Attributes: RAND (rate (m³/TU) per m or m²), RANQ (rate (m³/TU) for the complete polyline), RANX (rate (m³/TU) per m(x0) or m(x)*m)

With the attributes RAND, RANQ and RANX along a line in-and outflows can be set. Inflows are positive, outflows are negative.

Meaning of column 16 in the model file:

'*' = the transformation of the rate to node wise values considers the thickness (at present only for 2D models).

RAND without '*':

The value represents a rate per meter along the polyline. The distance is obtained from the distance between the nodes. The corresponding inflow / outflow rate is computed for each node depending on the part of the polyline which corresponds to the node.

RAND with '*':

The value represents a rate per m². The area is obtained from the distance between the nodes multiplied by the width of the model (thickness). The thickness is averaged from the edges to the adjacent elements. The corresponding inflow / outflow rate is computed for each node depending on the part of the area which corresponds to the node.

RANQ without '*':

The value represents a total rate for the polyline (m). The sum is distributed to the nodes of the polyline corresponding to the partial distances.

RANQ with '*':

The value represents a total rate for an area (m²). The area is obtained from the complete distance multiplied by the width of the model (thickness). The sum is distributed to the nodes of the polyline corresponding to the partial areas (distance * thickness).

RANX without '*':

The value represents a rate per meter x-coordinate. In contrast with , the distance is computed using only the x-coordinates of the nodes. The corresponding inflow / outflow rate is computed for each node depending on the part of the polyline which corresponds to the node.

RANX with '*':

The value represents a rate per meter x-coordinate * m. In contrast with , the distance is computed using only the x-coordinates of the nodes multiplied by the width of the model (thickness). The thickness is averaged from the edges to the adjacent elements. The corresponding inflow / outflow rate is computed for each node depending on the part of the area which corresponds to the node.

The following figure shows a part of a model with different boundary inflows. The section of the *.net file refers to this figure.

 

Example:

RAND

20.00 200, 6, 5, 11, 7

0.50 * 200, 92, 88, 60,

RANQ

300.00 1, 70, 75, 99,

RANX

1.00 * 60, 67, 76, 80,

 

Boundary inflow over the left edge (nodes 200, 6, 5, 11 and 7) of 20 m³/m/TU.

 

Areal seepage for the area F1 with 0.5 m³/m²/TU. The area is computed from the distance between the nodes from 200 to 92 multiplied by the width (thickness).

 

Boundary inflow over the right edge (nodes 1, 70, 75, and 99) with a total rate of 300 m³/TU.

Areal seepage for the area F2 (nodes 60, 67, 76 and 80) of 1.0 m³/m²/TU. F2 can represent the water surface of a river where the infiltration rate is often defined in m³/km/TU. This unit is transformed into m³/m²/TU.

Nodes 200 and 60 automatically have two inflow parts (node 200 from two RAND definitions, node 60 from both a and a RANX definition).