284 
PACIFIC SCIENCE, Vol. VII, July, 1953 
BEACH 
O 0 20 40 
' ' ' 
Fig. 7. Contour map of pond 6 showing depth in feet and location of station 11. 
it longer than it can on an open ocean coast. 
Because of the small amplitude of the lunar 
tide in Hawaii and because of the great in- 
fluence of winds upon the tide in Kaneohe 
Bay, it is 'doubtful if the present data will 
permit the accurate establishment of either 
the zero tide line or the time differential with 
Honolulu tides. 
However, for purposes of comparison an 
average zero tide line and a time differential 
were determined. Readings in the diurnal se- 
ries of observations were taken every 15 min- 
utes at the expected times of high and low 
water. The average zero tide reading was sub- 
tracted from these, and the corrected readings 
were then used in plotting and drawing the 
diurnal tidal curves for Kaneohe Bay (Fig. 9). 
In the first three sets of curves, interest was 
directed mainly to comparing the curves— 
tidal amplitudes as well as the correspondence 
of high and low waters. Hence, the initial 
high or low water of Kaneohe Bay and Hono- 
lulu were made to correspond with regard to 
time. The Kaneohe Bay tidal curve for the 
December series fitted the Honolulu curve 
poorly, especially with regard to correspond- 
ence of high and low waters. This was prob- 
ably the result of stormy weather with variable 
winds during the period studied. The April 
and August series compared a little more fa- 
vorably. The last set of curves was drawn 
mainly to compare the time differential be- 
tween Kaneohe Bay and Honolulu. The April 
tidal curves were chosen for this comparison 
because they displayed the best fit of the 
three observations. The average time differ- 
ential in this series was 1 hour 24 minutes, 
whereas the average time differential as de- 
termined in the study was 1 hour 50 minutes, 
and the time differential between the theore- 
tical Honolulu tide and that of Waikane, 
Kaneohe Bay, the closest reference station, 
is 1 hour 35 minutes. 
STATION 7 O 
Fig. 8. Contour map of pond 4 showing depth in 
feet and location of station 7. 
