The current version of HEC-SSP allows the user to compute balanced hydrographs. In this type of analysis, observed data, flow, and volume-frequency curves are used to create a hypothetical hydrograph that "balances" flow rates, volumes, and frequency. Within a balanced hydrograph, the flow and/or volume across multiple durations satisfies the relation between flow/volume and duration for a given frequency. For example, a 5-day 0.2 percent annual chance exceedance (ACE) balanced hydrograph would have individual hydrograph ordinates arranged in such a way that the flow volumes for the 1-hr, 1-day, …, 5-day durations would each equal the 0.2 percent ACE flow rates and/or volumes. Although such hydrographs do not necessarily preserve the random character of natural hydrographs, use of balanced hydrographs ensures an appropriate flow rate and/or volume (in terms of frequency), regardless of the characteristics of a particular watershed or location.
Examples of this type of analysis can be found here:
