Coolant leaks
 

Hi,I have 2012 Audi A4 B8 1.8tfsi multitronic and i recently noticed that my coolant consumption and noticed the leaks under,I am told it a water pump which needs to be replaced.
This happens only when there is a high volume of traffic during stop and start but when driving on a free way without interval stops,no problem with coolant.
Any help with this problem?