What is the difference between an open channel flow and sheet flo.pdf

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What is special about the skulls of Lagomorphs? Sagittal crest The skull is fenestrated Deeply roted molars Incomplete zygomatic arch Solution special about the skulls of Lagomorphs is The skull is fenestrated Explination= in case of Lagomorphs on various places on skull surface ,the bone is exceedingly porous or perforated & this screen like structure is called fenestrae or with windows.

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What is the difference between an open channel flow and sheet flow in a watershed?
What is the difference between an open channel flow and sheet flow in a watershed?
Solution
I have listed the main differences between open channel flow & sheet flow in overland. These
are,
1) Definition: Starting with definition, open channel is a flow in which fluid flow with a free
surface open to the atmosphere. For example rivers, canals , streams etc. Now coming to
overland sheet flow, it is a special type of open channel flow which generally occur in urban
watershed impervious layers such as roofs, parking lots as well as pervious layers such as lawn.
2) Depth: The most important difference is depth. Sheet flow is a shallow depth flow which has a
depth of few inches whereas open channels have depth in feet.
3) State of Flow: Depending upon the characteristics of flow, open channel can be classified as
laminar, transisition or turbulent. But in case of sheet flow, the reynolds number is low because
depth of flow is very less. There based on this, sheet flow should be classified as open channel
flow, however many factors affects sheet flow like obstruction due to grass, rainfall impact etc.
which cause the flow turbulent dispite having low reynolds number.
4) Mannings coefficient (n): The mannings coeff. used for overland sheet flow are slightly
different than open channel flow. This is because the mannings coeff. for sheet flow also
accounts disturbance due to fator like grass, rock, litter, rainfall impacts, erosion, trabsortation of
sediments and surface drag & therefore effective manning coeff. is used.
However all equations applicable to open channel flow are also appliable for sheet flow.

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