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How do you calculate Dry Weather Flow for Assimilation Capacity of a River?

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  • 08-07-2014 11:27am
    #1
    YoungLooney
    Registered Users Posts: 4 ✭


    Hi,
    I have been trying to find out how to determine the dry weather flow from a river flow dataset. I thought from some reading that this was the same as the 98th percentile flow of the river but I am not sure this is correct.

    I would be grateful if anyone could correct me.

    Thanks
    Tagged:


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    #2
    Thomasofmel
    Registered Users Posts: 429 ✭✭Thomasofmel


    The Dry Weather Flow (DWF) is defined as the annual minimum daily mean flow rate with a return period of 50 years. The DWF is a statistical measure of low flow and usually requires reliable long term low flow data or sufficient information that would allow the estimation of the DWF. It should normally be based on long term records of flow data. In the absence of processed flow data, it is not possible to use the records to calculate a dry weather flow and, in their absence, recourse has been made to best estimates based on measured flows.

    Investigations of low flow data indicate that in large areas of the country, the return period of the 1976 drought had a return period of about 50 years.


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