Initial loss

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 - continuing loss) models and storage routing models in DRAINS.


    • Related Articles

    • Loss model

      In rainfall-runoff modelling, loss models are methods or procedures that determine the 'losses' from rainfall that do not contribute to runoff. They are abstractions from the rainfall, producing rainfall excess, equal to rainfall minus losses. The ...
    • ARR 2019 Initial loss - Continuing loss (IL-CL) hydrological model

      The IL-CL hydrology procedure in DRAINS is an alternative to Horton (ILSAX). Both methods are accepted in the ARR 2019 guidelines and discussed in Book 5 Chapter 3. The IL-CL model and its parameters are set out in Section 3.5.3 of ARR 2019. ARR 2019 ...
    • Head loss

      This is the loss of energy or head (height of water expressing energy per unit weight) occurring in a pipe or channel carrying flows of water. The loss is caused by friction between the water and the conduit’s walls and within the flow, and by ...
    • ARR Data Hub

      Before constructing a DRAINS model, users will need to obtain data for a location from the ARR Data Hub and the BOM website, starting with the Data Hub (data.arr-software.org). After obtaining the necessary data it can then be inputted into DRAINS ...
    • ARR87 example at Penrith, run with 2016 IFD rainfall inputs and ARR design procedures

      The file for this example is Penrith ARR87 Example - Lite.drn, located in the folder C:\ProgramData\Drains among the Lite examples. If this folder is hidden, in File Explorer select the View tab and tick the Show Hidden Items box to make it visible. ...