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<br />ElO <br /> <br />6000 <br /> <br />S~Y OF FLOODS <br /> <br />- Pre"ious maximum <br />L/ '- <br /> <br />FLOODS OF 1.965 IN TEE UNITED STATES <br /> <br />. The storm of February 3-4 that struck Maui also caused heavy rains <br />in Oahu on the windward slopes of the Koolau Range between Punaluu <br />and Kahaluu (fig. 4). At Waiahole, 2,6 inches of rain fell in a series of <br />showers on February 3. In the first 4 hours of February 4, 7 inches of <br />rain fell, and by 0800 hours 11.5 inches had fallen. The total. storm pre- <br />cipitation at Waiahole was 18.17 inches, and at Kahana it was 18.50 <br />inches-both stations are at an elevation of about 800 feet. Estimates <br />from storage gages between the two stations suggest that storm totals <br />may have reached 24 inches. Rainfall during a 24-hour period near the <br />shore in the KaHua area was .about 2 inches, and the amount increased <br />rapidly inland, Rainfall west of the Koolau Range decreased rapidly <br />and was about 1 inch in the western part of Oahu, <br />Some of the most intense rates of runoff (to;ble 4) ever recorded on <br />windward Oahu occurred on February 4, Makawao Stream (sta, 17) <br />reached a stage 3 feet higher and a peak discharge 2.8 times as great as <br />recorded previously. A hydrograph of the brief but intense discharge <br />is shown in figure 5. Streams in the Manoa and Palolo valleys crested <br />at the highest stages recorded since 1921, <br /> <br />5000 <br /> <br />" <br />z <br />o <br />u <br />ill 4000 <br />'" <br />~ <br />Q. <br />t;l <br />~ <br />~ <br />u ~ooo <br />a; <br />=> <br />u <br />~ <br />"' <br />~ 2000 <br />0< <br />J: <br />U <br />00 <br />i5 <br /> <br /> <br />1000 <br /> <br />o <br /> <br />0000 <br /> <br />0600 <br /> <br />1200 <br />February 4 <br /> <br />1800 <br /> <br />Ell <br /> <br />FIGURE 5.-Discharge 'Of Makawao Stl:'eam nea.r Kailua, Oahu, Hawaii, <br />February 4. <br /> <br />30 <br /> <br />TABLE 4.-Flood stages and discharges, February, in Oahu, Hawaii" <br /> <br />No. <br /> <br />Stream and place of determination Drainage <br />~~ <br />(sqmi) <br /> <br />1 WaikakaJaua. Stream near Wahiawa.__ <br />2 KipapaStIeamnearWahia,w3_____n_ <br />3 Waia.w& Stream near Pearl City_______ <br />4 NorthRalawaStrea.mnearAieanoho <br /> <br />EXPLANATION <br />.32 <br />Flood-determination point <br />Nu:mbe"corre~to <br />t/uztintable... <br /> <br />6 Kalihi Stream near Honolulu. __ _ __ ___ <br /> <br />6 Kalihi Stream at KalihL......__...._. <br />7 Nuuanu Stream below reservoir 2 <br />wasteway near Honolulu. <br />8 waolaniStrea.matHonolulu..,uhu__ <br /> <br />5 0 <br />I '" I I <br /> <br />5 MilES <br />I <br /> <br />FIGURE 4.-Location of flood-determination points, floods of Feb-ruary in Oahu, <br />Hawaii. <br /> <br />381_8490_70' 3 <br /> <br />Maximum floods <br />Gag, <br />Febrt18l'Y height <br />1965 (feet) <br /> <br />Known before <br />Februa.ryl96S <br />Period Year <br /> <br />6.96 1958-65m_ 1963 mm____ <br />4.29'i957=-M====--i963ummn=_ <br />n.___.._....___.... 4 <br />26.4 1953....65-... 1954 _mnm_ <br />, <br />3.45 -i9zs:.33:umi932"_u___~m <br />1953-%. <br />4 <br />2.61 -1914;1917':---1930--._.___.__. <br />... <br />5.18 'iooo:65===="i960" mmn=' <br />.u_.u.......n.... 4 <br />3.35 1918-65.... 1921 u..__H__ <br />n_un_..._.____u_ 4 <br />1.28 1958-65m_ 1963 m___~___ <br />4 <br /> <br />DIs- <br />- <br />(m) <br /> <br />16.50 <br />11.55 <br />12.29 <br />9.60 <br />19.ZT <br />15.37 <br />,>.3, <br />12.J3 <br />13.81 <br />10.0 <br />8.0 <br />8,02 <br />&74 <br />5.09 <br />a.. <br />~90 <br /> <br />4,830 <br />1,420 <br />5,680 <br />2,480 <br />16,900 <br />10,400 <br />',650 <br />~280 <br />12,400 <br />2,320 <br />',350 <br />5,910 <br />a '90 <br />851 <br />~"JO <br />712 <br />