and the height of the hump.

viii) Calculate the velocity in the channel upstream of the hump, top of the hump, and downstream.

ix) Calculate the Froude Number upstream downstream and over the hump.

x) Calculate the critical depth for the flow.

xi) Compare the depth over the hump with critical depth. You are required to develop a short discussion on this. Use the...