A hydrograph describes the runoff response of a catchment or watershed to rainfall. It shows the runoff rate Q (or flow or discharge) as a function of time t resulting from a given excess rainfall (expressed as a depth P) for a storm of a specified duration. A unit hydrograph results from unit excess rainfall (e.g., P = 1 cm).
Write a function to determine whether a hydrograph is a unit hydrograph. Inputs to the function will be time t in minutes, the flow rate Q in m^3/s, and the catchment area A in m^2. Allow for a tolerance of 0.01 cm in the excess rainfall depth.
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