# Seepage calculation for flow net

## Homework Statement

In the 3rd pictures , it's stated that q ( flow rate) = vA = kiA , so , i = hydraulic gradiene = difference in head between 2 points/ length . But , i am not sure why A ( area) is given by $$l_1$$ , $$l_2$$ and $$l_3$$ only ?

## The Attempt at a Solution

I think the author is wrong . It should be ($$l_1$$^ 2 ) ... instead , because it's forming the square elements( in 2nd picture) . Correct me if i am wrong .[/B]

#### Attachments

• 682.png
26.3 KB · Views: 670
• 683.png
28.5 KB · Views: 519
• 684.png
26.8 KB · Views: 474

Or the area is considered as length here ? So, only $$l1$$ , $$l2$$ and $$l3$$ are considered ??