Question

Which of the following statements is/are correct?

1. Isochrones are curves of equal pore water pressure

2. Isochrones depict the variation of the pore water pressure along with the depth of the soil sample

3. Isochrones vary with time

1. 1 only
2. 2 and 3 only
3. 1 and 2 only
4. 1, 2 and 3

Answer 1

Correct Answer - Option 2 : 2 and 3 only

Explanation:

Isochrones:

Isochrones is a line on the map which connects points having an equal time of travel of the surface runoff to the catchment outlet. These are some property of Isochrones:

• Isochrones vary with time, It's most commonly used to depict travel times, such as drawing a 30 minute travel time perimeter around a start location. The isochrone below joins up all points within a 45-minute drive from the origin. 
• Isochrones depict the variation of the pore water pressure along with the depth of the soil sample.
• Isochrones are mainly used for transport planning, property search, sales territory planning, etc. 

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Isobar	Equal Pressure line
Isohyets	Equal Rainfall line
Isopleths	Equal Evapotranspiration line
Isotherm	Equal Temperature line
Isonif	Equal Snowfall line