Flood Hazard Mapping Progress Report

South and southeast Asia Regional Seminar onFlood Hazard MappingFeb.17, 2009
Ms. Xu Jing
The office of state flood control and drought relief headquarters
Ministry of water resources
E-mail: xujing@mwr.gov.cn
Tel:+86--10
Tel:+8610--63202485
Fax:+86Fax:+86-10
10--63202483

Content:• General introduction on flood related
disasters in 2008

• Outline of current FHM situation in China• Problems of FHM• Work plan

Feb. 17, 20091

General introduction on flood related disasterin 2008
• Disasters occur frequently in 2008.
• In January, severe iceice-snow and frost disaster occurred insouth China. More than 20 provinces suffered this disaster.
Large masses of power facilities, communication facilities,
traffic infrastructures and forests were destroyed.
• Economic losses were hard to evaluate.

Feb. 17, 2009

General introduction on flood related disasters
in 2008• On May the 12th, a 8.0 magnitude earthquake hit Sichuanprovince in southwestern China. More than 88,000 people
died or missing, 375,000 people injured. This is the biggest
earthquake occurred in China since 1976.

Feb. 17, 20092

General introduction on flood related disasters
in 2008• From April to October, 10 tropical cyclones including typhoons hit•

China coastal areas. Altogether 127 people died, 52 people were
missing and the economic losses were about 4.6 billion US dollars.
Some rivers were blocked because the landslides and formed many“lakeslakes”” with unsteady dams. It took us many time and labor torelease these dangers to downstream residents.

Feb. 17, 2009

General introduction on flood related disasterin 2008• Table of tropical cyclone losses
Serialnumberame

Affectedpeople(10^5)

Dead（person）

Missing（person））

Collapsebuilding(10^5)

Economic
Losses（billionCY））

0801

Neoguri

202.3

318

0

0.789

0806

Fengshen

193.01

35

12

2.12

2.667

0807

Kalmaegi

87.75

70

0.52

0.799

0808

Fungwong

968.88

154

3.61

7.795

0809

Kammuri

561.60

31

6

2.06

1.983

0812

Nuri

150.80000.284.29

0813

Sinlaku

65.30

0000.1400814

Hagupit1501.95

35124.13

13.3300815

Changmi5.60

0000.1940817

Higos
合计54.37

1000.088

3791.56

12752

12.72

320.75
Feb. 17, 2009

3General introduction on flood related disasters
in 2008• The frequently occurred flood related disasters in 2008
retained some of our basic research works including FHM.

Feb. 17, 2009

Outline of current FHM situation• FHM responsible organization system.
– At state level, the responsible organization is the officeof state flood control and drought relief headquarters(OSFCH), which is a department of the Ministry ofWater Resources (MWR).
– At province and local government level, the office offlood control and drought relief headquarters at eachlevel is the responsible organization.
– IWHR (China Institution of Water resources andHydropower Research), colleges and institution of water
resources at province level form the technicalsupporting organization system.

Feb. 17, 20094

Outline of current FHM situation• FHM is necessary for China to carry out flood risk
management. In 2004, the OSFCH carried out FHM pilot
works.
• General guideline of FHM in China is to carry out pilot
works firstly before to carry out through whole country.
• Pilot works can be divided into two stages:– First pilot stage is from 2004 to 2007.
– Second pilot stage is from 2008 to 2010.
– Now the first stage of pilot work has been finished and thesecond stage of pilot work is still going on.

Feb. 17, 2009

Outline of current FHM situation• Outcomes of first stage:– ThirtyThirty-six pilot areas include 12 sections of important
river dikes, 9 cities, 9 flood detention areas and 6
reservoirs. Those pilot areas are in seven major riverbasins.
– More than 300 flood hazard maps were finished.
– Most maps are of type E( past inundation area based onsimulation) or type F( inundation area of the designflood ).

Feb. 17, 20095

Outline of current FHM situation• Outcomes of first stage:– Seven flood hazard map management systems were setup.

Feb. 17, 2009

Outline of current FHM situation• Outcomes of first stage:– Two technical files were issued to the pilot areas toguide and coach this work.
– One is the file to carry out FHM pilot works in pilot
areas and the other one is to standardize pilot works.

Feb. 17, 20096

Outline of current FHM situation• Outcomes of first stage:– Two training seminars were held in JiangSu province.
– Two technical checkups were held in ShangHai andChangChun.

Feb. 17, 2009

FHM practices• FHM for WenZhou city.
Flood inundation map based on simulation for once in 50 years
flood• Wenzhou city is
located in zhejiang
province insoutheast China.
Rural area
population is 0.8
million. Rural area
is 1,082 km^2. It
is the economicand cultural centerfor south ZheJiang
provinces.

Feb. 17, 20097

• Wenzhou city is located in zhejiang province in southeast China.

•Rural area population is 0.8 million. Rural area is 1,082 km^2.
It is the economic and cultural center for south ZheJiang
province.
TY Feria (0505) caused 11 people died or missing and about
1.05 billion US dollar economic losses. It is the strongest
typhoon that affected Wenzhou since 9417 typhoon.
Flood inundation map based on simulation for past flood caused by0505 typhoon Haitang (or Feria).

••••

Land FuJian provinceand Lianjiang city on
July 17,2005.
10 grade wind lastmore than 40 hours.
Average rainfall forWenzhou city is over300mm.
Deepest water depth
is over 2 meters inrural area.

Feb. 17, 2009

FHM practices• FHM for Shanghai city:– On August 25, 2008, a heavy rain hit Shanghai city. In
some observation sites maximum hourly rainfall are over
118 mm which is once in 100 years.
– More than 100 main roads and streets were flooded withwater depth over 30 cm in downtown area. More than
11,000 living houses were flooded.

Feb. 17, 20098FHM practices• FHM for Shanghai city
• Inundation map based on simulation on 8.25 heavy
rainfall.

Feb. 17, 2009

FHM practices• FHM for ChengDu city.

Feb. 17, 2009

9

FHM problems• Problems on situation:• Absence of FHMFHM-related law result in many problems:– To local government, we can’can’t clarify there obligation on
making FHM.
– To the related departments, we have no access to data andfinance .
– To the public, we have no measures to maintenance FHMsauthority.

• Problems on making FHM:
– FHM
FHM--related data was hard to acquire.
– Focusing more attention on simulation and calculation。
calculation。
More type E or type F FHM than type D FHM which costmore time or labor than former.
– Lack local communities’communities’ participance.

Feb. 17, 2009

Thank you !

Feb. 17, 200910