Estimating the amount ofDMW
Yuzuru Kushiyama(JSMCWM)

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Estimating the amount of DMWTable of Contents（１）How to estimate disaster waste generation?
（２）Alternative method and data（３）Case study of prompt estimation
for disaster waste

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(1)How to estimate disaster waste generation?
Estimated Amount of DW（t）= ∑Number of Damaged Buildings ×DW Generation Intensity
Number of damaged buildings is counted by field survey.

DW Generation Intensity= Floor Space(m2) ×Weight per unit space （t/m2）
DW generation intensity is derived from the result of disposal datain the past disaster.(See next table)

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(1)How to estimate disaster waste generation?
Table1

Waste generation per unit for demolished buildings in the past researches
WoodenOrganisation

Others(RC , Steel etc.)

t/100m2t/m2

t/100m2

t/m2

Kumamoto

51.6

0.516

150

1.5

Tokyo Metro.

31.3

0.313

94.3

0.943

Hyogo Pref.

57.1

0.571

137

1.37

Kawasaki City

50

0.5

133

1.33

Journal of the Japan Society ofWaste Management Experts

62~71

0.62~0.71

85

0.85

DWM guideline of MOEJ

69.6

0.696

110.7

1.107

Average60

0.6120

1.2

Table2

Waste generation on flood disaster
Furniture and electric items etc. affected by flood

DWM guideline of MOEJ
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2 (t/building)4

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(1)How to estimate disaster waste generation?
Table3

Waste per unit researched in the existing papers in the Asian countries
WoodenStone/BrickOthers(RC, CB etc.)

t/m2

t/m2

t/m2

Japan

0.6

NA

1.2

Indonesia[1]

0.08

0.736

0.817

StudyNepal:
Other countries

1.90 ~ 3.23[2]The weight and unit intensity of disaster waste generation in othercountry should be researched

References[1]: UNEP, Disaster WasteManageMent Mechanism.
[2]: Raju Poudel, Yasuhiro Hirai, Misuzu Asari, Shin-ichi Sakai: Establishment of unit
generation rates of building debris in Kathmandu Valley, Nepal, after the Gorkha
earthquake, Journal of Material Cycles and Waste Management (July 2018), Volume 20,Issue 3, pp 1663–1675.
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(1)How to estimate disaster waste generation?
DW generation Intensity= Floor space(m2) ×Weight per unit space （t/m2）
Average space per house is nearly 100m2. It is based on the statistics.
DW generation intensity of wooden building/house is calculated as below.
ex. 100m2×0.6t/m2＝ 60 t/building

Estimated Amount of DW（t）= Number of Damaged Buildings ×DW Generation Intensity
If we estimate the number of damaged buildings is 1000 buildings
after field survey, Estimated Amount of DW（t）is calculated as below.
ex. 1000 buildings×60t/building＝ 60,000 t

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(2)Alternative method and data
Estimated Amount of DW（t）= Number of Damaged Buildings ×DW Generation Intensity…Eq. 1

Number of damaged buildings is counted by field survey.
But it needs lots of human resource and time for the field survey.
We propose alternative method of the prompt estimation
for damaged buildings.

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(2)Alternative method and data
Number of Damaged Buildings= Density of buildings per sq. km × Damage area extent (sq. km)…Eq. 2We try to estimate Number of Damaged Buildings
from the following two parameters.
Density of buildings per sq. km…Eq. 3=Population Density ÷number of person per dwell(persons/building)Affected area extent
by drawing with a reference of satellite image analysis or making ascenario.

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(3) Case study of the prompt estimation for disaster waste【Preparation before case study】
・Using browser at URL of world bankhttps://climateknowledgeportal.worldbank.org/country/indonesia/vulnerability

Scroll down in the vulnerability tab

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(3) Case study of the prompt estimation for disaster waste
Population density
We can find population distribution and disaster history data
in database published by the World Bank

Fig. Population and cyclones tracks around Micronesia Is. Fig. Population density and cyclones tracks around Indonesia
Source: https://climateknowledgeportal.worldbank.org/region/asia/climate-data-historical

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(3) Case study of the prompt estimation for disaster waste
Population density
We can find the population density map in website created by World Bank.

https://climateknowledgeportal.worldbank.org/country/indonesia/vulnerability

Eq. 3

Approximate 2500 persons per sq. km

Ex. Density of buildings per sq. km = population density ÷4(persons/building)11
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(3) Case study of the prompt estimation for disaster waste【Preparation before case study】
・Download, install, and launch “Google Earth Pro”
https://www.google.com/earth/download/gep/agree.html?hl=en-GB
3
1

2
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(3) Case study of the prompt estimation for disaster waste
Affected area extent
We can find damage map such as UNOSAT satellite image analysis and so on.

Fig. Damage map in Banda Ache area by Tsunami analyzed by UNOSAT.
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(3) Case study of the prompt estimation for disaster waste
Affected area extent
It is able to measure the area by using Google Earth Pro.
with referring disaster map of UNOSAT
Launch “Google Earth Pro” and set place name.

Banda Ache14
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(3) Case study of the prompt estimation for disaster waste
Affected area extent
See “Area(sq. km)” of “Measurement”
Right Click on
the polygon
AndOpenProperty

Area/Work name15
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(3) Case study of the prompt estimation for disaster waste
Prompt estimation for disaster waste generation
Eq.3 Density of buildings= Population density(km2) ÷ Persons per building= 2500 ÷ 4 = 625 (buildings/km2 )Eq.2 Number of Damaged Buildings= Density of buildings per sq. km × Area of Damaged (sq. km)= 625 × 18
= 11250 (buildings)
DW Generation Intensity = 0.73 × 100m2 = 73 (ton/building)(DW Generation Intensity is derived from table 2)
Eq.1 Estimated Amount of DW= Number of Damaged Buildings ×DW Generation Intensity= 11250 × 73
=821200 (ton)16
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(3) Case study of the prompt estimation for disaster waste
Please consider a scenario of affected area and estimate the numbers by the tools(From World Bank population map)
Eq.3 Density of buildings= Population density(km2) ÷ Persons per building=
÷ 4=(buildings/km2 )Eq.2 Number of Damaged Buildings (From Google Earth Pro)
= Density of buildings per sq. km × Area of Damaged (sq. km)=×(sq. km)=(buildings)
Eq.1 Estimated Amount of DW= Number of Damaged Buildings ×DW Generation Intensity=×(ton/buildings)
60 ton/building (earthquake)*1=(ton)
2 ton/building (flood)*2*1: Average of past research for 100 sq. meter in table 1*2: Disaster waste technical guideline for flood of MOEJ
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Thank you for your attention.
We appreciate if you find related information from the web site below.

https://jsmcwm.or.jp/international/?page_id=2187

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