Circular section

m 0.51 - 7.01swap_horizontal_circleCulvert diameter =
m 0.6 - 1.80

m 1.01 - 16.01swap_horizontal_circleCulvert diameter =
m 0.8 - 2.80

m 1.01 - 12.51swap_horizontal_circleCulvert diameter =
m 1.36 - 6.40

m 1.01 - 2.50swap_horizontal_circleCulvert diameter =
m 1.57 - 7.48