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Chapter 10:Hazard Analysis—Floods <br /> z-- <br /> �4 HAWAII <br /> 3_ <br /> •5 k - _ <br /> f' <br /> f{ t <br /> 5 . <br /> ll � <br /> }I <br /> ?III <br /> N .1.11-1.2G�2,C•1-2273.01-3.7a■�51-5,06�SA1-6.59 <br /> .1�1-1.d6�2.21-2L'�3.51-SA6■6.01-fi.50 <br /> 0 1A1-1.60EI 2.11-20=I]1.01-1.50 6.51-7.00 <br /> ■1-fi1 AM[]2.61-2a9 1.51-SAD 7.01-7.50 <br /> 0 1-81-20002.E1-&CO S01-5.967.51-8.00 <br /> Figure 10-5. 100-year return period 1 hour rainfall for Hawaii Island <br /> No district on the island is immune from rainfall flooding hazards. In some of the districts <br /> flood hazard areas are difficult to delineate due to the lack of defined drainage ways. The fol- <br /> lowing provides a summary profile for each district:53 <br /> • Puna. <br /> The climate of the Puna District varies considerably from the rocky shoreline to the rain <br /> forest areas in the upper elevation. Rainfall amounts are generally heavy and most of the <br /> district receives over 100 inches per year. <br /> The district is subject to heavy rainfall and there is record of severe flooding. Historically, <br /> flooding along the Belt Highway and the highway from Keaau to Pahoa had been the most <br /> prominent problems of the district. However, highway improvements have done much to <br /> alleviate the flooding on the roadways. Currently, the lack of development and the <br /> extremely permeable soils have helped to minimize major flooding and damage to life and <br /> property. However, as the amount of development increases within the district, flood <br /> problems will also increase. Furthermore, the conversion of land historically planted in <br /> 53 Hawaii County General Plan,2005. <br /> 10-9 Hawaii County Multi-Hazard Mitigation Plan <br />