Hydraulic Analysis of the Urban Drain System

Abstract

Analysis efficiency operating drain sewer systems (DSS) is a part of urban water management. Two basic parameters flooding and sediment formation with average annual precipitation and with rains varying intensity are considering. Dealing with hydraulic problems, modelling focus lies on non-pressure systems with two-phase flows. The main requirement in the design of gravity collectors is the flow rate with self-cleaning velocity. The initial data for hydraulics calculation DSS is the flow rate in hole system and geometrical characteristic of the each elements. The average velocity in local tube depends on average flow rate and the cross-sectional area. For calculation, cross-section area needs to estimate depth of flow, which can be find only in situ. The average velocity was found for each element of the system by combining the two matrices. The first contains the initial data of the working collector, and the second contains all possible velocities and depth of the collector with such geometric characteristics. Verification of the proposed model was carried out using data from the standards and from engineering systems in Moscow. Maps with the coordinates of the tube outlet in the considered part of Moscow where the flooded collectors and collectors with sediment were compiled.

Keywords

• storm drain system
• sediment formation
• self-cleaning velocity
• solid particles
• sewerage system