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# setup pollution source in RMA4

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How to setup the point pollution source in RmA4 module? for example, how to create a point source on a rectangular interested area.

Many thanks!

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Wildcat,

In versions of RMA4 older than 4.5 you could use a BLN card to input a point source, this has been removed from the newer version (pg 44 of RMA4 manual):

"In order to estimate the total load using the internal concentration specification two

separate runs would have to be made and the integral above evaluated, which is

nontrivial. Because of the nontrivial nature of a point source specification, the

capability of a "BLN" input was removed with RMA4 version 4.5.

However, mass loading by element is a easier concept. If the BLE card is used the

user specifies the total mass loading rate m in mass/sec (kg/sec in this example) for a

given element. The model internally converts the specification into a concentration

loading, L, by dividing this by the volume of the element (rather than node) into

The only other option would be using the BLE card (element mass loading). This is done by adding a boundary condition to an element.

Cheers,

Cameron

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Wildcat,

In versions of RMA4 older than 4.5 you could use a BLN card to input a point source, this has been removed from the newer version (pg 44 of RMA4 manual):

"In order to estimate the total load using the internal concentration specification two

separate runs would have to be made and the integral above evaluated, which is

nontrivial. Because of the nontrivial nature of a point source specification, the

capability of a "BLN" input was removed with RMA4 version 4.5.

However, mass loading by element is a easier concept. If the BLE card is used the

user specifies the total mass loading rate m in mass/sec (kg/sec in this example) for a

given element. The model internally converts the specification into a concentration

loading, L, by dividing this by the volume of the element (rather than node) into

The only other option would be using the BLE card (element mass loading). This is done by adding a boundary condition to an element.

Cheers,

Cameron

Thanks so much, Cameron.

I would have replied your post much earlier but the Internet speed was not such good to do so.

Although a minor problem of setting element for rma4 exist, it will be solved in this weekend

Regards,

Jiping Jiang

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• 3 weeks later...

Wildcat,

In versions of RMA4 older than 4.5 you could use a BLN card to input a point source, this has been removed from the newer version (pg 44 of RMA4 manual):

"In order to estimate the total load using the internal concentration specification two

separate runs would have to be made and the integral above evaluated, which is

nontrivial. Because of the nontrivial nature of a point source specification, the

capability of a "BLN" input was removed with RMA4 version 4.5.

However, mass loading by element is a easier concept. If the BLE card is used the

user specifies the total mass loading rate m in mass/sec (kg/sec in this example) for a

given element. The model internally converts the specification into a concentration

loading, L, by dividing this by the volume of the element (rather than node) into

The only other option would be using the BLE card (element mass loading). This is done by adding a boundary condition to an element.

Cheers,

Cameron

Thanks you for the post.

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