# Units of Max Flow

chanda
Posts:

**4**
Dear All, Kindly assist with the units of the max flow as computed in global mapper. I have attached a screen shot of this. What would be the units of this.

Kind Regards

Kind Regards

## Answers

1,682The flow is a count of the number of cells that flow in or out of the stream. You could convert to a unit of area by multiplying by the area of a single cell (sample spacing X * sample spacing Y).

Cheers,

Bob

41,682Cheers,

Bob

4would there be a way to generate a hydrological figure in terms of the flow in cubic meters per second from this? say precipitation multiply by catchment area by some factor of cell count, e.t.c?

381Trusted UserIn my area, we would love to have an estimation of precipitation for a known watershed, possibly from weather radar.

https://ams.confex.com/ams/pdfpapers/21960.pdf

Our knowledge of current conditions would simply allow an estimation of drainage volume and timing. We would not have any estimation of flow. However the precipitation estimate would be much better than relying on a few rain gauges around the edge of the watershed, without any information about how much of the storm was inside your watershed or in a neighboring one while both cases will fill the rain gauge.

So, Global Mapper can provide the area within a watershed. An estimate of flow at the drainage point requires a lot more information, with several values being highly variable due to current conditions.