# This eight years (GRWA) from 2009 to

This method was built depended on multiplying the expected
population number for the specific year by the average of municipality solid
waste generation rate for the last eight years (GRWA) from 2009 to 2016 as a
fixed value. The average municipality solid waste generated was determined
through dividing the average quantity of municipality solid waste (Qs) for years
2009-2016 by the average population (P) for years (2009-2016) of Sulaymaniyah
city using Eq. (3.8):

GRWA=

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Where:

GRWA:
Average generation rate of municipality solid waste kg / (capita. day).

Qs(av.):
Average quantity of municipality solid waste for years (2009-2016) (kg).

P(av.):
Average Population of Sulaymaniyah city for years (2009-2016).

Eq. (3.9) (Jarabi, 2015; United Nations, 1952) was used to determine
the population for each year from 2016 until 2032.

Where:

Pt:
Future population at the end of period.

Po:
Present population for year 2016.

r:
The annual population growth rate (2.99 %)

t:
Number of years

Eq. (3.10) was used to find the produced solid waste quantity
for year 2032. Using an average waste generation rate for the years 2009-2016
then:

Qs:
Quantity of municipality solid waste produced each year (ton).

The cumulative of municipality solid waste quantity generated in 2032 can be determined,
as shown in Eq. (3.11):

Where:

Qs (c):
Cumulative quantity of municipality solid waste for the specific year (tonne).

Qs (ct): Quantity
of municipality solid waste for the specific year (tonne).

Qs
(ct-1): Cumulative quantity of municipality solid waste for the last year
before specific year (tonne). In order to calculate the cumulative municipality
solid waste generated by year 2032

For illustration the cumulative municipality solid waste quantity
in 2032 Qs(c) is equal to the municipality solid waste quantity of produced in
2032 Qs (ct) using Eq. (3.10) plus the cumulative municipality solid waste quantity
in 2031 Qs(nt-1) form the year 2016.

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