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Isochrone maps  are they widely available? 
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#1
Dec1911, 08:10 AM

P: 4

I need isochrone maps for a water contamination analysis. Does anyone know if these are widely available? A quick google search hasn't given me much, just information on what they are.
I could use the rational method to calculate the runoff instead, but I would rather the timearea method, for which I need the isochrone maps. Ideally I would like to calculate the amount of runoff going into the river at different points along it. 


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#2
Dec1911, 10:56 AM

P: 5,462

Would these be for the Sahara Desert?
I am, of course guessing from your time of posting and therefore your probable time zone, in the absence of better information. 


#3
Dec1911, 06:32 PM

PF Gold
P: 1,880

From our EPA, this seems to deal with runoff calculations into rivers and lakes. I am not sure if this will be useful or not...
http://nepis.epa.gov/Exe/ZyNET.exe/2...es=5&ZyEntry=1 


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