06-27-2016 Council Packet - Laserfiche WebLink

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Draft – 10/1/15 Central Storage 900 0 902 150 East Storage 906 0 910 54 912 54 Regional Storage Basin Controlled by the City, Gated Operation • Operation of the gated facility shall be controlled by the City of Lino Lakes. • A gate shall be placed to control the release of water from each regional storage facility. • Each gate must be closed when Peltier Lake reaches an elevation 1-foot below the 100-year flood elevation of 886.2 (NAVD 1988) on the rising limb of the lake stage hydrograph and remain closed until the flood elevation on Pelteir Lake recedes below the 100-year flood elevation of 886.2, on the falling limb of the lake stage hydrograph. • The regional storage shall be designed to ensure no local flood impact as a result of successive (back – to – back) precipitation events, when the gates are closed. • No flood impact (downstream or upstream) shall occur to downstream structures, infrastructure, and land currently at an elevation of 887.2 or less. Maximum Discharge Characteristics and Flood Peak Timing Between Regions Maximum Rate of Discharge Between Regions for the 100-year, 24-hour Precipitation Event Estimated Peak Discharge (cfs) Estimated Event Runoff Volume (acre feet) Timing of the Peak Elevation (hours) After Initiation of Precipitation Event City of Hugo and East Region 35.4 ** 89.2 12.8 I 35E Culvert(s) Peak Discharge (100-yr, 24-hr) 54.0 293.9 77.8 East Region and Central Region 54.0 293.9 77.8 Central Region and West Region 150.6 466.3 78.0 West Region and Peltier Lake 171.1 548.5 78.2 *2-yr, 24-hr and 10-yr, 24-hr are yet to be provided ** This discharges is based on adding the hydrographs for nodes CA55MTL_012, CA55MTL_013, CA55MTL_011, and CA55MTL_025A from the proposed WSB InfoSWMM model, submitted 9-11-2015