Discussion
Match the terms in Column I with the suitable hydrometeorological variables in Column II.
| Column I | Column II | ||
|---|---|---|---|
| P | Isopleth | 1 | Rainfall |
| Q | Isobath | 2 | Pressure |
| R | Isohyet | 3 | Evapotranspiration |
| S | Isochrone | 4 | Groundwater |
| T | Isobar | 5 | Surface runoff |
Answer: C
The correct matching is P-3, Q-4, R-1, S-5, T-2.
An isohyet joins points of equal rainfall (R-1), and an isobar joins points of equal pressure (T-2). An isobath joins points of equal depth, used in groundwater maps for equal depth to the water table (Q-4). An isochrone joins points of equal travel time to the outlet of a catchment and is used to route surface runoff (S-5). That leaves the isopleth, a general line of equal value of any variable, for evapotranspiration (P-3).
The first option swaps isopleth and isobath, the second pairs isochrone with evapotranspiration and isopleth with runoff, and the last swaps rainfall and pressure between the isohyet and the isobar.
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