The mean rainfall over a catchment has to be estimated. The data for four rain gauges located in and around the catchment is listed in the table. Which one of the following statements is correct:
| Rain guage station |
P |
Q |
R |
S |
| Whether located inside the catchment |
Yes |
Yes |
Yes |
No |
| Thiessen weightage factor |
$0.25$ |
$0.50$ |
$0.10$ |
$0.15$ |
| Rainfall (mm) |
$100$ |
$110$ |
$100$ |
$125$ |
- The estimate obtained from the Thiessen-mean method is greater than that obtained using the arithmetic-mean method
- The estimate obtained from the Thiessen-mean method is equal to that obtained using the arithmetic-mean method
- The estimate obtained from the Thiessen-mean method is less than that obtained using the arithmetic-mean method
- The Thiessen-mean method cannot be applied in this case
