Variable Flow Rate Settings
It is often useful to set several flow rates for varying water heights. This is easy to achieve with an inline controller by adjusting the gaps between several stop logs. For example, suppose we want to set the controller to pass a lot of water when the pond is full, less water as the pond level is lowered and a small flow below a minimum level:
Full Flow above the maximum desired water level.
Half flow at 12 inches below the maximum water level
Ten percent flow at 24 inches below the maximum water level.
The height of each stoplog panel is 6 inches
The area of a six-inch pipe is 28.3 square inches.
The inside width of the six-inch inline controller is 7 inches.
10% of of the 28.3 pipe area is 2.83 square inches. 2.83 square inches divided by 7 inches wide is 0.4 inches.
Open a 0.4 inch gap between the 4th and 5th stoplogs from the top.
50% of remaining flow - 10% additional flow = 40% 40% of 28.3 is 11.23 square inches. 11.23 divided by 7 is 1.6 inches.
Open a 1.6-inch gap between the 2nd and 3rd stoplogs from the top
