What are the technical requirements for overflow control in urban combined sewer systems

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How to determine the size of pipeline flow?

1、 Volume flow rate: Flow rate expressed in terms of volume/time or volume/time. For example: m3/h, l/h. Volume flow rate (Q)=average flow velocity (v) × pipeline cross-sectional area (A)

2. Mass flow rate: flow rate expressed in mass/time. For example: kg/h. Mass flow rate (M)=Medium density (ρ) × Volume flow rate (Q)=Medium density (ρ) × Average flow velocity (v) × Pipeline cross-sectional area (A)

3. Weight flow rate: Flow rate expressed in force/time. Such as kgf/h. Weight flow rate (G)=medium density (γ) x volume flow rate (Q)=medium density (ρ) x gravitational acceleration (g) x volume flow rate (Q)=gravitational acceleration (g) x mass flow rate (M)

4. Pipeline flow rate:

(1) Flow rate (instantaneous flow rate)=pipe section area x flow rate.

(2) Flow rate (hourly flow rate)=3600 x pipe cross-sectional area x flow velocity. Flow rate (a physical term) refers to the amount of fluid that flows through the effective cross-section of a closed pipeline or open channel per unit time, also known as instantaneous flow rate. When the fluid quantity is expressed in volume, it is called volumetric flow rate; When the fluid quantity is expressed in terms of mass, it is called mass flow control quantity. The volume of fluid flowing through a certain section of pipeline per unit time is called the volumetric flow rate of that cross-section. Abbreviated as traffic, represented by Q. The basic conceptual unit is cubic meters per second, and the equation for flow rate is Q=Sv=constant. (S is the cross-sectional area, v is the water flow velocity) (Q=AV is commonly used in fluid mechanics) When an incompressible fluid flows steadily through

2. What is the second flow rate of drainage design? The drainage design second flow rate refers to the maximum drainage volume considered in the design of urban drainage systems in a short period of time. Specifically, it refers to the maximum flow rate of drainage pipes or rainwater collection facilities within a certain short-term storage period (such as 5 minutes, 10 minutes, etc.). The second flow rate in drainage design is one of the important parameters that must be considered and determined when designing urban drainage systems. For areas with unknown or uncertain drainage data, methods such as rainfall runoff models and computer simulations can be used to determine the design parameters of urban drainage systems, including drainage design flow rate per second. The drainage design flow per second can be used to calculate the standard size of drainage pipes, the capacity of rainwater collection facilities, etc., to ensure that the urban drainage system can work normally for ex

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