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Willamette Slough Data
The value of trees
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Table 14
Land cover Distribution: |
679 acres (18%) Disturbed Land (Graded/Grubbed)
179 acres (7%) Impervious Roads
53 acres (1%) Impervious Buildings
1,339 acres (36%) Open Space/Pasture/Meadow
809 acres (22%) Forest Patches
513 acres (14%) Water
xa |
Stormwater Management in: cubic feet.................................2,893,439
(one time value) U.S. dollars..............................$5,786,878 Annual Air Pollution Removal Value in: pounds....................................54,564
U.S. dollars.............................$113,453
Total Carbon Stored: tons..........................................348
Carbon Sequestered Annually: tons..........................................2.71
Total Economic Benefit: U.S. dollars.............................$5,900,332
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a |
| Scroll down for more detailed information about the above data . |
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A |
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Total Area:
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5.8 sq. miles
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a
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1,502.16 sq. km (hectares)
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a
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3,711.79 acres
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Landcover Composition:
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13.82% of WILLAMETTE SLOUGH
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512.93 acres
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- Water Area (100)
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a
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21.78% of WILLAMETTE SLOUGH
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808.59 acres
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- Forest Patches
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a
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36.08% of WILLAMETTE SLOUGH
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1,339.34 acres
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- Grass w/ Scattered Shrubs
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a
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18.30% of WILLAMETTE SLOUGH
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679.33 acres
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- Disturbed land (87)
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a
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01.44% of WILLAMETTE SLOUGH
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53.41 acres
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- Impervious Surfaces: Buildings
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a
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04.82% of WILLAMETTE SLOUGH
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178.94 acres
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- Impervious Surfaces: Paved Streets
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Definitions:
- Forest Patches (Wooded or forested with non-turf understory): Woods grazed but not burned, some forest litter (Fair Hydrologic Condition).
- Grass/Scattered Trees (Lawns, parks, golf courses, cemeteries, etc.): Grass cover < 50% (Poor Hydrologic Condition).
- Disturbed land - Graded, grubbed, minimal vegetation.
- Impervious Surfaces: Buildings, pavilions and other man-made structures, paved streets, open ditches.
- Sequestration: The rate at which a tree adds carbon to its biomass.
- Carbon storage: The amount of carbon stored in tree biomass.
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Ecological Services:
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Carbon Removal Benefits:
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a
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- Age Distribution:
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Average or Unknown
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a
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- Storage Capacity (tons):
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347.94
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a
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- Sequestration Rate (tons/year):
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2.71
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a
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aa
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a
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Air Pollution Removal Benefits:
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a
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- Air-Quality Reference City:
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Seattle
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a
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- Contaminant:
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Lbs/Year:
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Dollar Value:
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a
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- - O3 (Ozone)
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19,875.17
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$ 61,008.20
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a
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- - SO2 (Sulfur Dioxide)
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8,571.07
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$ 6,444.47
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a
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- - NO2 (Nitrogen dioxide)
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0
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$ 0.00
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a
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- - PM10 (particulates <10 microns)
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21,460.01
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$ 43,971.18
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a
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- - CO (Carbon monoxide)
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4,657.48
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$ 2,029.56
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a
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Totals:
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54,563.72
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$ 113,453.41
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A
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A
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A
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A
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Stormwater Runoff Control Benefits :
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- Avg. 2-yr, 24-hour Precipitation (in.):
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4.25
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a
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- Site Avg. Slope (%):
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19.9
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a
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- Rainfall Region:
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IA
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a
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- Hydrologic Soil Group:
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B
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a
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a
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Current Conditions
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Modeled w/out trees
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a
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- Curve Number:
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71
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72
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a
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- Runoff Depth (in):
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1.57
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1.64
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a
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- Time of Concentration (hrs):
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8.43
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8.2
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a
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- Peak Flow (cfs):
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362.26
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384.96
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a
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- Runoff Volume (cu. ft.):
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21,123,685.80
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22,067,256.26
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a
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- Storage required to mitigate the change in peak flow (cu. ft.):
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2,893,439.14
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Total Economic Benefit of Trees in Salem UGB
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- Construction Cost (@$2.00/ cu ft.):
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$5,786,878.27
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