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Storm hydrograph lag time

Calculate storm hydrograph lag time in hours between peak precipitation and peak river discharge. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 16-18

Storm hydrograph lag time

Take your time. Show your thinking.

1. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 18:00 on the same day. What is the basin lag time in hours?
07 · 00 · 18 · 00 · Storm hydrograph lag time
2. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 11:00 on the same day. What is the basin lag time in hours?
07 · 00 · 11 · 00 · Storm hydrograph lag time
3. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 08:00 on the same day. What is the basin lag time in hours?
03 · 00 · 08 · 00 · Storm hydrograph lag time
4. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 12:00 on the same day. What is the basin lag time in hours?
03 · 00 · 12 · 00 · Storm hydrograph lag time
5. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 07:00 on the same day. What is the basin lag time in hours?
02 · 00 · 07 · 00 · Storm hydrograph lag time
6. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 21:00 on the same day. What is the basin lag time in hours?
10 · 00 · 21 · 00 · Storm hydrograph lag time
7. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 09:00 on the same day. What is the basin lag time in hours?
02 · 00 · 09 · 00 · Storm hydrograph lag time
8. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 16:00 on the same day. What is the basin lag time in hours?
09 · 00 · 16 · 00 · Storm hydrograph lag time
9. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
02 · 00 · 06 · 00 · Storm hydrograph lag time
10. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 20:00 on the same day. What is the basin lag time in hours?
09 · 00 · 20 · 00 · Storm hydrograph lag time
11. On a storm hydrograph, peak rainfall occurs at 04:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
04 · 00 · 06 · 00 · Storm hydrograph lag time
12. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 14:00 on the same day. What is the basin lag time in hours?
10 · 00 · 14 · 00 · Storm hydrograph lag time

12 questions · Seed 44 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 16-18

Storm hydrograph lag time

Answers and reasoning. Review before teaching.

1. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 18:00 on the same day. What is the basin lag time in hours?
11 hours
Lag time = time of peak discharge − time of peak rainfall = 18 − 7 = 11 hours.
2. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 11:00 on the same day. What is the basin lag time in hours?
4 hours
Lag time = time of peak discharge − time of peak rainfall = 11 − 7 = 4 hours.
3. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 08:00 on the same day. What is the basin lag time in hours?
5 hours
Lag time = time of peak discharge − time of peak rainfall = 8 − 3 = 5 hours.
4. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 12:00 on the same day. What is the basin lag time in hours?
9 hours
Lag time = time of peak discharge − time of peak rainfall = 12 − 3 = 9 hours.
5. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 07:00 on the same day. What is the basin lag time in hours?
5 hours
Lag time = time of peak discharge − time of peak rainfall = 7 − 2 = 5 hours.
6. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 21:00 on the same day. What is the basin lag time in hours?
11 hours
Lag time = time of peak discharge − time of peak rainfall = 21 − 10 = 11 hours.
7. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 09:00 on the same day. What is the basin lag time in hours?
7 hours
Lag time = time of peak discharge − time of peak rainfall = 9 − 2 = 7 hours.
8. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 16:00 on the same day. What is the basin lag time in hours?
7 hours
Lag time = time of peak discharge − time of peak rainfall = 16 − 9 = 7 hours.
9. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
4 hours
Lag time = time of peak discharge − time of peak rainfall = 6 − 2 = 4 hours.
10. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 20:00 on the same day. What is the basin lag time in hours?
11 hours
Lag time = time of peak discharge − time of peak rainfall = 20 − 9 = 11 hours.
11. On a storm hydrograph, peak rainfall occurs at 04:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
2 hours
Lag time = time of peak discharge − time of peak rainfall = 6 − 4 = 2 hours.
12. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 14:00 on the same day. What is the basin lag time in hours?
4 hours
Lag time = time of peak discharge − time of peak rainfall = 14 − 10 = 4 hours.

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Storm hydrograph lag time

Take your time. Show your thinking.

1. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 18:00 on the same day. What is the basin lag time in hours?
07 · 00 · 18 · 00 · Storm hydrograph lag time
2. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 11:00 on the same day. What is the basin lag time in hours?
07 · 00 · 11 · 00 · Storm hydrograph lag time
3. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 08:00 on the same day. What is the basin lag time in hours?
03 · 00 · 08 · 00 · Storm hydrograph lag time
4. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 12:00 on the same day. What is the basin lag time in hours?
03 · 00 · 12 · 00 · Storm hydrograph lag time
5. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 07:00 on the same day. What is the basin lag time in hours?
02 · 00 · 07 · 00 · Storm hydrograph lag time
6. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 21:00 on the same day. What is the basin lag time in hours?
10 · 00 · 21 · 00 · Storm hydrograph lag time
7. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 09:00 on the same day. What is the basin lag time in hours?
02 · 00 · 09 · 00 · Storm hydrograph lag time
8. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 16:00 on the same day. What is the basin lag time in hours?
09 · 00 · 16 · 00 · Storm hydrograph lag time
9. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
02 · 00 · 06 · 00 · Storm hydrograph lag time
10. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 20:00 on the same day. What is the basin lag time in hours?
09 · 00 · 20 · 00 · Storm hydrograph lag time
11. On a storm hydrograph, peak rainfall occurs at 04:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
04 · 00 · 06 · 00 · Storm hydrograph lag time
12. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 14:00 on the same day. What is the basin lag time in hours?
10 · 00 · 14 · 00 · Storm hydrograph lag time

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Storm hydrograph lag time

Answers and reasoning. Review before teaching.

1. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 18:00 on the same day. What is the basin lag time in hours?
11 hours
Lag time = time of peak discharge − time of peak rainfall = 18 − 7 = 11 hours.
2. On a storm hydrograph, peak rainfall occurs at 07:00 and peak river discharge occurs at 11:00 on the same day. What is the basin lag time in hours?
4 hours
Lag time = time of peak discharge − time of peak rainfall = 11 − 7 = 4 hours.
3. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 08:00 on the same day. What is the basin lag time in hours?
5 hours
Lag time = time of peak discharge − time of peak rainfall = 8 − 3 = 5 hours.
4. On a storm hydrograph, peak rainfall occurs at 03:00 and peak river discharge occurs at 12:00 on the same day. What is the basin lag time in hours?
9 hours
Lag time = time of peak discharge − time of peak rainfall = 12 − 3 = 9 hours.
5. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 07:00 on the same day. What is the basin lag time in hours?
5 hours
Lag time = time of peak discharge − time of peak rainfall = 7 − 2 = 5 hours.
6. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 21:00 on the same day. What is the basin lag time in hours?
11 hours
Lag time = time of peak discharge − time of peak rainfall = 21 − 10 = 11 hours.
7. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 09:00 on the same day. What is the basin lag time in hours?
7 hours
Lag time = time of peak discharge − time of peak rainfall = 9 − 2 = 7 hours.
8. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 16:00 on the same day. What is the basin lag time in hours?
7 hours
Lag time = time of peak discharge − time of peak rainfall = 16 − 9 = 7 hours.
9. On a storm hydrograph, peak rainfall occurs at 02:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
4 hours
Lag time = time of peak discharge − time of peak rainfall = 6 − 2 = 4 hours.
10. On a storm hydrograph, peak rainfall occurs at 09:00 and peak river discharge occurs at 20:00 on the same day. What is the basin lag time in hours?
11 hours
Lag time = time of peak discharge − time of peak rainfall = 20 − 9 = 11 hours.
11. On a storm hydrograph, peak rainfall occurs at 04:00 and peak river discharge occurs at 06:00 on the same day. What is the basin lag time in hours?
2 hours
Lag time = time of peak discharge − time of peak rainfall = 6 − 4 = 2 hours.
12. On a storm hydrograph, peak rainfall occurs at 10:00 and peak river discharge occurs at 14:00 on the same day. What is the basin lag time in hours?
4 hours
Lag time = time of peak discharge − time of peak rainfall = 14 − 10 = 4 hours.

12 questions · Seed 44 · Age guidance, not curriculum certification