21. The normal flow equation is used to relate flow rate to flow area ( or depth ). 22. Most of the fluid flow equations are easily solved by discretizing procedures using the Cartesian coordinate system. 23. A version of the multiphase flow equation that is discretized and used in reservoir simulators is thus 24. Caginalp, Smith and David Porter largely resolved this paradox through the framework of the asset flow equations . 25. An alternative subsurface drainage method is drainage by wells for which groundwater flow equations are also available. 26. For example, the Stokes flow equations . 27. For an extensive list of compressible flow equations , etc ., refer to NACA Report 1135 ( 1953 ). 28. Data-flow analysis is typically path-insensitive, though it is possible to define data-flow equations that yield a path-sensitive analysis. 29. When applied in the flow equations , they should be valid independent of the particular value of " ? ". 30. Dynamic wave routing solves the complete one-dimensional Saint Venant flow equations and therefore produces the most theoretically accurate results.