High school students surveyed willow trees along a river bank to analyze changes in numbers over time. They found the number of trees had reduced by 5 in the last 9 years, likely due to an increase in wells lowering the water level and reducing humidity needed by the willows. The students concluded more wells should be avoided and existing wells need better control to protect the willow trees.

15. The survey has been carried out in February by 60 by high school students.