Proposição de nova metodologia de cálculo e de dimensionamento para sistemas de esgotamento sanitário com a investigação dos parâmetros hidráulicos

Abstract

The methodology for dimensioning sewage collection systems uses the centuryold Manning formula for hydraulic calculations, despite not being worldwide unanimously or dimensionally homogeneous. In addition, the roughness and selfcleansing criteria are based on fixed values that generally do not consider the synergy of the physical and hydraulic parameters in real operational situations: biofilm, sediment, obstacles. Therefore, this work analyzes 168 hydraulic formulas and 133 sediment transport formulas for self-cleansing criteria, in addition to the standards and criteria used, to then mathematically model the existing main formulas and the proposals with 5,105 representative data of the sewage operation, with 312 primary data obtained in experiments carried out in the Urban Water Simulator at UFRJ and in existing systems in the State of Rio de Janeiro (Brazil), with different diameters and materials. After statistical analysis and validation of the proposed models, general and specific formulas are proposed to compose the new calculation methodology and hydraulic design of sanitary collectors, including new methodology and models for self-cleansing criteria and new design criteria for roughness values, under real system operating conditions.