The volumes of wastewater
Design basis
Oyear
~
1 xN
Oyear,pers
X _1 _ __.. Qh max
X 36~
th
L__'----:-+--=-=:~
1
t X fh,max
X M -----.. Q~av
fh,min
•
ah,min
Fig 1.6
Calculation of volumes of domestic wastewater.
18
Households
Qyr
Qyr,pers
Qd,av
Qh,max
Qs,max
Qh,min
N
fh,d
!h,max
fh,min
Qyr,pers
fh,max
50-100 m 3 /(person · yr) (see Table 1.2)
{
14-18large towns
10-14 small towns
{
1.3-l.llarge towns
1.7-2.4small towns
fh,min
= 0.2-0.4
annual volume of wastewater, dry weather
annual volume of wastewater per person
av. volume of wastewater per day over the year, dry
weather
av. volume of wastewater per hour over the year, dry
weather
av. of maximum hours during the days of the year,
dry weather
av. volume of water per second in an av. maximum
hour, dry weather
av. of minimum hours during the days of the year,
dry weather
number of persons
hourly factor
max. hourly constant
min. hourly constant
h/d