Gujarat Technological UniversitySummer 2026 examination

GTU 3160618 Open Channel flow Summer 2026 Question Paper & PDF

B.E. · Civil Engineering · Semester 6 · Subject code 3160618
Download official PDFView PDF here
Share with your class
Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
No solutions on this paper yetNeed them for your exam? Ask once. Papers that students ask for are solved first, and we aim to add them within 24 hours.

Q.1

14 Marks
(a)
3 marks
Define open channel flow and differentiate between an open channel and a pipe flow.
(b)
4 marks

Define specific energy in an open channel and write its mathematical expression in terms of depth of flow and velocity head.

(c)
7 marks

Describe the typical velocity distribution patterns in various channel sections and explain the factors that influence the velocity coefficients in these channels.

Q.2

14 Marks
(a)
3 marks

List the various types of open channels based on their boundary materials and cross- sectional shape.

(b)
4 marks

Define 'specific force' in open channel flow and mention its primary application in analysing channel transitions.

(c)
7 marks

A trapezoidal channel has a bottom width of 5 m, side slopes of 1.5H:1V, and a bed slope of 0.0008. If the discharge is 15 m³/s, determine the normal depth of flow using the Manning’s equation by an iterative method.

(c)
7 marks

An alluvial channel is to be designed for a discharge of 12 m³/s using Shield’s approach for incipient motion. If the sediment size is 5 mm, estimate the required width and depth of the channel to ensure a non-scouring design.

Q.3

14 Marks
(a)
3 marks

For a trapezoidal channel with a bottom width of 3 m and side slopes of 2H:1V, calculate the wetted perimeter and area when the water depth is 1.2 m.

(b)
4 marks

Given a flow velocity of 0.8 m/s and a hydraulic radius of 0.5 m in a sandy bed channel, calculate the shear velocity and discuss its importance in predicting incipient motion.

(c)
7 marks

Analyze the design criteria for a 'most economical' rectangular channel versus a trapezoidal channel. Justify why the trapezoidal section is frequently preferred in large-scale canal projects.

(a)
3 marks

Discuss how the choice of channel cross-section influences the ease of maintenance and the risk of sediment deposition in an irrigation canal system.

(b)
4 marks
Analyze the classification system of GVF profiles.
(c)
7 marks

Critically judge the design of a hydraulic structure by analyzing its impact on the GVF profile.

Q.4

14 Marks
(a)
3 marks

Analyze the relationship between the channel bed slope and the stability of an alluvial channel.

(b)
4 marks

Critically evaluate the assumptions made in the derivation of the gradually varied flow (GVF) equation.

(c)
7 marks

Critically examine the impact of channel slope and boundary roughness on the evolution of GVF profiles. How would an abrupt change in channel slope from mild to steep create a transition profile?

(a)
3 marks

Critique the use of the 'Manning’s equation' for non-uniform, gradually varied flow profiles.

(b)
4 marks

Critique the use of hydraulic jumps in natural channel systems versus artificial concrete-lined channels.

(c)
7 marks

Evaluate the performance of different types of hydraulic jumps. Based on energy dissipation requirements, justify which type of jump is most suitable for a spillway energy dissipater and why.

Q.5

14 Marks
(a)
3 marks

Design a conceptual layout for a stilling basin that uses a hydraulic jump to protect an erodible downstream bed.

(b)
4 marks

Outline a step-by-step design procedure for a hydraulic jump on a sloping rectangular channel, ensuring the jump remains contained within the apron's structural limits.

(c)
7 marks

A spillway is designed to discharge 40 m³/s per meter width.

1Calculate the depth of flow at the toe of the spillway, assuming a total energy head of 6 m above the crest.
2If the tailwater depth is 4.5 m, evaluate whether a hydraulic jump will form on the spillway apron.
(a)
3 marks

What is meant by the 'celerity' of a small gravity wave, and what primary factors determine its speed?

(b)
4 marks

List and briefly explain four common reasons why unsteady flow might develop in a controlled irrigation canal system.

(c)
7 marks

A spillway discharges water into a rectangular channel at a velocity of 12 m/s with a flow depth of 0.6 m.

1Calculate the Froude number and determine the type of jump.
2Calculate the required sequent depth and the total energy loss in the jump.

Preparing with friends?

Send this paper to your class group. Every question has its own link.

About this paper

Official Gujarat Technological University (GTU) examination paper for Open Channel flow (Summer 2026, B.E. · Civil Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

ViewDownload PDF