Seepage calculation for flow net

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Discussion Overview

The discussion revolves around the calculation of seepage flow rates in a flow net, specifically addressing the interpretation of area in relation to flow rate equations and the geometry of the flow net. The scope includes homework-related queries and conceptual clarifications regarding hydraulic gradients and area definitions.

Discussion Character

  • Homework-related, Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions the correctness of the area definition in the flow rate equation, suggesting it should be based on the square of a length rather than the lengths provided.
  • Another participant proposes that the area might be considered as a length, raising the question of why only certain lengths are included.
  • A different participant clarifies that the area is oriented perpendicular to the direction of seepage, indicating that the other dimension extends "into the page," which relates to calculating seepage flow per unit width.
  • One participant reiterates the point about calculating seepage flow per unit width into the page, affirming the previous clarification.

Areas of Agreement / Disagreement

Participants express differing views on the definition of area in the context of the flow rate equation, with no consensus reached on the correct interpretation or calculation method.

Contextual Notes

There are unresolved assumptions regarding the geometric interpretation of the flow net and the implications of the area definition on seepage calculations.

tzx9633

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 ?

Homework Equations

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]
 

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Or the area is considered as length here ? So, only $$l1$$ , $$l2$$ and $$l3$$ are considered ??
 
The other length forming the area is not the other side of the square. The area A is oriented perpendicular to the direction of seepage, and the other length is "into the page." They are getting the seepage flow per unit width into the page.
 
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Chestermiller said:
They are getting the seepage flow per unit width into the page.
Thanks !
 

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