Croisan Creek Watershed Data

The value of trees

Annual Air Pollution Removal Value in: pounds....................................163,367
U.S. dollars.............................$399,686

Total Carbon Stored: tons..........................................1,042

Carbon Sequestered Annually: tons..........................................8.11

Total Economic Benefit: U.S. dollars.............................$8,963,375

Total Area:

3.78 sq. miles

a

979.89sq. km (hectares)

a

2,421.28 acres

Landcover Composition:

0.32% of CROISAN CREEK

07.73 acres

- Water Area (100)

a

42.17% of CROISAN CREEK

1,021.02 acres

- Forest Patches

a

38.51% of CROISAN CREEK

932.50 acres

- Grass w/ Scattered Shrubs

a

13.82% of CROISAN CREEK

334.58 acres

- Disturbed land (87)

a

00.68% of CROISAN CREEK

16.36 acres

- Impervious Surfaces: Buildings

a

04.49% of CROISAN CREEK

108.80 acres

- Impervious Surfaces: Paved Streets

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.

Ecological Services:

Carbon Removal Benefits:

a

- Age Distribution:

Average or Unknown

a

- Storage Capacity (tons):

1,041.74

a

- Sequestration Rate (tons/year):

8.11

a

aa

a

Air Pollution Removal Benefits:

a

- Air-Quality Reference City:

Seattle

a

- Contaminant:

Lbs/Year:

Dollar Value:

a

- - O3 (Ozone)

59,507.43

$ 182,662.16

a

- - SO2 (Sulfur Dioxide)

25,662.28

$ 19,295.13

a

- - NO2 (Nitrogen dioxide)

0

$ 0.00

a

- - PM10 (particulates <10 microns)

64,252.53

$ 131,652.33

a

- - CO (Carbon monoxide)

13,944.78

$ 6,076.63

a

Totals:

163,367.03

$ 339,686.25

Stormwater Runoff Control Benefits :

- Avg. 2-yr, 24-hour Precipitation (in.):

5.5

d

- Site Avg. Slope (%):

19.9

d

- Rainfall Region:

IA

d

- Hydrologic Soil Group:

C

d

v

Current Conditions

Modeled w/out trees

d

- Curve Number:

81

84

d

- Runoff Depth (in):

3.43

3.73

d

- Time of Concentration (hrs):

1.39

1.26

d

- Peak Flow (cfs):

1,253.56

1,410.95

d

- Runoff Volume (cu. ft.):

30,155,828.15

32,790,238.50

d

- Storage required to mitigate the change in peak flow (cu. ft.):

4,311,844.35

Total Economic Benefit of Trees in Salem UGB

- Construction Cost (@ $2.00/ cu ft.):

$8,623,688.70