Lagoon liquid depth should suit the purpose of the test. To determine average seepage rates, lagoons should be at average operating depth. In priority areas, any rate of seepage greater than zero may warrant direct sampling and monitoring of the groundwater. However, this low rate can cause groundwater contamination where lagoon contents are strong and background levels are high quality. Each cell of a lagoon needs to be equipped with a staff gauge for level measurements.
Equivalent equipment is acceptable.
Rain Gauge . Qualimetrics Model 6330. Qualimetrics Model 6821. Qualimetrics Model 6831. To obtain accurate measurements, the equipment needs to be set up level and plumb in an unsheltered area near the lagoon.