FLOOD04656

• County: Statewide
• Community: United States
• Basin: Statewide
• Title: Summary of Floods in the United States During 1965
• Date: 1/1/1970
• Prepared For: US Department of the Interior
• Prepared By: Federal, State, and Local Agencies
• Floodplain - Doc Type: Flood Documentation Report

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FLOODS OF 1965 IN THE UNITED STATES

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12.50. Frisco City

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EXPLANATION
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Flood-determination point
Num.b6T~to
that in table 34
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~recipitation station
NumbeT indicatmJ pruipitati<m, in i?iCkes,
jortlu;periodSept.29-Oct.l,1965

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20
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30 MILES
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FIGURE 45.-Location of f1.ood-determination points and precipitation sites, floods
of September SO-October 3 in southwestern Ala'balll1L

in June 1900. The Weather Bureau reported that 8,50 inches fell
during a 31h-hour period iu the early morning of September 30. A
total rainfall of 17.20 inches was recorded at the downtown station
during the 3-day period.
Other notable rainfall amounts for the 3-day period were 8,13 inches
at Coden, 7.36 inches at Robertsdale, 9.23 inches at Bay Minette, and
12.50 inches at Frisco City. Rainfall amounts for these and several
other locations are shown in figure 45,
Continuous records of rainfall were obtained by the Geological
Survey at two rain gages on Montlimar Creek, about 5 miles west of
the downtown area. Total rainfall at each station checks closely with
the total measured in downtown Mobile; the continuous records can
be used to illustrate rainfall frequency and duration for selected time
periods during the storm.

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S~RY OF FLOODS

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A mass curve of rainfall for the gaging station on Montlimar Creek
(sta.8) at D,S, Highway 90 is shown in figure 46. ~aximum rainfall
amounts and intensities for selected durations durmg the storm are
listed in table 33, and the intensities are plotted on a rainfall inten-
sity-duration-frequency diagram for Mobile (fig. 47),. The 24-hour
rainfall of 15.9 inches greatly exceeds the 100- year ramfalL

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SEPTEMBER 29

SEPTEMBER 30

FIGURE 46.-Accumulated rainfall for September 29-30 at Montlimar
Creek at U.S. Highway 90 at MObile, Ala.

TABLE 33.-Rainfall duration-intensitY-freq'lfency data for stO'T'1fl- of September 29-30
at Montlimar Creek at U.S. H1,ghway 90 at Mob1,le, Ala.

Duration Mamnum Approximate
(minutes) Rainfall (inches) intensity reCUIT8nce
(inches per hour) interval (years)
" 1.1 M 2
30 1.8 3.8 4
80 3.1 3.1 15
120 U 2,0 20
180 6.3 2.1 1_
1,440 15.9 ,68 100+

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