New approaches to hydraulic calculations of pipeline of water disposal networks based on simplified formulas

Abstract

Abstract. The expediency and critical conditions of conducting hydraulic calculations of drainage pipelines according to simplified power-law formulas have been determined. The main interrelationships between structural and kinematic parameters of drainage pipelines when performing their hydraulic calculations using simplified formulas are analyzed. Numerical values of coefficients and exponents in simplified formulas for pipelines made of different materials were obtained. It was established that for all types of urban drainage (domestic, rainwater and combined), the values of the minimum allowable slopes of the pipelines practically coincide, depend only on their diameters and can be calculated according to the obtained empirical formula with the recommended numerical values of its parameters for pipes of different materials. The maximum allowable of minimum and maximum slopes, as well as the corresponding maximum waste water consumption for pipelines of different diameters and materials, are determined.
 New approaches to hydraulic calculations of water drainage networks involves their execution according to a single methodology based on the proposed simplified formulas. Also, it involves the use of the obtained empirical dependencies to determine the minimum and maximum permissible slopes and the corresponding maximum marginal flows of wastewater and pipe diameters. The algorithm for the unification of hydraulic calculations when solving the optimization problem is considered. The effectiveness of the application of simplified power-law formulas of hydraulic calculations and empirical dependencies obtained on their basis for unification is shown. Carrying out hydraulic calculations of drainage pipelines using simplified power-law formulas allows not only to simplify the calculations themselves, but also to obtain additional dependencies between the structural parameters of the pipelines based on them.