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1. Field of the Invention This invention relates generally to computer-based modeling of gravity hydraulic network systems and, more particularly, to techniques for a representation of flow data within such systems. 2. Background Information Computer-based modeling solutions for simulating the complete hydrodynamic response of pipe hydraulic network systems, such as those encountered in storm water and sanitary sewer collection systems are useful in the design, rehabilitation and simulation of such systems. The software, which performs the functions that describe the water distribution network, is often referred to as an hydraulic network solver or hydrodynamic solver (often commonly referred to generally as a “solver”). The solver is a computer program that simulates and predicts water pipe flows, hydraulic pressure conditions, run-off water, storm conditions and flooding conditions. In a network of pipes, the conditions can be described for the links (the pipes) and the nodes (the junctions) in such a system. There are a number of available software products that embody hydraulic network solvers and that provide general-purpose modeling. The solvers, inter alia, compute and provide hydraulic solutions for complex differential equations. More specifically, computer-based modeling solutions for simulating the complete hydrodynamic response of hydraulic network systems, such as those encountered in storm water and sanitary sewer collection systems, are typically implemented employing numerical techniques for solving St. Venant equations. Frequently, solutions are obtained by iteratively solving a simultaneous system of equations governing the implicit solution of a finite-difference scheme that describes variation of flow over a mathematical grid of time and one dimension space. These equations that govern the system-wide hydraulic response are non-linear and are most often solved using Newton-Raphson numerical matrix-based solvers. The matrix is typically comprised of a set of equations that each describe a point on the mathematical grid. The results produced may include a family of hydraulic delivery curves that describe various aspects of a storm water and sanitary system. In practice, it is quite difficult to implement a general modeling solution that exhibits accuracy and robustness over the entire range of flow conditions (and over the transitions that occur between these flow conditions) that are of interest to the engineering modeler. For example, in man-made hydraulic networks, flows diverge at junctions or man-made diversions and then outfall from the system entirely or split off and then return to converge again with the system at some down stream location. These transitions are difficult to model and it is difficult to thus provide hydraulic response curves for such aspects of the system. Other examples of transitions include those occurring when flows transition between dry-bed to free surface, or from gravity flow to pressurized flow, or from steeply sloped channels to mildly sloped, or flat, or adversely sloped, channels. In addition, a transition can occur from pipe to manhole to ditch to culvert. Each of these flow conditions, flow transitions and hydraulic situations needs to be described by a different set of governing equations. Successfully employing conventional numerical techniques with the variety of mathematical formulations that describe