Estimating Average Depths of Ponds

Average depths of 35 ponds were computed by reliable mapping techniques. Average depths were also estimated from maximum depths X 0.4, soundings made along several transects across ponds, and sounding made along a single S-pattern over ponds. Assuming that average depths by mapping were accurate, averages of relative errors by other procedures were: maximum depth X 0.4, 12.60/0; transects, 9%; and S-pattern, 5.4%. The S-pattern required fewer soundings and.was the most reliable. If mapping is not feasible, 12 to 24 soundings made along an S-pattern over a pond will provide a suitable value of average depth for computing pond volume.