Washington Street West watershed - City of Champaign

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PondSize(acres)PondDepth(feet)Table 6-3Robinson Court PondMaximumPond Volume(ac-ft)Draft ReportWest Washington Street Watershed Master PlanEffectivePond Volume(ac-ft)InletSewer(inches)OutletSewer(inches)1.7 15 24.4 14.7 24-36 8-12The Robinson Court Pond is the West Washington Street trunk sewer detention pond thatis located the farthest upstream and the closest to the worst flooding in the watershed.This pond would replace the homes along Robinson Court, approximately 9 homes, andthe inlet and outlet designs would again be similar to the previous alternatives. The closeproximity of this detention pond to the surface flooding at the intersection of WestWashington Street and North Russell Street lends to the consideration of purchasing oneof the homes between the pond and the intersection so that an overland flow path couldbe developed to convey surface ponding to the detention pond.This pond location was chosen based on the close proximity to the West WashingtonStreet trunk sewer to maximize the storage volume. This stormwater detention volumewould be used for both trunk sewer relief and surface flooding storage, requiring somenew storm sewer, but not nearly as much as the other West Washington Street detentionponds. This pond location also lends itself well to be implemented in a multiple pondwatershed design or a large regional pond by expanding the size of the pond to the localroads. The other benefit of this pond is the location just downstream of the main trunksewer junction. This creates a hydraulic benefit that extends into the North Edwin Streetand North McKinley Avenue trunk sewers.The primary limit of this alternative is the same limits that occur at many of the otherponds that are located within residential neighborhoods. The elimination of 9 homes, therelatively small footprint, and this option is not a standalone alternative. Any expansionwould eliminate more homes and any attempt to make the pond more aestheticallypleasing would reduce the overall storage volume.September 20096-8Clark Dietz, Inc.
Draft ReportWest Washington Street Watershed Master Plan6.3.1.2 North McKinley Avenue Trunk Sewer Stormwater Detention PondsRailroad PondPondSize(acres)PondDepth(feet)MaximumPond Volume(ac-ft)Figure 6-5Railroad PondTable 6-4Railroad PondEffectivePond Volume(ac-ft)InletSewer(inches)OutletSewer(inches)2.1 13.5 27.5 16.1 24-36 8-12The Railroad Pond is a proposed pond that would be located adjacent to the railroadtracks between North Edwin Street and North James Street. This pond is intended toserve the North McKinley trunk sewer and the northeastern portions of the watershed.The location of this pond is designed to accept flow from the 36-inch storm sewer onWest Columbia Avenue and discharge back into that same sewer a short distancedownstream.The location of this pond is in a residential neighborhood and will have all the samenegative attention attached to it as the other residential area ponds; however, the northernborder of the pond is the railroad tracks and the Concrete Facility. This close proximityto these structures and the fact that North Edwin Street is the entrance to the ConcreteFacility makes this pond location a little less intrusive to the neighborhood. This locationSeptember 20096-9Clark Dietz, Inc.
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Washington Street West watershed - City of Champaign

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