Here's a formula for round pools:
distance across*distance across*depth*5.9
for rectangles:
length*width*depth*7.5
or for a deep end:
length*width*((shallow end depth + deep end depth)/2)*7.5
so in your case, 16*16*4*5.9=6000 gallons=23000 liters
A 22-foot round pool that is 4 feet deep holds about 43,238.5 liters of water.
About 49,246.3 liters of water.
About 129,715 liters.
About 45,025 liters.
About 39,397 liters.
right at 1809,000 liters
There are 3,634 liters (960 gallons) of water in a pool that is four feet in diameter and 8 feet deep.
Approximately 20016.7 liters
The answer depends on how deep the sump is!
50
If it is a round pool that is 10 feet wide and has 3 feet of water then it contains 1,770 gallons of water.
"3 feet round" is not clearly defined: is that the radius, the diameter, or the circumference?