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Modeling receding limb of hydrograph

  • Sep 30 2021
  • adrmart

I’m having some issues in Nays2DFlood modeling the receding limb of a hydrograph: the floodwaters never seem to recede despite the discharge and water surface elevation going down. Could there be a reason for this? I’ve tried extending the time steps out and the floodwaters never decrease from their max.


  1. inoue-t says:

    I think that Depth(max) is probably drawn. Please draw Depth. The other possibility is the effect of backwater of the downstream water level. Check if the water level downstream remains high.

  2. pritikumaricetpa says:

    Exponential Decay Model: This model assumes that the rate of change of flow with time during the recession period is proportional to the remaining flow. This model can be represented mathematically as Q = Q0 * exp(-kt), where Q is the flow at time t, Q0 is the initial flow at the start of the recession, k is the decay constant, and t is the time since the peak flow.

    Muskingum-Cunge Method: This is a routing method that uses a storage unit to represent the delay of flow along the river channel. It is based on the principle that the flow at any given point is a combination of the inflow, outflow, and the storage volume. The method requires estimation of parameters such as the storage coefficient, the routing coefficient, and the time of concentration.if you’re looking to improve your coding skills or learn new technologies, Cetpa Infotech offers a range of courses and training programs to help you stay up to date with the latest developments in the field. Check out our website for more information.


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