02-12-2015 Planning Comm. Minutes

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MINUTES PLANNING COMMISSION FEBRUARY 12, 2015 lots. He stated that there will be a maintenance agreement and cross - easements in place for these gardens. Schwalbach asked if the water from these proposed lots will first go into the rain water gardens and then diverted into the wooded area between the Keller Parkway homes or will it all flow directly onto 715 Keller Parkway. The City Engineer pointed out that he is requiring that the developer revise and resubmit storm water calculations based on the new Atlas 14 rainfall events. The Engineer indicated that the storm water pond will maintain runoff from up to a 100 -year event and will then discharge water at a little less than the current rate. The Engineer indicated that during larger events the discharge volume will increase, which could adversely affect the property owner to the south. The Engineer indicated that based on his review of the grading plan, it appears that the lots are proposed to be graded so that water is directed toward the middle of the lot at 715 Keller Parkway and toward the house itself. "I'he Engineer indicated that his recommendation that the applicant work with the adjacent property owner at 715 Keller Parkway is an effort to eliminate that situation. Buesing asked if during a 100 -year event the rain water garden would stay full longer and then discharge as the current rate that run-off occurs onto 715 Keller Parkway. The Engineer replied that the discharge rate will be a little less but that the discharge will occur over a longer period of time. Ledin asked the cost to directly bore and install a pipe to Keller Parkway. Carlson estimated the cost to be in the $5,000 to $7,000 range. Carlson indicated that he is willing to install such a pipe. The City Engineer indicated that the installation of this pipe would alleviate his concerns given that run-off would be directed to the public right-of-way and not toward someone's house. He noted that the property owner to the south would have to grant an easement for this pipe. Murphy asked if there were any other options that could be considered. The City Engineer indicated that another option would be to make the storm water pond larger. Buesing asked if installing a pipe and discharging into the public right-of- way would direct run-off essentially where it is going now. The City Engineer stated that in theory that is correct, the change is that the run-off would be piped and would not be running across 715 Keller Parkway. The Engineer informed the applicant to it may be necessary to obtain a County permit given Keller Parkway is a County road. He also suggested that the applicant check with the Watershed as well. -4-