Horizontal Treatment - SD2 Stormwater Infrastructure 1:10

Horizontal Treatment can be used with LID devices such as green gutters or potentially rain gardens. Auburn’s high water tables limit the locations which standard bioretention devises can be used due to depth requirements. Where water tables are slightly too high to allow these standard devises to be used, an impermeable layer would be laid under the LID device forcing water to flow horizontally allowing treatment to take place in the lateral soils rather than the deeper soils reducing the required depth and allowing these devises to be used in areas with higher water tables. The lateral flow also helps to spread out mounding which can be a concern with larger bioretention devises that receive runoff from a large area. By spreading out the discharge to the edges of the impermeable layer, mounding occurs over a greater area, creating lower mounding. This effect would need to be quantified, but could also reduce the depth to water table requirement of 3 ft. Some initial calculations have been done to conserve the volume and cross-sectional flow area with the innovation from the typical bioretention devices. Soil qualities should be investigated for sediment transport and hydraulic conductivity to make sure piping does not become an issue and to find out how much flow can be handled. The impermeable layer could potentially peak in the center a bit to prevent water from accumulating on it. There may need to be structural supports in areas over the impermeable layer within the soil to prevent compaction.

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