| Author | Wichan Kawinpoomstan |
| Call Number | AIT Thesis no.WM-97-22 |
| Subject(s) | Flood damage prevention--Yom River Basin (Thailand)
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | One of the objectives of flood risk mapping is to provide information concerning flood
risk areas to residents and authorities concerned in flood prone areas and to establish flood
protection system and evacuation. If residents and people in charge of flood loss prevention
understand the susceptibility of flooding correctly, flood loss prevention measures of a locality
would be smoothly developed and the measures could minimize the damages.
According to the Manual and Guidelines for Flood Risk Analysis and Mapping
(ESCAP,1988), the approaches to flood risk analysis and mapping are classified into three
types. The first is the geomorphological approach in which the flood risk is evaluated on the
basis of geomorphological units such as natural levees and old river course which indicate
flood susceptibility. The second is the past flood approach in which the flood risk is evaluated
on the basis of the inundation data of past floods . The third is the hydrological and hydraulic
approach in which hydrological and hydraulic models are used for obtaining the inundation
areas, depth and duration. Each approach has advantages and disadvantages and thus the most
suitable approach should be selected in consideration of objectives, condition of the area,
available data, and other requirements.
The Yorn Basin represents one of the most serious flood problem in Thailand. In order
to reduce flooding in the natural hazards caused by flooding, the flood risk map of Y om Basin
is developed. In this study, the flood risk map is developed based on hydrological and
hydraulic approach. The return periods of rainfall used in mapping are 2-yr., 5-yr., 10-yr., 25-
yr.,50-yr. and 100-yr. Due to the limitation of time and available data, the flood risk maps are
developed specifically at the two most importance residential areas on the Y om Basin namely:
the Plu·ae flood plain area and Sukhothai flood plain area.
The Phrae area is a wide drainage area lying on both sides near the Y om river. The
ground on both sides rather comparatively steeply. It was found that the flooding area is only
near to the river and located along in the banks of the left and right main canals of Y om
Irrigation Project.
The Sukhothai area is a large flood storage area. When the river overspills, the water
spills over the river banks and passes tlll'ough the flood plain channels into the low lying areas
in the flood plain.
The flood risk maps provide a vary useful information on the inundated areas under
deferent design floods and hence they can be used for flood control and planning purposes. |
| Year | 1998 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Tawatchai Tingsanchali; |
| Examination Committee(s) | Gupta, Ashim Das;Sutat Weesakul ; |
| Scholarship Donor(s) | Royal Thai Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |