HomeMy WebLinkAboutSubmittal-William E. Pino, P.E.-44— L
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E N G I N E E R I hl G
Residential Dwellings
Analysis:
The report prepared by Mr. VViebe does not address the issue of the residential
dwellings, specificaliy the various condominium buildings in the immediate area. We
contacted Mr. Wiebe at Daktronics to obtain additional information which it was
gracefully provided to us. The results of our engineering analysis indicate that 800
feet away from the signs, vertical illuminace (lighting) values of up to 0,40
footcandies can be obtained. The footcandle is the unit of measurement of
illuminance in a specific plane (direction). The best analogy to understand what a
fcotcandle represents is that tie light emitted by a full moon when at nadir (straight
above us), on a clear night, is equivalent to aoproximateiy one tenth of a footcandle,
Therefore, 800 feet away from the signs, the lighting levels are equivalent to having
four (4) full moons shinning at you or at your bedroom window. In addition to this
amount of light it is important to note that the signs will be emitting a constant color
changing scheme which will, results in additional offensive glare.
Conclusion:
It has been the experience of this engineer that any amount of lighting that exceeds
the lighting emitted by a full moon may be considered offensive to residential
occupants at night time. if in addition we add the color changing element, it would be
prudent to establish that the signs in question will produce offensive glare at the
residential dwellings when the lighting levels exceed half of a full moon or 0.05
footcandles during the night. From the data obtained from Daktronics, some areas
will be exposed to this lighting level as far away as 2,260 feet (almost half a mile),
which will include numerous condominium buildings in the area.
Recommendations:
Considering the passible adverse effects (offensive glare) of the lighting emitted by
the signs in some angles, it is the recommendation of this engineer to operate the
signs at night only until a prudent hour where the occupants of the nearby
apartments wilt not be under the effect of the lighting during normal sleeping hours. It
is important to note that offensive glare and normal sleeping hours are very
subjective and they vary from individual to Individual The City may want to consider
turning off the signs at 12 midnight and adjust the time depending on the public's
reaction.
Please let me know if you would Tike any additional information.
Best regards,
Main Street Engineering, Inc.
William E. Pino, P.E.
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7035E SW 47"Street Miami, Florida 33155
7el.: (305) 666-7450 Fax: (305) 666-2454
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Ra i e E u i� G
Miami, June 30th, 2010
Mark Spanioli, P. E.
Director of Engineering and Construction
City of Miami Community Redevelopment Agency
49 NW 5th Street, Suite 100
Miami, FL 33128
mspan(c�miamigov.com
Reference: Proposed City Square Signs
Mr. Spanioli;
We have reviewed the information provided to us related to the proposed LED signs to
be installed on top of the parking garage between NE 14th Street and N. Bayshore
Drive, Our analysis and conclusions are based strictly on the possible adverse effects of
the lighting emitted by the signs on Roads and Highways and Residential Dwellings.
Roads and Highways
Analysis.-
The
nalysis:The report prepared by Mr. Glen Wiebe, Commercial Engineer for the sign
manufacturer, Daktronics, is very elaborate and clear. The amount of light emitted by
the signs is considerably below the typical roadway and highway artificial lighting
currently installed in the area
Conclusion:
From the data shown in the report it Is our conclusion that the lighting emitted by the
proposed signs will not represent an adverse factor to roadway and highway users
neither at night nor day time.
Submitted into the public
record in connection with
item PZ.16 & PZ.17 on 07-22�10
Priscilla A. Thompson
City Clerk
70358 SVV 47'rStreet • Miami, Florida 33155
Tei.: (305) 666-7450 Fox: (305) 666-2430 i