In a horizontal pipe with length L, the diameter decreases from D start to D end as shown in the Figure above.
If water flows from left to right and the head loss due to pipe friction is not negligible which one of the following cases describes the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) correctly?

Question

In a horizontal pipe with length L, the diameter decreases from D start  to D end  as shown in the Figure above. 
 If water flows from left to right and the head loss due to pipe friction is not negligible which one of the following cases describes the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) correctly?

Answer

Energy grade line (EGL) is constant, and hydraulic grade line (HGL) is parallel to EGL.

Answer

Energy grade line (EGL) is descending, and hydraulic grade line (HGL) is parallel to EGL.

Answer

Energy grade line (EGL) is constant, but hydraulic grade line (HGL) is descending.

Answer

Energy grade line (EGL) is descending, but hydraulic grade line (HGL) is descending steeper.

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In a horizontal pipe with length L, the diameter decreases from D start to...

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