What is flow net analysis?
A flow net is a graphical representation of two-dimensional steady-state groundwater flow through aquifers. Construction of a flow net is often used for solving groundwater flow problems where the geometry makes analytical solutions impractical.
How do you draw a flow net diagram?
Steps for Drawing a Flow Net Using Pencil and Paper
- Draw the outline of the flow system to scale and label the nature of each boundary.
- Draw equipotential lines along the boundaries where a single value of hydraulic head is specified along the boundary.
- Draw flow lines along no-flow boundaries.
What are the types of flow net?
As in the one-dimensional saturated-unsaturated case that was schematically illustrated in Figure 2.12, there are three types of output from a numerically simulated, steady-state, saturated-unsaturated flow net in two dimensions.
What is NF and ND in flow net?
Nd = number of potential drops Nf = number of flow channels h = total head loss q = total quantity of unit flow.
What are the components of flow net?
A flow net consists of two sets of lines which must always be orthogonal (perpendicular to each other): flow lines, which show the direction of groundwater flow, and equipotentials (lines of constant head), which show the distribution of potential energy.
What are the properties of flow net?
Properties of flow net are as follows:
- The angle of intersection between each flow line and an equipotential line must be 90o which means they should be orthogonal to each other.
- Two flow lines or two equipotential lines can never cross each other.
- quantity of seepage occurs in each flow channel.
What is NF and ND?
What is exit gradient?
For the soil grain to remain stable, the submerged weight of soil grain should be more than this upward force. This force at any point is proportional to the gradient of the pressure of water at that point. This gradient of the pressure of water at the exit end is called the exit gradient.
What are the properties of a flow net?
Properties of flow net are as follows: The angle of intersection between each flow line and an equipotential line must be 90o which means they should be orthogonal to each other. Two flow lines or two equipotential lines can never cross each other. quantity of seepage occurs in each flow channel.
What is Bligh’s theory?
This theory is base on the assumption that seeping water through the soil below the weir. Follows the path along with the contact of the base, with the underlying sub-soil. The length of the path of seeping water from the point of entry into the sub-soil from the U/S of the impervious.