Question

in pond why inlet pipe is provided with screen​

Answer 1

The inlet pipe is provided with screen to control trash and fish.

Explanation:

There are three main types of inlet structures :

1) pipe inlet;

2) open gutter inlets;

3) canal inlets.

The sole purpose of inlet structure is to control the amount of water flowing into the ponds at all times. The ponds that are supplied by rain, surface runoff and groundwater  does not require inlet structures. The inlet should have a screen because it prevents wild fish, trash and dirt from entering when pond is being filled. The siphon usually do not have a screen because they are very small but outlet should have a screen to keep your fish from getting away when you empty your pond.