In hydrogeology, an isochrone represents
- Aa line connecting points of equal groundwater head
- Ba line representing points that experience equal travel time of groundwaterCorrect
- Ca contour line showing equal depth to the water table
- Da curve depicting equal rates of groundwater recharge
Solution
Concept
Definition of isochrone in hydrogeology
Formula
NONE
Step-by-step solution
1. Isochrones are imaginary lines on a map connecting points with an equal value of a time-related or hydrological parameter. Answer: B
Explanation
An isochrone is a contour line on a map that joins points from which water takes an equal amount of travel time to reach a designated outlet or point of interest. This concept is crucial for estimating runoff arrival times and hydrograph response times. Therefore, option B correctly defines an isochrone.
Why the other options are wrong
A) Lines connecting points of equal groundwater head are called equipotential lines. C) Contour lines showing equal depth to the water table are called isobaths.
Shortcut
Isochrone = line of equal time ("iso" = equal, "chrone" = time/travel time).
Common mistake
Confusing an isochrone with an equipotential line and selecting option A instead of identifying it as a line of equal travel time.
Correct answer: B) a line representing points that experience equal travel time of groundwater