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Figure 2. Front view of a proposed new dam 
superimposed with a river cross profile. 
    
    
   
CA-30141  &L 
FA-16.08 ~ 0.5 
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: 10.8 
1.7 1.34 28 1.5 
     
  
  
  
  
Figure 3. A cross section at a given direction. 
A designer has to insert a new drawing file into its 
proposed site on the digital terrain model. Then, figure 
2 wil be generated for calculations of cutting and 
banking. Figure 3 shows a cross section at a given 
direction. These given directions can be defined in 
advance. Cutting and banking calculations at a cross 
section require a designer to make a polygon in a close 
form. It is not user friendly but is very easy. 
Solid models of the proposed site along the river has 
been made. All solid models are suitable shown in 
colors. Animation of the proposed new dam and its site 
are also produced. It is better shown on a color monitor 
or a VCR. Animation of two same types of dam along 
the river is also performed to see what if a second dam 
is quired. 
Budget compilation of a new dam is also performed by 
a word processor in an all Chinese mode. Paper work 
was performed semi-automatically. Picking items and 
filling tables are two procedures needed for all paper 
work. 
GIS analysis was reviewed by overlay associated maps 
in the existing data base. It is very simply because all 
maps and drawings have a common coordinate system. 
712 
4. CONCLUSION 
Soil and water conservation engineering usually can be 
catergorized into several types. This paper only 
discussed one type of dam at Taipei Water Resource 
Commission. It is possible to make the design process 
semi-automatic. The most difficult part of the whole 
process is to write the interface programs in order to 
make it an automatic process as much as possible. 
There are several new programs on the market that 
generate interface programs very easily. This paper 
used only one of them. Although more research 
required to be persued in the near future, it has been 
shown that a 80% to 90% automatic process of soil and 
water conservation engineering, especially in the design 
phase, can be performed. And a GIS can facilitate the 
soil and water conservation. 
5. REFERENCES 
Wu, Mu-Lin. 1990. Development of a GIS for Taipei 
Water Resource Commission. Research Report, Taipei 
Water Resource Commission, 72 pages. 
Wu, Mu-Lin, Huei-Shyong Yang, Der-Ren Song, 1991. 
A solid modeling of headwater landslides for a 
watershed management. In: Technical Papers, 1991 
ACSM-ASPRS Annual Convention, Baltimore, 
Maryland, U. S. À. vol. 4, pp. 250-256. 
Wu, Mu-Lin. 1991. Remote Sensing for environment 
monitoring at Taipei Water Resource Commission. 
Research Report, Taipei Water Resource Commission, 
42 pages.