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How does the new bio-infiltration swale and subsurface pipe system work?
The new system is a combination landscaped bio-infiltration swale for treatment of stormwater runoff and a subsurface pipe to carry flood and ground water from Five Mile Prairie, plus serve as conveyance during large storm events; overflow structures are connected to the pipe.

Runoff from Country Homes Boulevard, and the neighboring side-streets, driveways, and sidewalks will either sheet flow into the new swale area and slowly infiltrate through the bio-engineered treatment soil, or, in places where side-street runoff is currently hard-piped into the existing asphalt channel, where constructible will now be hard-piped to the swale onto an energy dissipator.

Stormwater that is carried in the subsurface pipe may still outfall at the same termination point that it did in its pre-construction condition: at the Price and Wall Regional Stormwater Facility.

Show All Answers

1. What does CHBRP Mean?
2. Why build the CHBRP?
3. Why couldn't the Stormwater Utility just seal the cracks in the channel? Wouldn't that have been enough to keep the weeds from growing?
4. Who financed the CHBRP?
5. What were the project limits?
6. What was the projected timeline for construction?
7. People drive way too fast on Country Homes Boulevard. Will the project make it worse?
8. What regulatory permitting processes affected construction of the CHBRP?
9. How does the new bio-infiltration swale and subsurface pipe system work?
10. Will the swale be able to handle heavy rainfall in the same capacity that the existing asphalt channel did?
11. Will standing water in the bio-infiltration swale attract mosquitoes?
12. How will the bio-infiltration swale handle snow?
13. How will the project affect irrigation?
14. Who will be responsible for post-construction landscape maintenance?
15. Weeds were a huge nuisance in the channel. How will the CHBRP fix this problem?
16. As the native grasses and trees grow, will visibility at the intersections / crossings along Country Homes Boulevard be impaired?
17. Will there be permanent signage placed at the site?
18. Since there will not be signs, how will the public be made aware of the CHBRP?
19. Will wildlife be enticed to nest or live in the bio-infiltration swale?

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  1. Spokane County
  2. 1116 W Broadway Avenue
  3. Spokane, WA  99260
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  1. Spokane County Washington
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