flow paths in urban areas

Question

Aiming at a map of urban area flow paths caused by extreme rainfall I am trying to figure out the most reasonable approach.

What I can apply:

ArcGis 9.3.1 (ArcView licence)

ArcHydro Tools 9 version 1.4.0.256

a DEM with 1-m-resolution (~ 200 km^2)

layers of river net, buildings, streets and project area outline

unfortunately only a rather limited amount of time, as it is only one aspect of my project.

Any advise on whether it is a good idea at all to use ArcHydro, things to do and to avoid is highly appreciated! My impression is that most people use ArcHydro on landscape scale. Do I overlook an alternative other than a costly (in terms of money and time) hydrological model?

Inga

MarkBoucher · Answer

I looked over the file location options that I can see and found nothing.

Then I did a search and found this: Redirect ArcHydro 2. temp directory​. It looks like the temp directory used by ArcMap and Arc Hydro is the same Windows default directory.

I followed the instructions in my Windows 7 environment and it worked.

MarkBoucher · Answer

I haven't done anything other than make a directory I named \GIS on my C: drive. I've not mess with partitions.

I don't know off hand how to change the temp file location.

IngaFrerk · Answer

Hi Mark, appreciate your answers and suggestions.

I will do the following:

- create a raster with larger grid size

- chew the implication of filling sinks over

- start DEM Reconditioning following the hints you gave.

Before getting started I have two more questions @Also, processing from your local drive is much faster then processing over the network.:

Is that C:\ coercively or does another partition of the same hard drive do as well?

And is there an option to tell ArcHydro where to put the temp files? (I did read about setting the target location in your problem solver collection.) My first tests (not even using that DEM monster) crammed the machine's C:\ drive with fairly big temp files.

Have a good weekend,

Inga