Congratulations to Mike Strombach, senior mechanical engineer at the Grand Coulee Power Office, who is the winner of the prize crossword featured in the December issue of IWP&DC. Strombach wins UKĀ£50 and a year's free subscription to the magazine.

For interested readers, answers to the crossword are printed below.

WATER POWER QUICK CROSSWORD No 3 – SOLUTIONS

ACROSS

5. Monuments

8. Tofu

9. Phreatic

10. Plenty

11. Reduce

13. Metric

15. Ice jam

16. Deep well

18. Gage

19. Permanent

DOWN

1. Columnar

2. Supply

3. Terror

4. Etna

6. Pool level

7. Discharge

12. Dredging

14. Creamy

15. Inland

17. Pier