Geoscience Reference
In-Depth Information
Table 7.2 Preliminary weighting for GIS model
Weighting a
Streams
Primary parameter
Isolated wetlands
Streams w/Wetlands
0 0 -50 0
500 0 - 1000 0
0 0 -500 0
Distance from stream
Proximity to stream
High
High
High
Proximity to 100-yr floodplain
High
0
High
Land use/land cover
Medium
Medium
High
Presence of hydric soils
Low
High
High
Percent canopy cover
Low
High
High
Presence of impervious surface
Medium
High
High
Proximity of wetlands b
NWI
Medium
High
High
319
Medium
High
High
Proximity to rare species
0
Medium
Medium
High c
High d
High d
Slope
Proximity to ODNR sites
0
Medium
Medium
Proximity to metropark lands
0
Medium
Medium
Presence of agricultural land
High
Medium
Medium
a High
¼
5, Medium
¼
3, Low
¼
1, no weight
¼
0
b 319 Wetland information supersedes NWI data
c For streams, the greater the slope, the higher the weighting
d For isolated wetlands and steams w/wetlands, the flatter the slope, the higher the weighting
The preliminary model was developed using the following parameters as
primary indicators:
• Proximity to the stream channel
• Proximity to 100-year floodplain
• Land use/land cover type
• Presence/absence of hydric soils
• Percent existing canopy cover
• Presence/absence of impervious cover
• Presence of impervious surface
• Proximity to wetlands, as indicated by National Wetland Inventory Mapping or
Section 319 Wetlands
• Proximity to rare species
• Slope
• Proximity to existing Ohio Department of Natural Resource protected lands
• Proximity to Toledo Metropark lands
• Presence of agricultural lands
Each of the primary parameters was then assigned a weighting of high, medium
or low, based on its ability to predict the restoration or enhancement potential for
one of the three given areas (stream, isolated wetlands or streams with wetlands).
The weighting system that was developed is presented in Table 7.2 . A number of
parameters were then identified as secondary factors that would be used to refine the
Search WWH ::




Custom Search