approximaitly 30meter (98ft) and its diameter is 3 to 8 ft...
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Volume of water = (pi) x (Radius of the well)2 x (depth of the water)
if the pool is rectangular, then the formula of base X height X depth will do well
You need the total volume as well, then divide that successively by width and length
Real depth Dr= Apparent depth/ refractive index of water Dr= Da / n water