In the graphical method of obtaining flow nets, if the lowest flow line confirms to the bottom boundary conditions, the flow net:

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UPPCL JE CE 2016 Offical Paper

Option 1 : Is correct

CT 3: Building Materials

3014

10 Questions
20 Marks
12 Mins

__Concept:__

**Flow net:**

- A Flow net is a
**graphical representation of the flow of water through a soil mass**. It is a curvilinear net formed by the combination of flow lines and equipotential lines. - Equipotential lines are formed by connecting the points of equal total head.

**Properties of Flow Net:**

- The angle of
**intersection between each flow line and an equipotential line must be 90**which means they should be orthogonal to each other.^{o} - Two flow lines or
**two equipotential lines can never cross each other.** **The flow net is correct. if the lowest flow line confirms to the bottom boundary conditions.**- An equal quantity of seepage occurs in each flow channel. A flow channel is a space between two flow lines.
**Head loss is the same between two adjacent potential lines.**- Flow nets are drawn based on the boundary conditions only. They are independent of the permeability of the soil and the head causing flow.
- The space formed between two flow lines and two equipotential lines is called a
**flow field.**It should be in a square form.