**RATIONALE**
This program calculates a series of ten (10) dimensionless unit hydrographs by the cascade of linear reservoirs,
given a Courant number C (C = t_{r}/ K).

The value t_{r} is the unit hydrograph duration, in hours.
The value K is the reservoir storage constant, in hours.

Dimensionless unit hydrographs are calculated for N, the number of linear reservoirs, varying between N = 1 to N = 10.

The recommended range of input Courant number is: 0.1 ≤ C ≤ 2. An input
value outside of this range will trigger an error message and stop execution.

The dimensionless unit hydrograph has dimensionless time t_{*} as abscissa and dimensionless discharge Q_{*} as ordinate.

The dimensionless time is t_{*} = t / t_{r}, in which t_{r} is the duration of the unit hydrograph, in hours.

The dimensionless discharge is Q_{*} = Q / Q_{m}, in which Q_{m} = 2.777778 (A / t_{r}), is the maximum attainable discharge
(runoff concentration only), in m^{3}/s.
In this formula, basin area A is in km^{2}.