Most Economical Circular Section

Most efficient cross section.

Most economical circular section. Lesson 18 of 28 12 upvotes 11 08 mins. Is a maximum which. The most economical section of a triangular channel is one which has its sloping sides at an angle of 45 degree with the vertical.

Most efficient section during the design stages of an open channel the channel cross section roughness and bottom slope are given. As discussed earlier that for a most economical section the discharge slope of bed and resistance co efficient is maximum but in case of circular channels the area of flow cannot be maintained constant with change of flow in circular channels of any radios the wetted area and wetted perimeter changes thus in case of circular section there are two different conditions. 7 5 3 most economical circular channel.

You must ensure that the maximum normal stress caused by the external loads does not exceed the allowable normal stress. Means the perimeter. I e r y 2 2 the most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to half the depth of flow.

Will be a maximum when. A circle has the least perimeter for a given area of any geometric shape. Q const ar 2 3.

For a given area of water cross section q will be maximum when is maximum. A cross section. Since 2 5 8 thus for a given n a and q will be a maximum when is a minimum.

Most economical circular section. Ocf 17 most economical circular section. For a given flow rate.