06-11-18 Drainage and Flooding Committee Meeting

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REQUEST FOR DRAINAGE COMMITTEE AGENDA ITEM Agenda Date Requested: June 11, 2018 Requested By: L. Wingate/D. Pennell Department: Public Works Report: �*, Resolution: C-Ordinance: C- Exhibits : Appropriation Source of Funds: Account Number: Amount Budgeted: Amount Requested: Budgeted Item: 4, YES C-NO SUMMARY A proposed conditions hydraulic model was developed during the preliminary design for the N P Street Culvert Improvement Project, which recommended replacing the upstream portion of the existing composite structure at N P Street, with structures matching the downstream portion of the composite structure. That project allows for full utilization of the structure's capacity, as well as protect the channel during rainfall events that produce higher amounts of runoff. Per the recommendations of the Phase 1 report, a more detailed Phase 2 engineering analysis of segments F101-00-00 and 1`101-08-00, that are upstream of N P Street, as well as an evaluation of the roadside ditch drainage conduits within Battleground Estates should be performed to identify necessary improvements to address structural flooding within the area. The more detailed study would evaluate the impacts of culverts located upstream of N P Street, along F-101-00-00 resulting from the 10-, 50-, and 100-year rain event. Channel improvements, and increasing culvert sizes to provide sufficient capacity within culverts along the roadside ditches are the anticipated mitigation efforts. Action Re quire d: Approved for Drainage Committee Agenda Corby D. Alexander, City Manager Date