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Glen/Gibson Watershed Data
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The value of trees
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| Table 6 Land cover Distribution:
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1,262 acres (24%) Disturbed Land (Graded/Grubbed
305 acres (5%) Impervious Roads
72 acres (1%)) Impervious Buildings
2,225 acres (42%) Open Space/Pasture/Meadow
1,352 acres (26%) Forest Patches
26 acres (.5%)) Water
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Stormwater Management in: cubic feet................................. 9,577,330
(one time value) U.S. dollars..............................$19,154,661
Annual Air Pollution Removal Value in: pounds....................................353,821
U.S. dollars.............................$735,695
Total Carbon Stored: tons..........................................2,256
Carbon Sequestered Annually: tons.........................................17.57
Total Economic Benefit: U.S. dollars..............................$19,890,357
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| Scroll down for more detailed information about the above data . |
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Total Area:
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8.19 sq. miles
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2,121.97 sq. km (hectares)
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5,243.33 acres
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Landcover Composition:
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0.49% of GLENN / GIBSON
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25.53 acres
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- Water Area (100)
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25.80% of GLENN / GIBSON
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1,352.60 acres
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- Forest Patches
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42.44% of GLENN / GIBSON
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2,225.40 acres
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- Grass w/ Scattered Shrubs
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24.07% of GLENN / GIBSON
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1,262.24 acres
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- Disturbed land (87)
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01.38% of GLENN / GIBSON
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72.47 acres
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- Impervious Surfaces: Buildings
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05.82% of GLENN / GIBSON
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305.13 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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- Age Distribution:
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Average or Unknown
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- Storage Capacity (tons):
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2,256.22
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- Sequestration Rate (tons/year):
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17.57
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Air Pollution Removal Benefits:
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- Air-Quality Reference City:
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Seattle
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- Contaminant:
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Lbs/Year:
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Dollar Value:
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- - O3 (Ozone)
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128,881.75
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$ 395,611.40
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- - SO2 (Sulfur Dioxide)
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55,579.60
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$ 41,789.57
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- - NO2 (Nitrogen dioxide)
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0
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$ 0.00
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- - PM10 (particulates <10 microns)
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139,158.74
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$ 285,133.84
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- - CO (Carbon monoxide)
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30,201.75
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$ 13,160.83
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Totals:
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353,821.83
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$ 735,695.64
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Stormwater Runoff Control Benefits :
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- Avg. 2-yr, 24-hour Precipitation (in.):
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5.5
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- Site Avg. Slope (%):
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19.9
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- Rainfall Region:
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IA
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- Hydrologic Soil Group:
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C
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Current Conditions
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Modeled w/out trees
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- Curve Number:
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83
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85
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- Runoff Depth (in):
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3.63
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3.83
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- Time of Concentration (hrs):
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1.88
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1.76
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- Peak Flow (cfs):
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2,562.23
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2,778.15
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- Runoff Volume (cu. ft.):
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69,085,519.55
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72,950,683.71
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- Storage required to mitigate the change in peak flow (cu. ft.):
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9,577,330.92
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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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$19,154,661.84
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