Mill Creek Watershed Data

The value of trees

Annual Air Pollution Removal Value in: pounds....................................377,422
U.S. dollars.............................$784,766

Total Carbon Stored: tons..........................................2,406

Carbon Sequestered Annually: tons..........................................18.74

Total Economic Benefit: U.S. dollars.............................$784,766

*Change in watershed for stormwater management is minimal with a "no tree" scenario

Total Area:

8.74 sq. miles

z

2,263.5 sq. km (hectares)

z

5,593.04 acres

Landcover Composition:

05.81% of MILL CREEK

324.87 acres

- Water Area (100)

a

14.26% of MILL CREEK

797.73 acres

- Forest Patches

a

42.09% of MILL CREEK

2,353.95 acres

- Grass w/ Scattered Shrubs

a

19.69% of MILL CREEK

1,101.42 acres

- Disturbed land (87)

a

04.73% of MILL CREEK

264.76 acres

- Impervious Surfaces: Buildings

a

13.42% of MILL CREEK

750.36 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):

2,406.71

a

- Sequestration Rate (tons/year):

18.74

a

S

S

aa

Air Pollution Removal Benefits:

a

- Air-Quality Reference City:

Seattle

a

- Contaminant:

Lbs/Year:

Dollar Value:

a

- - O3 (Ozone)

137,478.13

$ 421,998.58

a

- - SO2 (Sulfur Dioxide)

59,286.75

$ 44,576.92

a

- - NO2 (Nitrogen dioxide)

0

$ 0.00

a

- - PM10 (particulates <10 microns)

148,440.59

$ 304,152.19

a

- - CO (Carbon monoxide)

32,216.19

$ 14,038.65

a

Totals:

377,421.66

$ 784,766.35

D

D

D

D

Stormwater Runoff Control Benefits :

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

3.5

a

- Site Avg. Slope (%):

1.53

a

- Rainfall Region:

IA

a

- Hydrologic Soil Group:

C

a

aaa

Current Conditions

Modeled w/out trees

a

- Curve Number:

87

87

a

- Runoff Depth (in):

2.18

2.18

a

- Time of Concentration (hrs):

6.09

6.09

a

- Peak Flow (cfs):

956.23

956.23

a

- Runoff Volume (cu. ft.):

44,307,820.24

44,307,820.24

a

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

0

Total Economic Benefit of Trees in Salem UGB

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

$0.00