Start | Index | Overview • PREV | UP | NEXT Irrigation has to be provided as an array cIRRTAB, where the entries containing DOY of irrigation alternate with entries containing corresponding irrigation amount: .
E. g.:
| DOY | 50 | 180 | 320 |
| Amount | 130.5 | 120 | 127.3 |
has to be provided as array
| 50 | 130.5 | 180 | 120 | 320 | 127.3 |
This is the way interpolation tables are handled in FST (see also FSTFunctions). Lintul5 uses this mechanism for irrigation.
AppliedIrrDepth takes then on each DOY in cIRRTAB the corresponding value. If the DOY is not in the table then AppliedIrrDepth is 0.
The applied irrigation volumes are added to the input variable iRAIN and the sum is output in the output variable RainAndIrrigation
In order to avoid unproductive rainfall run-off at the days of irrigation, the user can specify the amount of rain cMaxRainWithoutRunoff below which no surface run-off can occur (default is 0.0 mm d-1). Only if iRAIN exceeds this threshold cMaxRainWithoutRunoff at any day with irrigation, then CalculateRunoff is set to true.
| Content Type | Name | Description | Data Type | Unit | Min Value | Max Value | Default Value |
|---|---|---|---|---|---|---|---|
| constant | cIRRTAB | table with effective applications of irrigation water as function of day number (DOY) | DOUBLEARRAY | mm/d | - | - | - |
| constant | cMaxRainWithoutRunoff | maximum precipitation at which no runoff is calculated | DOUBLE | mm/d | - | - | 0.0 |
| input | iRAIN | precipitation | DOUBLE | mm/d | - | - | 0.0 |
| out | AppliedIrrDepth | daily applied depth of irrigation | DOUBLE | mm/d | - | - | 0.0 |
| out | CalculateRunoff | - | BOOLEAN | - | - | true | |
| out | RainAndIrrigation | precipitation + irrigation | DOUBLE | mm/d | - | - | 0.0 |