A Calculation Method of Pollutant Concentration in Roof Rainwater Runoff and Its Controlled Release Application
A technology of pollutant concentration and calculation method, applied in the direction of calculation, data processing application, general water supply saving, etc., can solve problems such as large differences, achieve good operability, improve construction efficiency, and improve the effect of sponge city construction in residential communities
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[0036] A method for calculating the pollutant concentration of roof rainwater runoff, the steps are as follows:
[0037] (1) Based on the rain pattern formula issued by City S in 2017 (Formula 1, which conforms to the characteristics of typical Chicago rain patterns), the change law of rainfall in City S in different rainfall recurrence periods is known, and the specific parameter c in the rain pattern formula is extracted = 0.846, b = 7, r = 0.4, and apply this data in subsequent steps;
[0038] When 0
[0039] When 60×r
[0040] Among them, t is the rainfall duration, min; r is the comprehensive rain peak position coefficient; t b is the duration of rainfall before the peak, min; t a is the duration of rainfall after the peak, min; i(t b ) is the instantaneous intensity before the peak, mm / min; i(t a ) is the instantaneous intensity after the peak, mm / min; P is the designed rainstorm return period, a;
[0041] (2) Design the rainfall return period P=1a and the rainfall...
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