West Hills Innovative Stormwater Demonstration
Final Report, Appendix B: Preliminary Cost Estimate

What's included:

  • Design & construction costs. While some narratives suggest using volunteers to perform certain tasks, costs for all projects assume that the practice will be installed by a professional, licensed landscape contrator and designed by professionals as well, when needed.
  • Most practices based on detailed specifications and methods. For all practices except revegetating steep slopes, implementation steps from the fact sheet were provided to Nathan Hale, a landscape architect at at Cascadian Landscapers (503) 647-9933.
  • Revegetation based on current planting costs. For revegetating steep slopes, Matt Stine of of Native Ecosystems Northwest, LLC (971) 404-4745 provided costs based on a description of the sites and some of the information provided in the revegetation section on Chapter 5. His cost was increased slightly to account for traffic control at some sites such as the ones fronting Thompson Road.
  • Bioretention based on real world costs. For bioretention, maintenance during the 2-year establishment period is included, in addition to design, permit, & construction costs. Unit costs for stormwater planters in the public right-of-way were provided by the City of Portland. Unit costs for other facilities (rain gardens, swales, and vegetated filter strips) were determined by discounting the city's unit costs by 10%, since, at the FHHOA, these facilities have more accessible overflow connections and no curbs.

What's not included:

  • Except for a 2-year estabalishment period for bioretention, maintenance costs are not included in the design and construction costs.
  • Permitting costs
Unit Cost of Practices

View or download a copy of the preliminary cost estimate for practices [pdf]

Preliminary Cost Estimate for Projects

Preliminary project costs are listed below. Some bioretention projects manage runoff from the public right-of-way and the team has received preliminary confirmation that these are eligible to be added to the City of Portland's capitol improvements list. Were this to happen, the City of Portland would add them to their budget and build them out over time, thus, the column that adds up project costs without those projects ("Cost without capitol improvement projects").

Project Ranking
Project description
Cost
Cost without capitol improvement projects
1
Revegetate/ Stabilize slopes $15,305 $15,305
2
Revegetate/ Stabilize slopes $10,843 $10,843
3
Revegetate/ Stabilize slopes $7,373 $7,373
4
Revegetate/ Stabilize slopes $5,662 $5,662
5
Revegetate/ Stabilize slopes $5,326 $5,326
6
Revegetate/ Stabilize slopes $4,708 $4,708
7
Revegetate/ Stabilize slopes $4,459 $4,459
8
Revegetate/ Stabilize slopes $4,295 $4,295
9
Revegetate/ Stabilize slopes $4,232 $4,232
10
Revegetate/ Stabilize slopes $3,950 $3,950
11
Revegetate/ Stabilize slopes $2,632 $2,632
12
Revegetate/ Stabilize slopes $2,320 $2,320
13
Revegetate/ Stabilize slopes $1,869 $1,869
14
Revegetate/ Stabilize slopes $1,595 $1,595
15
Revegetate/ Stabilize slopes $1,539 $1,539
16
Revegetate/ Stabilize slopes $1,302 $1,302
17
Revegetate/ Stabilize slopes $1,236 $1,236
18
Revegetate/ Stabilize slopes $1,193 $1,193
19
Revegetate/ Stabilize slopes $1,178 $1,178
20
Revegetate/ Stabilize slopes $1,053 $1,053
21
Revegetate/ Stabilize slopes $915 $915
22
Restored Soils (from Lawn to Lawn) $55,745 $55,745
23
Restored Soils (from Lawn to Lawn) $15,882 $15,882
24
Restored Soils (from Lawn to Lawn) $9,125 $9,125
25
Restored Soils (from Lawn to Lawn) $7,347 $7,347
26
Restored Soils (from Lawn to Lawn) $6,368 $6,368
27
Restored Soils (from Lawn to Lawn) $2,650 $2,650
28
Bioretention: Stormwater planter $22,888 $22,888
29
Bioretention: Stormwater planter $23,744
30
Bioretention: Stormwater planter $23,270
31
Bioretention: Stormwater planter $21,515
32
Bioretention: Swale $28,551 $28,551
33
Bioretention: Stormwater planter $30,089
34
Bioretention: Stormwater planter $18,128
35
Bioretention: Stormwater planter $15,259
36
Bioretention: Stormwater planter $38,910
37
Bioretention: Stormwater planter $15,259 $15,259
38
Bioretention: Swale $20,943
39
Bioretention: Swale $22,316
40
Bioretention: Stormwater planter $19,837
41
Bioretention: Stormwater planter $19,837
42
Bioretention: Stormwater planter $19,531 $19,531
43
Bioretention: Vegetated filter strip $56,649
44
Bioretention: Stormwater planter $18,540
45
Bioretention: Swale $24,658
46
Bioretention: Swale $15,450
47
Bioretention: Rain garden $12,360 $12,360
48
Restored Soils (from Lawn to Perennial Garden) $47,549 $47,549
49
Restored Soils (from Lawn to Perennial Garden) $32,634 $32,634
50
Restored Soils (from Lawn to Perennial Garden) $16,661 $16,661
51
Restored Soils (from Lawn to Perennial Garden) $12,273 $12,273
52
Restored Soils (from Lawn to Perennial Garden) $8,926 $8,926
53
Depaving (Low Traffic) $105,483 $105,483
54
Depaving (Low Traffic) $29,136 $29,136
55
Depaving (Low Traffic) $28,809 $28,809
56
Depaving (Low Traffic) $26,889 $26,889
57
Depaving (Low Traffic) $19,744 $19,744
58
Porous Walkway $22,883 $22,883
59
Porous Walkway $15,528 $15,528
60
Porous Walkway $10,624 $10,624
61
Porous Walkway $8,775 $8,775
62
Restored Soils (from Lawn to Meadow) $39,967 $39,967
63
Porous Roadway $59,053 $59,053
64
Depaving (Medium Traffic) $98,835 $98,835
Total for all projects
$1,231,600 $862,500
Financial Funding

A variety of grants are applicable to this effort from a variety of sources, linked here. Often, matching funds are needed.

Mary Logalbo at the West Multnomah Soil & Water Conservation District may also be able to provide insight and assistance on these and other grants.

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