Drop a cotton or fiber (natural, not synthetic) rope/string down the casing until it hits bottom. Mark the top of the casing on the rope. Measure down until it is wet, that gives you a head dimension. The total length is the depth of the well.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).