COM 0826.000 1996-1998 - Laserfiche WebLink

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{ 1. Drainage The US Corps of Engineers' Flood Insurance Rate Map (FIRM) designates most of the project site to be located in Zone X, areas outside the 500-year flood plain. However, there is a portion that is designated AE, areas within the 100 year flood. This is a part of the Waiaha Drainageway. In conjunction with the existing 5-acre subdivision plan, construction plans were prepared and subsequently approved by the County. The approved plans reflect a drainage easement that begins near the northern, mauka boundary of the subject parcel and eventually bisecting the parcel. (See Figure 4). The applicant's consulting engineer is now working with the County Department of Public Works to relocate this easement to run along the northern boundary of the entire parcel. It should be noted, however, that within the project area (14+ acres), the drainageway does not significantly affect the proposed lots. As such, drainage systems can be developed at the time of subdivision review to address the AE designation of the FIRM map. 2. Tsunami Hazard As the site is located over L6 miles from the ocean, it is located outside of the Civil Defense's Tsunami Evacuation Zone. 3. Volcanic and Earthquake Hazards The United States Geological Survey (USGS) classifies the area as Lava Flow Hazard Zone 4, on a scale of ascending risk 9 to 1. The populated area of Kailua-Kona also fall in this category, while the City of Hilo is classified Zone 3. There is very little that can be done to mitigate this situation and reflects an ongoing threat to all residents and businesses in these areas. The entire island of Hawaii falls within Earthquake Zone 3, according to the County Building Code. As such, certain structural requirements will be needed and taken during the building permit process to address this seismic hazard. 5