RESUMO
This paper presents the computational methods used in the unsteady flow models UNET, FEQ, and adICPR. The different results from analyzing infiltration losses for hydrologic models, friction loss methods in water-surface profiles computations, losses at the bridges and culverts, and the use of hydraulic grade line and energy grade line computations in storm sewer analysis are discussed. Consistent computational methods should be established so that the results will be the same no matter which computer program is used for a particular type of flow. FEMA is responsible for publishing flood insurance rate maps for the entire nation. The maps and profiles are based on the results obtained from computer models, and it is important that consistent methods are used in the computer programs to produce consistent results. A unified computer program agreed upon by the hydraulic community may be the best solution to the consistency problem, but is unrealistic. Another solution to the consistency problem is to set specific guidelines for flood insurance mapping and require that the computer programs comply with these guidelines