Orifice Head Loss
The head loss due to the orifice is an important parameter because it effects how evenly the water will flow through the orifices. Thus we back calculated the actual head loss achieved given the diameter adjustment that was made to achieve an available drill bit size.
The head loss through the orifice was calculated by using the following equation:
D is the diameter of the orifice (0.7541cm or 19/64"), the minor loss coefficient of the orifice is 0.63, and the flow is the flow through one of the orifices. The minor loss for an orifice was calculated to be 4.54 cm. The head loss through an orifice is parallel to other orifices, so you do not add the head loss in each orifice. So the water level in the plant leveling tank will be approximately 4.54 cm since the launder orifice head loss will be significantly larger then the losses in the piping system between the two tanks.