What are two factors that could slow the transfer of water from the reservoir flask to the receiving flask

The two factors that could slow the transfer of water from the reservoir flask to the receiving flask are pressure on the balloon, amount of water in flask. Water transfer is the movement of water from one place to another using water pipes, reservoir flask and others. Increasing the pressure on the flask and the amount of water will slow down the transfer of water by decreasing its velocity. 

This post might have the info you need: