Environmental Engineering Reference
In-Depth Information
Step 1
Map data factors by type
C
A—Slightly eroded
B
A—00%-10%
B —Slight to moderate
B
C
A
A
B—10%-20%
C—20%-40%
C—Moderate
D
D—Extremely eroded
Slope map
Erosion map
Step 2
Rate each type of each factor for each land use
Factor types
Agriculture
Housing
Example 1
A
B
C
1
2
3
1
1
3
Example 2
A
B
C
1
2
3
1
2
2
1—Prime suitability
2—Secondary
3—Tertiary
D
4
3
Step 3
Map rating for each and use one set of maps for each land use
Example 1
Example 2
Example 1
Example 2
3
2
2
2
2
3
1
1
3
1
1
1
3
3
Agriculture
Agriculture
Housing
Housing
Step 4
Overlay single factor suitability maps to obtain composites
One map for each land use
5
6
4
3
3
5
3
Lowest numbers are best suited for land use
4
5
3
5
3
4
2
2
4
2
3
6
4
6
4
5
4
Highest numbers are least suited for land use
Agriculture
Housing
FIGURE 13.3
Suitability analysis procedure.
shows allocations of uses and actions. The scenarios set possible directions for future
management of the area and therefore should be viewed as a basis for discussion where
choices are made by the community about its future.
Choices should be based on the goals of the planning effort. For example, if it is the
goal to protect agricultural land yet allow some low density housing to develop, different
organizations of the environment for those two land uses should be developed. Different
schemes for realizing the desired preferences also need to be explored.
The Dutch have devised an interesting approach to developing planning options for
their agricultural land reallocation projects. Four land-use options are developed, each
with the preferred scheme for a certain point of view. Optional land-use schemes of the
area are made for nature and landscape, agriculture, recreation, and urbanization. These
schemes are constructed by groups of citizens working with government scientists
and planners. To illustrate, for the nature and landscape scheme, landscape architects
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