Bioinfiltration swales are depressed areas, commonly referred to as swales. These facilities are either planted with grasses, shrubs, and trees, or are sodded and irrigated, or seeded with drought tolerant native grasses. Sand filters are used in areas where space constraints render typical roadside swales not feasible. Sand filters are either placed under the sidewalk or in the curbline, intercepting the stormwater and filtering it through a special media that captures pollutants. Porous pavement is only proposed in areas where vehicle travel does not occur, such as parking areas or, again, in areas where space or utility conflicts make swales or sand filter construction difficult. All of these treatment facilities are effective practices for stormwater pollutant removal.
Spokane County SWU tries to combine our stormwater retrofit projects with current or projected future road restoration projects in order to economize the cost associated with such work. Combining these projects also means less disruption to the surrounding area as both the road and stormwater structures are improved at the same time versus in separate construction seasons.
Spokane County Stormwater Utility would like your input on this proposed project. Please take a moment to
complete a survey in order to provide us with valuable feedback with regard to this proposed project.
Thank you,
Spokane County Public Works
Stormwater Utility