Topic II. 4. Dry Weather Design Flowrates - PowerPoint PPT Presentation

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Topic II. 4. Dry Weather Design Flowrates

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Topic II. 4. Dry Weather Design Flowrates
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Topic II. 4. Dry Weather Design Flowrates

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  1. 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

  2. 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

  3. 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

  4. 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