Two general methods exist for artificially destratifying an impoundment: (a) pneumatic destratification using compressed air jets, and (b) hydraulic destratification using water jets. Results from laboratory parametric investigations of hydraulic destratification are presented for a variety of test conditions. A practicable limit of destratification, the 80 percent mixed state, was identified and regression analysis used to define the time required for development of this 80 percent mixed state in terms of reservoir geometry, stability, and pumping rates. Results of the regression analysis showed the dimensionless mixing time to the 80 percent mixed state to be a function of a “destratification” densimetric Froude number. The use of these results in a design procedure is discussed.