04-21-2025 - Agenda Packet Planning Commission - Packet

Home Browse Search

maximum allowable height we could create a structure that meets both the minimum floor elevation as well as stays within the City’s volume of the existing structure. However, the MCWD has a requirement that all openings be at least two feet above the 100-year flood elevation – functionally one foot higher than the City’s code requires. In the case of MCWD, the relevant section is their Floodplain Alteration Rule. Under Section 2 – Applicability the rule states that, “…a structure intended for residential, commercial, industrial, or institutional occupancy must be constructed so that door and window openings are at least two feet above the 100-year high water elevation of the waterbody.” Our request for this variance is directly related to this one foot diƯerence in height between the City Code and the MCWD rule. The sloped roof of the current boathouse has a lowest height above existing grade of 9’-2” and is 10’-5” above existing grade at its highest. In granting the variance, the height of the new structure above the new grade will be about 8’-6”. In actuality, the distance from the grade to the top of the roof will be shorter than the existing boathouse yielding less of a visual impact and, relative to the existing boathouse, will appear shorter. Further, the highest point on the existing boathouse is 942.19’ ASL. Whereas the proposed maximum height of the new boathouse will be 942.03’ ASL. Thus, the actual overall height of the proposed structure will be approximately 2” lower in real terms than the existing highest point even with the granting of one additional foot of overall height. To summarize the discussion above, we have provided a table showing how the proposed boathouse with the variance granted compares with the existing. As the data shows, the proposed boathouse will be smaller overall (as indicated in green) in both real and relative terms, smaller in footprint, and smaller in volume. The only aspect that will increase (shown in red) is the height of the lowest portion of the roof. This is our request, and as discussed previously, this 1’-0” increase in grade is necessary to comply with the MCWD’s opening elevation requirements and provides greater flood protection. Feature Existing Proposed Delta Lowest Roof Height Above Grade (ft) 9'-2" 8'-8 1/4" -5 3/4" Highest Roof Height Above Grade (ft) 10'-7" 8'-11 1/2" -1'-7 12" Lowest Roof Height (ASL) 940.78 941.77 0.99’ Highest Roof Height (ASL) 942.19 942.03 -0.16’ Footprint (sf) 859 780 -79sf Enclosed Footprint (sf) 472 415 -57sf Roof area (sf, plan view) 1023 791 -232sf Volume (cf) 8616 6828 -1788ft3 89