klpd full form is Kilo Litres Per Day.

Kilo litres per day is a measure of volume flow rate

 kL/d ≈ 0.000 011 574 074 074 074 m3/s. 1 Liter per Day: Volume flow rate of 1 liter per minute. A flow of 0.001 cubic meters per 86400 seconds (SI units)