Our worldAges 13-15

River cross-section & discharge

Use Q = A × v to calculate river discharge in m³/s from cross-sectional area and flow velocity. Review suitability for your learners before teaching.

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Age band:Ages 10-12 Ages 13-15

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Worksheet StudioPractice pack · Ages 13-15

River cross-section & discharge

Take your time. Show your thinking.

1. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
3 m · 8 m/s · River cross-section & disc…
2. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
9 m · 8 m/s · River cross-section & disc…
3. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
9 m · 6 m/s · River cross-section & disc…
4. A river channel has a wet cross-sectional area of 6 m² and an average flow velocity of 4 m/s. Use Q = A × v to calculate its discharge.
6 m · 4 m/s · River cross-section & disc…
5. A river channel has a wet cross-sectional area of 21 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
21 m · 6 m/s · River cross-section & disc…
6. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 2 m/s. Use Q = A × v to calculate its discharge.
3 m · 2 m/s · River cross-section & disc…
7. A river channel has a wet cross-sectional area of 18 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
18 m · 6 m/s · River cross-section & disc…
8. A river channel has a wet cross-sectional area of 25 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
25 m · 6 m/s · River cross-section & disc…
9. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 1 m/s. Use Q = A × v to calculate its discharge.
14 m · 1 m/s · River cross-section & disc…
10. A river channel has a wet cross-sectional area of 11 m² and an average flow velocity of 7 m/s. Use Q = A × v to calculate its discharge.
11 m · 7 m/s · River cross-section & disc…
11. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 3 m/s. Use Q = A × v to calculate its discharge.
14 m · 3 m/s · River cross-section & disc…
12. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
3 m · 6 m/s · River cross-section & disc…

12 questions · Seed 43 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 13-15

River cross-section & discharge

Answers and reasoning. Review before teaching.

1. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
24 m³/s
Discharge Q = cross-sectional area × velocity = 3 m² × 8 m/s = 24 m³/s.
2. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
72 m³/s
Discharge Q = cross-sectional area × velocity = 9 m² × 8 m/s = 72 m³/s.
3. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
54 m³/s
Discharge Q = cross-sectional area × velocity = 9 m² × 6 m/s = 54 m³/s.
4. A river channel has a wet cross-sectional area of 6 m² and an average flow velocity of 4 m/s. Use Q = A × v to calculate its discharge.
24 m³/s
Discharge Q = cross-sectional area × velocity = 6 m² × 4 m/s = 24 m³/s.
5. A river channel has a wet cross-sectional area of 21 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
126 m³/s
Discharge Q = cross-sectional area × velocity = 21 m² × 6 m/s = 126 m³/s.
6. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 2 m/s. Use Q = A × v to calculate its discharge.
6 m³/s
Discharge Q = cross-sectional area × velocity = 3 m² × 2 m/s = 6 m³/s.
7. A river channel has a wet cross-sectional area of 18 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
108 m³/s
Discharge Q = cross-sectional area × velocity = 18 m² × 6 m/s = 108 m³/s.
8. A river channel has a wet cross-sectional area of 25 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
150 m³/s
Discharge Q = cross-sectional area × velocity = 25 m² × 6 m/s = 150 m³/s.
9. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 1 m/s. Use Q = A × v to calculate its discharge.
14 m³/s
Discharge Q = cross-sectional area × velocity = 14 m² × 1 m/s = 14 m³/s.
10. A river channel has a wet cross-sectional area of 11 m² and an average flow velocity of 7 m/s. Use Q = A × v to calculate its discharge.
77 m³/s
Discharge Q = cross-sectional area × velocity = 11 m² × 7 m/s = 77 m³/s.
11. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 3 m/s. Use Q = A × v to calculate its discharge.
42 m³/s
Discharge Q = cross-sectional area × velocity = 14 m² × 3 m/s = 42 m³/s.
12. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
18 m³/s
Discharge Q = cross-sectional area × velocity = 3 m² × 6 m/s = 18 m³/s.

