How to model ponding of rainfall on a surface

Discussion created by amberlina on Feb 2, 2011
Latest reply on Feb 3, 2011 by withershin
Hi all,

I've gotten stumped with my model of ponding on an impermeable surface.  I have a DEM of the surface and the corresponding daily rainfall field for a year of data.  What I need to do is pour the water onto the surface each day and see where ponds occur (with the assumption that all sinks are natural, which I'm pretty confident in) but I just can't figure out how to do it, if it can be done, in ArcMap.

I've used FlowAcc weighted with the rainfall field but that just gives me sinks.  I can't figure out how to weight 'Fill' so that the water is in line with my rainfall field.  I thought about trying ArcHydro but it's not readily available.  Does anyone know how I can tackle my problem and if ArcHydro would help?

Thanks for reading!