Hole Size Categories (cm)

Hole Diameter^{a} (d; cm)

Hole radius (r = d/2)

Hole Area^{b} (π*r
^{2})

Hole Index^{c}


0.5–2.0

1.25

0.625

1.23

1

2–10

6

3

28.28

23

10–25

17.5

8.75

240.56

196

>25

30

15

706.95

576


^{a}Weights for each size category were estimated assuming that the average hole diameter was the midpoint in each category, except for the largest hole where the average diameter was assumed to be 30 cm

^{b}The approximate area of an average sized hole from each category was estimated by assuming each hole was approximately circular

^{c}Final weights for each size category were then estimated by dividing the area encompassed by a hole in the smallest size category (i.e. 1.23)