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LTC 286-2011 Flooding on October 30, 2011 MIAMI BEACH OFFICE OF THE CITY MANAGER NO. LTC #( 286-2011 LETTER TO COMMISSION TO: Mayor Matti Herrera Bower and Members of the City Commission C= FROM: Jorge M. Gonzalez, City Manager° ,-- DATE: November 7, 2011 feLL < {_ SUBJECT: Flooding on October 30, 2011 , The purpose of this Letter to Commission is to provide you with information on the extents flc&ding within the City due to the rains from October 28 through October 31, 2011. ca Rainfall Totals Per the NOAA National Weather Service, the City experienced 11.70 inches of rain over these dates. The rain gauge on the roof of City Hall recorded 10.42 inches of rain over a 56 -hour period beginning at 10:00 pm on Friday, October 28 and ending at 6:00 am on Monday, October 31 st. The - . total at this gauge includes 0.42 inches of rain between 10:00 pm and midnight on Friday, 1.37 inches of rain on Saturday with over 1 inch of that total falling after 7 :00 pm, 6.30 inches of rain on Sunday, and 2.33 inches of rain between midnight and 6:00 am Monday morning (Attachment A). The rainfall event fell between the 5 -year 72 -hour storm that has a total rainfall of 10.2 inches and the 10 -year 72 -hour storm that has a total rainfall of 12.5 inches. This rainfall also coincided with the autumnal high tides that approached 3.33 feet Bay Datum. These tides are approximately one foot higher than typical high tides, which are around 2.38 feet. Flooded Areas Certain areas of the City had experienced nuisance flooding like ponding in driveways and birdbaths at the edge of the street...Several other areas experienced more severe flooding. These include: Middle North Bay Road centered on 52 Street • Meridian Avenue between 23r and 28 Streets • Prairie Avenue between 23 and 28t Streets r • 28 Street between Prairie Avenue and Royal Palm Avenue' • Fairgreen Drive immediately north of 28 Street • 6000 Block of Alton Road • 800 Block of South Shore Drive • Sunset Islands — isolated locations Middle North Bay Road This area experienced severe flooding due to a collapsed FDOT outfall at 52 Street and North Bay Road. The Operations Division of the City Public Works Department responded with crews, trucks, and equipment and had the area drained by Monday evening. FDOT has awarded a contract to repair the outfall and is anticipating a construction start date during the, month of November with completion by mid - December. The City is also expediting the construction of improvements on Middle North Bay. Road to the south of 52 Street. These improvements will include regrading swale, raising sidewalk, and a new inlet with piping (Attachment B). LTC - Flooding on October 30, 2011 November 7, 2011 Page 2 of 3 Golf Course Overflows The remaining areas that experienced flooding were due to overflows from adjacent golf courses. All of the golf courses in the City had stormwater - runoff from their properties either onto adjacent streets or adjacent properties. The Bayshore Neighborhood had several areas that flooded due to overflows from the Miami Beach Golf Course and the Par 3 Golf Course. These include Meridian Avenue, 28 Street and. Prairie Avenue between 23 Id and 28 Streets, 28 Street between Prairie Avenue and Royal Palm Avenue, and Fairgreen Drive :north of 28 Street. The La Gorce Country Club overflowed onto Alton Road, and the Normandy Shores Golf Course was reported to have overflowed to a property on South Shore Drive. Long -time City employees do not recall a storm event where all the golf courses overflowed their boundaries. The lakes on the Miami Beach Golf Course overtopped their banks due to an obstruction. in a discharge structure that provides for controlled stormwater runoff. As a result, the lake levels rose and flooded Meridian Avenue, which has a stormwater system that is interconnected to the east side of the golf course (Attachment C). Similarly, Prairie