Pick up the correct statement from the following

• Approach of the water line in a flumed channel section should not be steeper than
• Departure of the water line from a flumed channel section should not be steeper than 30°
• Approach of the water line should not be steeper than 30° and departure line not steeper than in a flumed channel section
• Approach and departure of the water line in a flumed channel section, should not be steeper than