Hydrograph

This is a time series of some water charachteristic, usually flowrates, expressed graphically as a series of ordinates, representing the values at different times. Drainage engineers are mainly interested in the peak flowrate and in the volume.

​

• Related Articles

• 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 ...

• Routing (attenuation)

  Hydrological routing is the process of converting a hydrograph that passes through some part of a flow system to allow for the changes that occur during its passage. There are three main types of routing: catchment routing, which converts a rainfall ...

• Calibration

  This is a process by which the outputs from a model are made to match some real, observed data, by altering model parameters that can be used to tune the model. For example, using a Horton (ILSAX) model, pavedand grassed area percentages, depression ...

• 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. ...

• Pop-up (right mouse button) menus

  You can open individual menus for the various system components drawn in the Main Window by clicking the right-hand mouse button while holding the pointer on the component (right-clicking). The menu appears near the component. Examples for a pit and ...