The Nash model for Instantaneous Unit Hydrograph (IUH) represents the catchment as:
Choose the correct answer
A single linear reservoir
n identical linear reservoirs in series, with IUH: u(t) = [1/(K x Gamma(n))] x (t/K)^(n-1) x exp(-t/K)
A non-linear storage function
A series of parallel channels
Correct Answer
B. n identical linear reservoirs in series, with IUH: u(t) = [1/(K x Gamma(n))] x (t/K)^(n-1) x exp(-t/K)
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Nash IUH: u(t) = (1/K x Gamma(n)) x (t/K)^(n-1) x exp(-t/K), where n = number of cascaded linear reservoirs, K = storage constant for each reservoir. Parameters n and K are estimated from observed flood hydrograph moments (first and second moments). Applied in flood forecasting using convolution integral.
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