QGIS ReFH2 to TUFLOW: Difference between revisions
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The user can also specify a duration and a timestep. If no duration is specified, then the ReFH2 to TUFLOW tool will use the recommended duration determined by the ReFH2 software. The recommended duration is a function of the time to peak parameter (Tp) and the catchment average annual rainfall (SAAR). Once the duration is specified, an appropriate timestep is required that meets the requirement that the duration must be an odd multiple of the timestep. Table 1 below shows some common timesteps for some common durations. Where possible it is recommended a timestep between 10% and 20% of the duration should be used.
{| align="center" class="wikitable"
! style="background-color:#005581; font-weight:bold; color:white;"| Duration (HH:MM:SS)
! style="background-color:#005581; font-weight:bold; color:white;" width=50% | Example Timestep Interval (HH:MM:SS)
! style="background-color:#005581; font-weight:bold; color:white;" width=50% | Number of intervals for duration period
|-
|00:15:00 || 00:03:00 || 5
|-
|00:30:00 || 00:06:00 || 5
|-
|01:00:00 || 00:12:00 || 5
|-
|02:00:00 || 00:08:00 || 15
|-
|03:00:00 || 00:12:00 || 15
|-
|06:00:00 || 00:24:00 || 15
|-
|09:00:00 || 00:36:00 || 15
|-
|12:00:00 || 00:48:00 || 15
|}
An error will be shown if the duration is not an odd multiple of the timestep value.
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