the rule is to make outflow TWICE the volume of the inlet. That said, have you been introduced to bog filtration yet? Wait for it...
How do you calculate for a weir? I have seen that done before — they were comparing weir width to outflow.the rule is to make outflow TWICE the volume of the inlet. That said, have you been introduced to bog filtration yet? Wait for it...
basically calculate area; the force/Power behind the water would stay the same. I'm sure there's some differences re 'shape' ala rectangle versus circle, becasue water will exit easier with the circular opening than the square one but I doubt it's much of a takeoff. So, area of a pipe, in this case 2" would be 3.14 sq inches and inlet at 1-1/2 is 1.76 sq inches. So you'd need a three inch outlet giving you 7 ish sq inches. Therefore were it mine, I'd cut my weir to have that square area, something like 1" x 7". Or 2.5" x 3". I'm making the math simple as I'm sure other factors contribute but this would give a good working basis for input to output and different shaped openings. Double the size of the inlet is a minimum; nothing stopping you from going larger.
