TABLE B.31 RAINFALL-COLLECTION RESULTS Collections were made In the trays of the OCC' 8 and AOC,' s on the standard platform of the LST-611 (Station D, Figure A.1) while the ship was berthed at the San Francisco Naval Shipyard, Hunters Point (No.24). Simultaneously, collections were made in two rectangular arrays of 12 identicaltrays located at the end of the adjacent pier and in a flat unobstructed area on the ground about 2,200 feet northwest of the ship. Winds were measured continuously on the tops of two buildings in the area (Nos. 815 and 511) and accompanying rainfall measurements were made on one (No. 815); a few readings were made with a hand-held instrument on the pilot house of the ship. At regular intervals the contents of the trays were emptied directly into a container graduated in milliliters; all values for a given array were later averaged and standard deviations computed. Weighted-average wind velocities were calculated by averaging the separate wind measurements, assigning weights to the different intervals on the basis of the parallel rainfall measurements, and averaging the resulting values. Rainfall catch ml/2.60 ft? Weighted Average Platform Array (LST-611) Rainfall Period Non-Platform Array LST Average LST Maximum Wind Velocity To Knots Max Average From Degreea Min Ground Pier Ground Ground 4/17 4/17 5/1 5/8 5/8 5/9 5/11 5/14 5/14 5/20 0130 1820 1400 1250 1830 2300 0205 1900 0930 1000 0300 1030 0930 3/29 4/15 4/16 4/17 4/17 5/2 5/8 5/9 5/9 6/13 5/14 5/14 §/20 0315 0800 1900 1400 2130 0130 0335 0030 1130 0700 0920 1100 2000 200 210 170 220 160 200 180 190 180 180 260 270 145 to 010 * No value available. 1 Missed beginning of rainfall. t Pier value used for ground average. 26 13 15 ll © 3 3/29 4/13 4/16 a oo BLz Average 10 450 397 150 525 1,740 500 540 150 65 110 235 235 1,970 520 910 385 720 2,540 760 805 410 240 375 295 320 2,900 4834 50 5514 40 2524154 5914188 2,0204520 6174264 620 + 255 2634278 1454143 2204201 2544 46 2624 53 2,3074919 Average 499+ 25 4704 10 * 1,418 4 242 634+ 60 5052116 345f 9224131 2424145 2,6844145 8522143 8134120 7592105 807+ 84 5254 87 378+ 68 71444167 2084107 3554315 248% 98 2964 55 283+ 55 2002 14 2834 68 4,2204381 3,752+4358 Mean Average 0.968 40.111 0.38940.072t 0.3974 0.246 0.641 40.223} 0.837 40.221 0.724 40.333 0.8174 0.354 0.501 4 0.536 0.6974 0.775 0.620 + 0.790 0.858 + 0.223 1.310 + 0.280 0.547 40.223 = 0.7162 0.402 Average 1.042 4 0.052 0.642 40.1107 0.6074 0.057 0.781 40.1113 1.05340.063 _ 0.892 +0.150 0.998 4 0.138 1.085 + 0.180 1.15440.594]} 1.056 + 0.937 0.99740.185 1.6004 0.112 0.6874 0.062 0.969 + 0.327