Due to the fact that there is a 14.3inch deflection in the manometer, water is flowing towards the regions that have low pressure.
How does this water flow to low region areas?
The fluid that is contained in the manometer is moving towards areas of low pressure. This means they are going to areas with high velocity.
The areas that have low cross sections would flow with a constant rate. This venturi would have low pressure because it has low cross sectional area.
The fluid in the device would then have to move from bottom to top towards the neck of the mercury.
Read more on a manometer here: https://brainly.com/question/7980567
