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Thanks everyone. I'm not looking for "flow rates", I want to make gallon measurements on my site level gauges. As I said above, the tanks come with estimates but I'd like to measure them out. The charts don't match the tanks. All I wanna know is, how much sap I have in each tank by gallons. Eventually it will help me determine my evaporation rate.
My Dad likes a mathematical challenge and caluclated the volume of the round bottom CDL tanks we used. We have a 4x8x4, 4x12x4, 4x16x4, and 4x16x5 tanks. He has done charts from the bottom to the top and top to the bottom. When running the RO and calculating the amount in the permeate tank (4x12x4) and the primary holding tank (now 4x16x5) we find the charts are in agreement in the volume. We have a CDL round bottom 230 gallon tank which we haven't run the calculations on. It is our feed tank.
If you figure out the radius of the round area you can work towards the sqaure inches. Then you can work on the length of the tank to determine the volume. It would be nice if CDL did it once and then added hash marks on the ends of their tanks.
Edited to add: I would be interested in a flow meter in the woods to measure the amount of sap pumped to the tanks by the releasers.
Mike