Kirkham's Equation
Pothole with tile drain system
Input Parameters
=
acres
=
ft
=
ft
=
ft
=
ft
Single drain
Multiple drains
=
in/hour
Calculate K
select
2 layers
3 layers
4 layers
N/A
=
ft
Calculate L
t
select
2 laterals
3 laterals
4 laterals
5 laterals
N/A
Tile
Drain tube
=
select
4
5
6
8
10
>= 12
N/A
in
=
select
6
9
12
N/A
in
Intermediary Results
=
ft
=
ft
3
/hr
g
=
(for multiple drains only)
Final Results
=
days
=
ft
3
Notes