Avenue, 28 Street, and Fairgreen Drive received runoff from the Par 3 Golf Course. Both streets have drainage that is interconnected to the golf course (Attachment D). The La Gorce Country Club overflowed through properties located at 6025 and 6035 Alton Road (Attachment E). A swale on the south side of the Normandy Shores Golf Course also was reported to have overflowed onto a property at 831 South Shore Drive (Attachment F), although.it appears that the swale system functioned properly. While the La Gorce drainage system is private, the City is verifying that the stormwater system at Normandy Shores is unobstructed. Sunset Islands The eastern portion of Sunset Island II and the southwestern portion of Sunset Island III had some minor flooding due to catch basins that were obstructed by landscape debris such as palm fronds, mulch, and leaves. City crews cleared the catch basins on Sunset Island II while the debris was removed by a homeowner on Sunset III. Response to Flooding The flooding at La Gorce and Normandy Shores were contained`. However, the Public Works Operations staff worked .through the weekend and all day Monday relieving the flooded areas on Middle North Bay Road at 52 Street, Meridian Avenue, Prairie Avenue, and Fairgreen Drive. In addition to the crews, four vaccon trucks and two 4 -inch pumps were .deployed to the sites. Staff is also modeling a redundant system for Prairie Avenue between 23 rd and 28t Streets. That area has been proposed to drain to the proposed lake on the Par 3 Golf Course. A new redundancy will hydraulically connect that section of road to the pump station on .Prairie Avenue at Dade Boulevard. Similarly, Fairgreen Drive and its surrounding area is being modeled to determine if it is feasible to discharge stormwater from these streets to the proposed Par 3 lake. Staff is proposing to replace the discharge structure within the Miami Beach Golf Club with one that is less likely to become obstructed. Finally, staff is investigating the potential runoffs from Miami Beach High School to determine if that site contributed to the flooding. Neighborhoods with Stormwater Improvements It is important to note that the neighborhoods that have received recent stormwater improvements ` performed well. These include Normandy Shores, Normandy Isle, Nautilus, 44 Street, Prairie Avenue south of 23 Street, and Washington Avenue. j LTC - Flooding on October 30, 2011 November 7, 2011 . Page 3 of 3 If you have any questions, please feel free to contact me or Fred Beckmann, Public Works Director, at extension 6012. Attachments A. Rainfall data B. Photo of Middle North Bay Road C. Photo of.Miami Beach Golf Course D. Photo of Par 3 Golf Course E. Photo of La Gorce Country Club F. Photo of Normandy Shores Golf Course -D B /IQfRWS F: \work \$ALL \(1) EMPLOYEE FOLDERS \Rick Saltrick \LTC's \LTC for flooding of October 30 2011.doc f ATTACHMENT A O a � I I I q t o o o o o 0 0 o o o o 0 0 0 o 0 o o o o o 0 o o o o 0 0 o 0 o o 0 0 0 0 o 0 0 0 o O o 0 0 l0 r - 0) •r l a-) 1 0 0 0 0 O O O 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 C) Q 0 M - -I 4; b(d I . . . . . . . . . . . . . . . . . . . . . . . . . . . . _C a a 1 0 o o o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o d' o I g I o o 0 0 0 o o o 0 0 o 0 0 o 0 o o o o o 0 0 o o 0 o 0 0 0 o 0 o 0 0 0 0 0 0 o 0 0 o o o H w o Ln N -ri 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (M O .� . p', I O O O O O O O O O O o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ` I I I M ;1' rA ri d' O d' I` M r-i M DD d' M M M M O M N L(1 C- N C- 1,0 00 M M M M M M r-1 O M to M M Ln C� 00 N N 01 Lf'I Ol C� Ol I C1 N N N H O of M 0 0 0 0 0 0 r-i N N m M d• d' M M N r-i r-i O 00 I` Ln Ln rn cn M M Ln l0 LC) Ln d' Ln I` C` lD I` to I` oo yi 1 Ol 0) M M 61 Ol 00 m M M M M M M ON Ol 0) 0l Ol of 0) dl Ol Ol Ol Ol Ol 00 00 00 00 CC) CO CO CO 00 00 OD 00 00 00 OD 00 00 00 00 00 00 . 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