An isochrone is a line on the basin map

1.	An isochrone is a line on the basin map
A.	Joining raingauge stations having equal rainfall-duration
B.	Joining points having equal rainfall depth in a given time interval
C.	Joining points having equal time of travel of surface runoff to the catchment outlet
D.	Joining points which are at equal distance from the catchment outlet
Answer» D. Joining points which are at equal distance from the catchment outlet

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An isochrone is a line on the basin map

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