Definitions of 11 rainfall indices used in this study
| Indices notation . | Indices name . | Units . | Description . |
|---|---|---|---|
| PRCPTOT | Annual total wet-day precipitation | mm | Annual total PRCP in wet days (RR ≥1 mm) |
| R95p | Very wet days | mm | Annual total PRCP when RR >95th percentile of the threshold |
| R99p | Extremely wet days | mm | Annual total PRCP when RR >99th percentile of the threshold |
| RX1day | Max 1-day precipitation amount | mm | Let RRij be the daily precipitation amount on day i in period j. The maximum 1-day value for period j is R × 1day = max (RRij) |
| RX5day | Maximum 5-day precipitation | mm | Let RRkj be the precipitation amount for the 5-day ending k, period j. The maximum 5-day values for period j are: R × 5day = max (RRkj) |
| R10 mm | Number of heavy precipitation days | days | Annual count of days when precipitation ≥10 mm |
| R20 mm | Number of very heavy precipitation days | days | Annual count of days when precipitation ≥20 mm |
| R100 mm | Number of extreme precipitation days | days | Annual count of days when precipitation ≥100 mm |
| CWD | Maximum length of wet spell | days | Let RRij be the daily precipitation amount on day i in period j. Count the largest number of consecutive days where: RRij ≥1 mm |
| CDD | Maximum length of dry spell | days | Maximum number of consecutive days with precipitation <1 mm |
| SDII | Precipitation intensity index | mm | Let RRwj be the total daily precipitation amount on wet days w in period j. If W represents number of wet days in j. Then, SDII = (∑RRwj)/W |
| Indices notation . | Indices name . | Units . | Description . |
|---|---|---|---|
| PRCPTOT | Annual total wet-day precipitation | mm | Annual total PRCP in wet days (RR ≥1 mm) |
| R95p | Very wet days | mm | Annual total PRCP when RR >95th percentile of the threshold |
| R99p | Extremely wet days | mm | Annual total PRCP when RR >99th percentile of the threshold |
| RX1day | Max 1-day precipitation amount | mm | Let RRij be the daily precipitation amount on day i in period j. The maximum 1-day value for period j is R × 1day = max (RRij) |
| RX5day | Maximum 5-day precipitation | mm | Let RRkj be the precipitation amount for the 5-day ending k, period j. The maximum 5-day values for period j are: R × 5day = max (RRkj) |
| R10 mm | Number of heavy precipitation days | days | Annual count of days when precipitation ≥10 mm |
| R20 mm | Number of very heavy precipitation days | days | Annual count of days when precipitation ≥20 mm |
| R100 mm | Number of extreme precipitation days | days | Annual count of days when precipitation ≥100 mm |
| CWD | Maximum length of wet spell | days | Let RRij be the daily precipitation amount on day i in period j. Count the largest number of consecutive days where: RRij ≥1 mm |
| CDD | Maximum length of dry spell | days | Maximum number of consecutive days with precipitation <1 mm |
| SDII | Precipitation intensity index | mm | Let RRwj be the total daily precipitation amount on wet days w in period j. If W represents number of wet days in j. Then, SDII = (∑RRwj)/W |