Transcript Topic II. 4. Dry Weather Design Flowrates

Topic II. 4. Dry Weather Design Flowrates
Basic Sewage Quantity Parameters
I. Domestic Sewage flowrates
 Specific sewage flowrate - qs, l/d.ca
qs = 0,9.q0
 Mean daily sewage flowrate - Qm.d, m3/d
Qm.d = qs.N/1000
 Maximal daily sewage flowrate - Qmax.d, m3/d
Qmax.d = qs.N.Kh/1000
Kh - coefficient of hourly variability
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Basic Sewage Quantity Parameters
 Maximal hourly sewage flowrate - Qmax.h, m3/h
Qmax.h = qs.N.K0/24.1000
where
K0 = 1 + 2,5/ (Qm.d)0,22 ; Qm.d - in l/s
K0 - maximal coefficient of general variability
 Sewage flowrate module - qm , l/s.ha
qm = (Qm.d -  Qs,conc) / F.86400
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Basic Sewage Quantity Parameters
II. Industrial Sewage Flowrates
 Mean daily sewage flowrate - Qm.d, m3/d
Qm.d = qind.Md/1000
 Maximal hourly sewage flowrate - Qmax.d, m3/h
Qmax.h = qind.Mh.Kh/1000
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Sewage Design Flowrates
Separate Sewer System
(Dry Weather Flow)
 Sewage design flowrate - Qd, l/s
Qd = 2Qmax,h = 2(qm.f.K0 +  Qs,conc +  Qmax.h)
where
K0 = 1 + 2,5/(qm.f)0,22
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