[Iowa Granny]

Farming is one of the top 5 most dangerous professions in the world.

Earthern lagoons are routinesly 15-20 ft deep, depending on the diameter. There's some wierd mathamatical formula,, can't exactly recall.

[HEY4QDEMS]

There's some wierd mathamatical formula

Which adds up to a lot of sh!t.

[shotgun]

The formula is Length x Width x Depth = Volume in cubic feet.
Volume of runoff = # of Cows x daily output(in cubic feet)/Cow x Desired detention time (Days)

The type of soils and sub-surface geological conditions will dictate the detention time required for the liquid effluent to percolate into the soils. Take this information to your Civil Engineer and they can size your pond.