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REQUEST FOR DRAINAGE COMMITTEE AGENDA ITEM <br />Agenda Date Requested: July 9, 2018 <br />Requested By: Lorenzo Wingate <br />Department: Public Works <br />Report: w " Resolution: (D Ordinance:( <br />Exhibits: <br />Appropriation <br />Source of Funds: <br />Account Number: <br />Amount Budgeted: <br />Amount Requested: <br />Budgeted Item: y " YES NO <br />SUMMARY <br />A proposed conditions hydraulic model was developed during the preliminary design for the N P Street Culvert <br />Improvement Project, which recommended replacing the upstream portion of the existing composite structure at <br />N P Street, with structures matching the downstream portion of the composite structure. That project allows for <br />full utilization of the structure's capacity, as well as protect the channel during rainfall events that produce higher <br />amounts of runoff. Per the recommendations of the Phase 1 report, a more detailed Phase 2 engineering <br />analysis of segments F101-00-00 and 1`101-08-00, that are upstream of N P Street, as well as an evaluation of <br />the roadside ditch drainage conduits within Battleground Estates should be performed to identify necessary <br />improvements to address structural flooding within the area. The more detailed study would evaluate the impacts <br />of culverts located upstream of N P Street, along F-101-00-00 resulting from the 10-, 50-, and 100-year rain <br />event. Channel improvements, and increasing culvert sizes to provide sufficient capacity within culverts along <br />the roadside ditches are the anticipated mitigation efforts. <br />Estimated cost to improve the channel conveyance upstream of N " P" Street is $565,000. <br />Action Re quire d: <br />Approved for Drainage Committee Agenda <br />Corby D. Alexander, City Manager Date <br />