Isochrone maps - are they widely available?

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SUMMARY

Isochrone maps are not widely available for specific applications such as water contamination analysis, as highlighted in the forum discussion. The user expressed a preference for the time-area method over the rational method for calculating runoff into rivers, particularly in the context of the Sahara Desert. The Environmental Protection Agency (EPA) provides resources that may assist in runoff calculations, but the availability of isochrone maps remains limited. Users seeking these maps should explore EPA resources and other specialized geographic data services.

PREREQUISITES
  • Understanding of isochrone maps and their applications in hydrology.
  • Familiarity with runoff calculation methods, specifically the rational method and time-area method.
  • Knowledge of geographic information systems (GIS) for mapping and spatial analysis.
  • Basic awareness of environmental regulations and resources provided by the EPA.
NEXT STEPS
  • Research the availability of isochrone maps through GIS platforms like ArcGIS or QGIS.
  • Explore EPA resources for runoff calculation methodologies and related data.
  • Learn about the time-area method for runoff calculations in hydrological studies.
  • Investigate specialized geographic data services that may offer isochrone mapping tools.
USEFUL FOR

Environmental scientists, hydrologists, GIS specialists, and anyone involved in water quality analysis and runoff management will benefit from this discussion.

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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