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Rohit Rana

· started a discussion

· 1 Months ago

Doubt (Question: 331953.0 )

Please elaborate the answer.

Question:

In a free nappe:

Options:
A)

The pressure below the nappe is atmospheric

B)

the pressure below the nappe is negative

C)

the pressure above the nappe is atmospheric

D)

the pressure above the nappe is negative

Solution:

Ans: (a)

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
Please refer the below statement,

Nappe:- It is that part of water which is falls downward from above, over weir.

Three types of nappe:

1. Free nappe.
2. Depressed nappe.
3. Clinging nappe.

In free nappe the water falls away from the weir wall so air gap generate beneath the nappe. This air is at atmospheric pressure.

In depressed nappe the air gap remains small so the pressure of air remain below the atmospheric pressure called negative pressure.

But in clinging nappe no air gap remains so no pressure remains because water falls from the weir as a clutched with wall.

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