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Pettijohn Creek Watershed Data
The value of trees
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Table 12
Land cover Distribution: |
96 acres (9%) Disturbed Land (Graded/Grubbed)
18 acres (2%) Impervious Roads
3 acres (0.3%) Impervious Buildings
349 acres (34%) Open Space/Pasture/Meadow
551 acres (54%) Forest Patches
2 acres (0.2%) Water
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Stormwater Management in: cubic feet................................. 1,719,036
(one time value) U.S. dollars..............................$3,438,071 Annual Air Pollution Removal Value in: pounds....................................68,860
U.S. dollars.............................$143,179
Total Carbon Stored: tons..........................................439
Carbon Sequestered Annually: tons...........................................3.42
Total Economic Benefit: U.S. dollars..............................$3,581,251
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| Scroll down for more detailed information about the above data . |
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Total Area:
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1.59 sq. miles
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412.94 sq. km (hectares)
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1,020.35 acres
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Landcover Composition:
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00.19% of PETTIJOHN
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01.97 acres
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- Water Area (100)
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54.02% of PETTIJOHN
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551.23 acres
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- Forest Patches
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34.21% of PETTIJOHN
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349.03 acres
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- Grass w/ Scattered Shrubs
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09.45% of PETTIJOHN
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96.43 acres
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- Disturbed land (87)
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00.33% of PETTIJOHN
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03.41 acres
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- Impervious Surfaces: Buildings
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01.80% of PETTIJOHN
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18.38 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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439.1
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a
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- Sequestration Rate (tons/year):
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3.42
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a
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z
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z
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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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25,082.65
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$ 76,992.93
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a
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- - SO2 (Sulfur Dioxide)
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10,816.77
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$ 8,132.98
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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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27,082.74
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$ 55,492.06
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a
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- - CO (Carbon monoxide)
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5,877.79
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$ 2,561.33
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a
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Totals:
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68,859.95
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$ 143,179.30
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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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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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C
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a
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xxx
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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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79
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82
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a
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- Runoff Depth (in):
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3.24
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3.53
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a
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- Time of Concentration (hrs):
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0.98
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0.89
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a
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- Peak Flow (cfs):
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560.52
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629.36
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a
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- Runoff Volume (cu. ft.):
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11,987,772.65
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13,074,006.41
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a
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- Storage required to mitigate the change in peak flow (cu. ft.):
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1,719,035.88
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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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$3,438,071.77
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