If it is possible to collect ...

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If it is possible to collect in bucket  then fill the bucket and divide its volume by time taken to fill it which will let you know the water lost in terms of volume per unit of time.Multiply this value by total time the leakage existed which will give you almost exact value of water lost.

If it is not possible to collect directly then either divert water through channel to some pit the volume of which was predetermined  then follow the above said method to determine loss again otherwise if online flow meter is working then it would be easy to determine by subtracting flow values after & before leakage which would give you total losses & when you multiply flow rate by total duration of loss.