The 'Isochrone' in hydrology is a line connecting points:
Choose the correct answer
Of equal rainfall depth
With equal travel time to the watershed outlet — used for time-area diagrams and Clark''s UH method
Of equal elevation (contours)
Of equal infiltration rate
Correct Answer
B. With equal travel time to the watershed outlet — used for time-area diagrams and Clark''s UH method
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Isochrone: line connecting all points in a catchment that are equidistant in travel time from the catchment outlet. Zones between isochrones (isochronal zones) contribute runoff to outlet over equal time intervals. Used to: construct time-area curve → base for Clark''s unit hydrograph method. All points on one isochrone arrive at outlet simultaneously.
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