Isochrone maps - are they widely available?

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Isochrone maps are sought for a water contamination analysis, specifically to calculate runoff into a river using the time-area method. The user has found limited information online, primarily about the concept rather than available maps. There is a mention of the rational method as an alternative for runoff calculations, but the preference remains for the time-area method. The discussion also touches on the relevance of these calculations to the Sahara Desert and references EPA resources that may provide useful information on runoff into rivers and lakes. However, the utility of the EPA document remains uncertain in this specific context.
WaterEngineer
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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 time-area 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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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.
 
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