Wastewater, Volumes and Composition
Oyea
X - 1 - _______. od,av
td
X 1 •
3600
Fig 1.7
Calculation of wastewaters from industry and institutions.
Qyr
th,yr
Industry and institutions th,d
fh,max
fh,min
most variable (see Tables 1.3 and 1.4)
100-365 (typical225-275)
4-24 (typical 6-8)
1-6 (typical3-4)
0.1-0.2
Qyr
annual volume of wastewater, dry weather
m 3 !yr
Qd,av
av. volume of wastewater per day over the year, dry
m 3 /d
weather
Qh,av
av. volume of wastewater per hour over the year, dry
m 3 /d
weather
Qh,max
av. of maximum hours during the days of the year,
m3/h
dry weather
Qs,max
av. volume of wastewater per second in an av. maxim%
mum hour, dry weather
Qs,av
av. volume of wastewater per second in an av. hour
m%
over the year
Qh,min
av. of minimum hours during the days of the year,
m3/h
dry weather
td,yr
diurnal factor
dlyr
th,d
hourly factor
hid
fh,max
max. hourly constant
fh,min
min. hourly constant
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