Local Interval = GI - (0.069 * L)
GI je Greenwich Interval
L je longituda
The Lunitidal Interval is the average time difference between when the moon passes over the Local meridian or Greenwich meridian and the following high or low tide. Generally, the manufacturers of such items use the Local Interval for their calculations. Our office does not track or maintain the Local Intervals, we calculate and track the Greenwich Intervals for various locations. This information can be found in the ‘Water Level Observations’ section of our web site under the Accepted Datums heading.
The Greenwich Intervals we provide can be converted to the Local Interval using the following formula:
Local Interval = GI - (0.069 * L)
Where L is the longitude for the location in degrees. West longitudes are positive; East longitudes are negative.
Example: 122 degrees 23.7 minutes west would be 122.395 degrees. (23.7/60 = 0.395) Longitude for a station is available from the Accepted Datums page by using the link provided for further station information. GI is the Greenwich Interval. To calculate the High Tide Local Interval, use the Greenwich Mean High Water Interval in Hours from the Accepted Datums page. To calculate the Low Tide Local Interval, use the Greenwich Mean Low Water Interval in Hours. Some products will require the Local Interval to be a positive number. You can convert a negative interval to a positive by adding 12.42 to the result. For example, if your interval calculated to be -4.11 you could also use
8.31 (-4.11 + 12.42 = 8.31).
MHHW 8.18 Mean Higher-High Water
MHW 7.45 Mean High Water
DTL 5.49 Mean Diurnal Tide Level
MTL 5.58 Mean Tide Level
MSL 5.56 Mean Sea Level
MLW 3.71 Mean Low Water
MLLW 2.81 Mean Lower-Low Water
GT 5.37 Great Diurnal Range
MN 3.74 Mean Range of Tide
DHQ 0.73 Mean Diurnal High Water Inequality
DLQ 0.90 Mean Diurnal Low Water Inequality
HWI 5.01 Greenwich High Water Interval (in Hours)
LWI 11.07 Greenwich Low Water Interval (in Hours)
Maximum 10.30 Highest Water Level on Station Datum
Max Date 19721220 Date Of Highest Water Level
Max Time 00:00 Time Of Highest Water Level
Minimum 0.60 Lowest Water Level on Station Datum
Min Date 19710126 Date Of Lowest Water Level
Min Time 00:00 Time Of Lowest Water Level
;D
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