Hyetograph

Hyetograph

This defines a rainfall pattern, usually shown as a block diagram. Rainfall is presented in blocks because depths are accumulated over a time period, rather than being measured at a particular time, like streamflows or water levels, which are usually presented as continuous plots.

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    • Initial loss

      This is a hydrological loss that occurs at the start of a storm event. It is expressed in mm and is subtracted from the beginning of a hyetograph by adjusting the rainfall values. Initial losses are an important feature of IL-CL (initial loss - ...

    • Time-area method

      This is a form of catchment routing model in which a hyetograph of rainfall is combined with a time-area diagram to produce a flow hydrograph. All of these must use the same time step, Dt. The procedure effectively divides a catchment into a number ...

    • Rainfall-runoff model

      This is a hydrological model that converts rainfall precipitat ion inputs, usually in the form of a hyetograph, into runoff or streamflow values. Such models are usually in two parts – a loss model, followed by a routing model. Rainfall-runoff models ...

    • Inflow Hydrograph (user-provided hydrograph) property sheet

      This window enables you to enter a user-provided hydrograph at a pit. You have a choice of applying this above the inlet at the surface, or inside the pit. You need to specify the duration of this hydrograph and the time step between ordinates. This ...

    • Lag time (Lag factor)

      In hydrology, catchment lag or delay has a general meaning, as the time taken for runoff in general to flow off a catchment to its outlet. It relates to the time difference between the centroids of the rainfall hyetograph and the runoff hydrograph. ...