Coastal Subsidence Study 2005 - Laserfiche WebLink

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From the data (Figure 3-6), there were four areas (marked by arrows) where water breached the roadway on that date. The thickness of the arrows is a rough indication of the magnitude of the breach. Note also that the inundation in some areas may have gone further in than the first row of houses mauka of Waiopae Road. However the mixing of water with tidal ponds, the limited access and thick brush prevented any significant determination for the more inland lots. Figure 3-6 - Inundation recorded on August 17, 2005 with the use of two satellite GPS units (RVR1 and RVR2). High Tide was 3.17 meters from NOAA tide charts. Wind speed was 6.6 meters per second and significant wave heights were 1.97 meters as measured from the ocean buoy southeast of Hilo. Arrows indicate where breaches in the road occurred. The width of the arrows is a qualitative indication of the size of the channel. The close proximity of the GPS units confirm the recorded position. For later discussion in this Chapter, only RVR2 will be utilized. The August 17, 2005 data was then compared with another high tide event on July 10, 2006 when the tide charts indicated a 3.13 high tide. This would be almost the same as the predicted tide for August 17, 2005 (3.17 high tide). It would be of interest to see how the extent of inundation changed over 11 months. Given that the July 10, 2006 high tide event was slightly lower, all things remaining the same, the inundation should be slightly less. 3.2 Field Trip – July 10, 2006 Although the contract for Kapoho called for only one site visit, two were made. On July 10, 2006 another field trip to the Kapoho Vacationland subdivision was made with Dennis Hwang, Dr. James Foster, his assistant technical helper Shanna Dacanay, and Hawaii County Planner Larry Brown. The purpose of this site visit was to 23