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Topic II. 4. Dry Weather Design Flowrates. Basic Sewage Quantity Parameters I. Domestic Sewage flowrates Specific sewage flowrate - q s , l/d.ca q s = 0,9.q 0 Mean daily sewage flowrate - Q m.d , m 3 /d Q m.d = q s . N/1000 Maximal daily sewage flowrate - Q max.d , m 3 /d

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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

basic sewage quantity parameters
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

basic sewage quantity parameters1
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

sewage design flowrates
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