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

River cross-section & discharge

Take your time. Show your thinking.

1. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
3 m · 8 m/s · River cross-section & disc…
2. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
9 m · 8 m/s · River cross-section & disc…
3. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
9 m · 6 m/s · River cross-section & disc…
4. A river channel has a wet cross-sectional area of 6 m² and an average flow velocity of 4 m/s. Use Q = A × v to calculate its discharge.
6 m · 4 m/s · River cross-section & disc…
5. A river channel has a wet cross-sectional area of 21 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
21 m · 6 m/s · River cross-section & disc…
6. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 2 m/s. Use Q = A × v to calculate its discharge.
3 m · 2 m/s · River cross-section & disc…
7. A river channel has a wet cross-sectional area of 18 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
18 m · 6 m/s · River cross-section & disc…
8. A river channel has a wet cross-sectional area of 25 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
25 m · 6 m/s · River cross-section & disc…
9. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 1 m/s. Use Q = A × v to calculate its discharge.
14 m · 1 m/s · River cross-section & disc…
10. A river channel has a wet cross-sectional area of 11 m² and an average flow velocity of 7 m/s. Use Q = A × v to calculate its discharge.
11 m · 7 m/s · River cross-section & disc…
11. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 3 m/s. Use Q = A × v to calculate its discharge.
14 m · 3 m/s · River cross-section & disc…
12. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
3 m · 6 m/s · River cross-section & disc…

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

River cross-section & discharge

Answers and reasoning. Review before teaching.

1. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
24 m³/s
Discharge Q = cross-sectional area × velocity = 3 m² × 8 m/s = 24 m³/s.
2. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 8 m/s. Use Q = A × v to calculate its discharge.
72 m³/s
Discharge Q = cross-sectional area × velocity = 9 m² × 8 m/s = 72 m³/s.
3. A river channel has a wet cross-sectional area of 9 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
54 m³/s
Discharge Q = cross-sectional area × velocity = 9 m² × 6 m/s = 54 m³/s.
4. A river channel has a wet cross-sectional area of 6 m² and an average flow velocity of 4 m/s. Use Q = A × v to calculate its discharge.
24 m³/s
Discharge Q = cross-sectional area × velocity = 6 m² × 4 m/s = 24 m³/s.
5. A river channel has a wet cross-sectional area of 21 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
126 m³/s
Discharge Q = cross-sectional area × velocity = 21 m² × 6 m/s = 126 m³/s.
6. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 2 m/s. Use Q = A × v to calculate its discharge.
6 m³/s
Discharge Q = cross-sectional area × velocity = 3 m² × 2 m/s = 6 m³/s.
7. A river channel has a wet cross-sectional area of 18 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
108 m³/s
Discharge Q = cross-sectional area × velocity = 18 m² × 6 m/s = 108 m³/s.
8. A river channel has a wet cross-sectional area of 25 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
150 m³/s
Discharge Q = cross-sectional area × velocity = 25 m² × 6 m/s = 150 m³/s.
9. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 1 m/s. Use Q = A × v to calculate its discharge.
14 m³/s
Discharge Q = cross-sectional area × velocity = 14 m² × 1 m/s = 14 m³/s.
10. A river channel has a wet cross-sectional area of 11 m² and an average flow velocity of 7 m/s. Use Q = A × v to calculate its discharge.
77 m³/s
Discharge Q = cross-sectional area × velocity = 11 m² × 7 m/s = 77 m³/s.
11. A river channel has a wet cross-sectional area of 14 m² and an average flow velocity of 3 m/s. Use Q = A × v to calculate its discharge.
42 m³/s
Discharge Q = cross-sectional area × velocity = 14 m² × 3 m/s = 42 m³/s.
12. A river channel has a wet cross-sectional area of 3 m² and an average flow velocity of 6 m/s. Use Q = A × v to calculate its discharge.
18 m³/s
Discharge Q = cross-sectional area × velocity = 3 m² × 6 m/s = 18 m³/s.

12 questions · Seed 43 · Age guidance, not curriculum certification