How to Determine the Gallons in a Lagoon

 

 

• To determine total gallons of water in a lagoon you first need to find 4 measurements:

        (1) width of top of water, 
(2) length of top of water,
(3) water depth, and
(4) slope of bank.

• To determine the slope of the bank; you use two tape measures and determine how much of a run is required to make a one foot drop.   Most banks are 3:1 or three feet run for every foot drop.

        TOW = Top of Water
BOW = Bottom of Water
AOW = Average of Water

Accurate Total Gallons = Average Square feet of Lagoon x Water Depth x 7.5

 

Top of Water Square Feet (TOWsf.) = TOW. of length x TOW of width

 

Bottom of Water Square Foot (BOW sf.) = (TOW length – total run) x (TOW width – total run)

 

Average Square Foot of Lagoon (AOWsf) = (TOWsf + BOWsf ) / 2

 

Total Run is determined from slope of bank.  See example as follows:

                  Run of 3:1 slope = depth of water x 3 foot run for every foot drop x 2 banks

                  Run of 4:1 slope = depth of water x 4 foot run for every foot drop x 2 banks

 

Example: 

Measurements = 300 length of top of water; 200 width of top of water; 15 water depth; 3:1 slope

 

                  Run =   3 x 15 x 2   =   90 feet

                  TOWsf =   300 x 200   =   60,000 sf

                  BOWsf =   (300-90) x (200-90)   =   210 x 110   =   23,100 sf

                  AOWsf =   (TOWsf + BOWsf) / 2   =   (60,000 + 23,100) / 2  =  83,100 / 2   =   41,500 sf

                  Gallons in Lagoon = 41,500 (AOW) x 15 (depth of lagoon) x 7.5 (gallons per ft3) = 4,668,750 gallons

 

 

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