So far the Keelung River only reaches the initial protection criteria of the 10-year flood frequency, and has not reached the protection standard for the peak flood flow rate in the original plan. In recent years, typhoons often caused floods in the depression areas of Sijhih, Rueifang and Keelung. Using block flood-mitigation method for the aforementioned areas, the Water Resources Agency, MOEA, has planned to integrate the block’s related constructions, such as dike construction, drainage improvement of branches, bridges improvement, and gaps provisional measures, etc. for coordinated execution. The set up of the flood control zones will protect 713 hectares of areas in Taipei County and 316 hectares of areas in Keelung County. Its budget totals about 23.4 billion NT dollars, including about NT$14.1 billion for river dikes construction in the depression areas, about NT$2.4 billion for branches drainage improvement, about NT$4.5 billion for construction and maintenance of pumping stations, and about NT$0.8 billion for bridges improvement.
The flood-control zones project is divided into 11 blocks of construction. To reach the 200-year flood mitigation criteria after the completion of flood diversion, our office coordinates with other river management offices to execute the project. It is estimated to finish the main construction between June and September of 2004.
The following chart shows the blocks and their respective management offices.
◆ Chart of the Zones and the Respective Management Offices
[Chart of the Zones and the Respective Management Offices]
| Order |
Flood-mitigation Block |
Range of Protection |
Area
(hectares) |
Responsible Unit of the Water Resources Agency |
|
One
|
Ciaodong |
From the downstream of Baochangkeng River outlet on the west bank of Keelung River to the upstream area of the Highway No.3 Bridge |
190
|
The Tenth River Management Office |
| Ciaodong |
From Chang-an Bridge downstream, east bank of Keelung River, to the downstream of Beigang River outle |
90
|
The First River Management Office |
| Dingnei |
From Cukeng River outlet on the Rueiching Bridge upstream, west bank of Keelung River, to the upstream of Dingnei Railway Bridge |
32
|
The Eighth River Management Office |
|
Two
|
Siangjhang |
Keelung River from the Sijhih tollbooth to the east bank of Ciansiang Bridge |
76
|
The Sixth River Management Office |
| Baifu |
Keelung River from Wufu Bridge to the east and west banks of Ciansiang Bridge |
82
|
The Tenth River Management Office |
| Lioudu |
Keelung River from Liouhe Bridge to the west bank of Wufu Bridge |
80
|
The Tenth River Management Office |
| Cidu |
Keelung River from Dahua Bridge to the west bank of Liouhe Bridge |
64
|
The Ninth River Management Office |
| Dahua |
Keelung River from Dahua Bridge to the east bank of Liouhe Bridge |
20
|
The Second River Management Office |
|
Three
|
Beishan |
Keelung River from Neigou River west bank to the east bank of Highway No.4 Bridge |
192
|
The Seventh River Management Office |
| Jhangshu |
Keelung River from Beishan Grand Bridge to thewest bank of Highway No.4 Bridge |
107
|
The Fifth River Management Office |
| Rueifang |
From Houtong Jieshou Bridge to the junction of Rueifang and Keelung City |
96
|
The Tenth River Management Office |
The Area of each flood-mitigation block is illustrated in the following diagrams: (a) and (b).