Transcript A Visual Survey of Green Space Condition On Campus Brought to you by: Eric Decker And Peter Dotson-Westphalen.

A Visual Survey of Green
Space Condition On Campus
Brought to you by:
Eric Decker
And
Peter Dotson-Westphalen
1
Purpose of Study
• To visually survey and assess the
condition of green space in study area.
• To categorize types of green space in
study area according to infiltration rates.
• To identify degraded green spaces
• To provide a detailed map for
management and planning purposes.
2
Campus Surface Condition and Infiltration Study Area
Legend
c Infiltration Test Points
Surface Condition
Good (greenspace)
Moderate (compacted)
Poor (degraded)
Impervious (paved/bldgs)
Study Area
c
c
c
c
cc
N
0
100
200
300
400
500
600
700 Meters
Source Information:
Vermont Ortho Photographs
1999, NAD83 Projection
UVM Map Room.
Map Compilation by:
Eric Decker, UVM SNR
November, 2003.
3
Methods
• Downloaded Ortho Photos of UVM campus at
University map room.
• Used Photos to do a walk thru assessment to record
types of green spaces from the field.
• Imported Ortho-Photos into ArcView 3.2 for digitizing
of field survey results.
• Calculated green space areas from digitized
polygons.
• Conducted field measurements of infiltration rates
using the coffee can infiltrometer method for all
green space types.
• Developed map displaying digitized green space
polygons with infiltration test sites included
4
Results of Coffee Can Infiltrometer Experiments
Table 1: Infiltration Rates, % Cover
and Green Space Categories
Table 1
Infiltration Rates and Green Space Categorization
Test Site
#
Test Site
Infiltration Rate
(cm/hr)
Vegetation Cover
(%)
Aiken path
1
(new)
0.04
Aiken path
2
(old)
0.06
3 Green (bench)
6.16
Green Space
Category
0 poor
70 moderate
100 good
4 Green (tree)
1.2
30 moderate
5 Cook (path)
0.03
0 poor
6 Cook (green)
4.31
100 good
5
Results continued
Table 2
Area Totals and Percentages of Green Space Categories
Study Area
Surface
Condition
1 Good
Area
Percent of
Total
Acres
63640
15.7
44
2 Moderate
7410
1.8
5
3 Poor
2040
0.5
1
69920
17.2
50
143010
35.2
6
100
4 Impervious
Total
Average Infiltration Rate
Avg. Infiltration Rate (cm/hr)
6
5
4
Average Infiltration Rate
(cm/hr)
3
2
1
0
good
moderate
poor
Green Space Category
impervious
7
Campus Surface Condition and Infiltration Study Area 1
Legend
c Infiltration Test Points
Surface Condition
Good (greenspace)
Moderate (compacted)
Poor (degraded)
Impervious (paved/bldgs)
Study Area
c
c
N
0
40
80
120
160
200
240
280 Meters
Source Information:
Vermont Ortho Photographs
1999, NAD83 Projection
UVM Map Room.
Map Compilation by:
Eric Decker, UVM SNR
November, 2003.
8
Campus Surface Condition and Infiltration Study Area 2
Legend
c Infiltration Test Points
Surface Condition
Good (greenspace)
Moderate (compacted)
Poor (degraded)
Impervious (paved/bldgs)
Study Area
c
N
0
40
80
120
160
200
240
280 Meters
Source Information:
Vermont Ortho Photographs
1999, NAD83 Projection
UVM Map Room.
Map Compilation by:
Eric Decker, UVM SNR
November, 2003.
9
Campus Surface Condition and Infiltration Study Area 3
Legend
c Infiltration Test Points
Surface Condition
Good (greenspace)
Moderate (compacted)
Poor (degraded)
Impervious (paved/bldgs)
Study Area
c
c
N
0
40
80
120
160
200
240
280 Meters
Source Information:
Vermont Ortho Photographs
1999, NAD83 Projection
UVM Map Room.
Map Compilation by:
Eric Decker, UVM SNR
November, 2003.
10
Campus Surface Condition and Infiltration Study Area 4
Legend
c Infiltration Test Points
Surface Condition
Good (greenspace)
Moderate (compacted)
Poor (degraded)
Impervious (paved/bldgs)
Study Area
N
0
40
80
120
160
200
240
280 Meters
Source Information:
Vermont Ortho Photographs
1999, NAD83 Projection
UVM Map Room.
Map Compilation by:
Eric Decker, UVM SNR
November, 2003.
11
Discussion
• Poor green space makes up only 1% of
the study area, but due to its close
proximity to impervious surfaces, its
effects in channeling runoff are magnified
• Moderate green space makes up 5% of
the study area, but can cause runoff
problems during heavy rainfall due to its
relatively low infiltration rates as compared
to good green spaces
12
Recommendations
• Barriers to divert traffic to formal paths
through either planting shrubs or fencing off
green space areas
• Aerate and reseed moderate green space
areas
• Till and reseed poor areas and construct
barriers to impede foot traffic
• Accept natural formation of these paths, and
making them permanent walkways to reduce
hazards and increase aesthetics
13
Air Photo Showing Historic Green Space of Main Campus
Note: No date available for photo, but notice the change in green space prior to
Cook and Aiken
14
Old Mill
No dates available for either
picture
15 17
Perkins Geology Museum
Contemporary Perkins photo from
6/14/2000
No date available
16
Old Mill and Statue
No date available
Picture from 2/22/2000
17
Ira Allen Chapel
No date available
Picture from 6/14/2000
18