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2007-03-16 TSUNSTONE
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2007-03-16 TSUNSTONE
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scenario showing what the existing conditions are and that what we are proposing to do in <br />respect to proposed condition, so youll have a pretty full picture of the overall situation. <br />The project this is where Im going to start walking around the project is bounded by two <br />existing FEMA floodways. Youve seen those like AE Zones or Flood Zones on the map. Im <br />going to come over to the site plan. And on the south side of the property there is an existing <br />FEMA floodway; its called Waiaha Drainageway Splitflow No. 2 its how they identify it on <br />FIRM mapping. That shows an area that mapping and drainage and hydrology studies have <br />shown carries a relatively significant flow of water. Those drainageways are usually analyzed so <br />we know what the 100-year flow is. In this particular drainageway on this side, FEMA floodway <br />projections are that the stream flow is 2,500 cubic feet per second thats the term we use in <br />drainage analysis. To put that in perspective when you have your little catch basin out on the <br />street and you see the water running down the side of the gutter into the catch basin, thats <br />maybe 4 cubic feet per second. You know, so we are talking a very large amount of water that <br />willcomedownthesideoftheproperty.Onthenorthsideofthepropertywealsohavethemain <br />Waiaha Drainageway; that carries a 100-year stream flow in the neighborhood of 7,500 to 9,000 <br />cubic feet per second. Now these events are events that occur once every 100 years. So most <br />people whove lived over here havent even seen any water really cross Alii Drive, or very minor <br />particular cases but nothing like the 2,500 cfs we are talking about. But that is an existing <br />condition. The water comes from the above, comes over and under Kuakini Highway, comes <br />down through the property and continues, goes across Alii Drive and goes out into the ocean. <br />Its going to occur whether the SunStone property is built, its going to occur whether Alii <br />Parkway is built; its going to occur. Thats the existing drainageway, and thats whats going to <br />occur. The same thing occurs over here. There is nothing this project will do to it or against it <br />which will decrease or increase what the flow of the particular drainageway is. Its an existing <br />condition. <br />There are Im going to be point-blank with you there are structures which are smack dab in <br />the middle of the FEMA floodway. And they have been built on time cause FEMA floodways <br />have been only in existence since 1980. What happens if this project never gets built and you <br />have that storm the 2,500 cfs comes down the road? Well, thats why FEMA as an agency <br />maintains the practice; you get one flood and if you loose your property, they will give you <br />insurance but you cant build there again. So I mean thats the long-term situation what would <br />happen in those particular cases regardless of what development goes on right now. <br />SunStones property is looking at -. Now coming into the property and doing development of <br />that, we have obligations, or I as the civil engineer, as I design have obligations to make sure <br />that I meet and achieve these design standards of FEMA, the design standards of the Flood <br />Insurance Rate Map System and the design standards of the County of Hawaii, their drainage <br />standards. Whatever I do cannot violate any of those standards. I just want to give you that as a <br />premise and saying we are complying with every regulation that we have that is appropriate for <br />drainage. Now what we are going to do -. Water comes over the -. For the 100 -. Like I say, I <br />think its really important to recognize it; we are putting in a structure thats going to collect, <br />maintain and confine the 2,500-cubic foot per second storm. But probably in all of our life times <br />and maybe even your childrens life time, you know, you may not see water flowing in it. But <br />when we design for civil engineering standards, these are standards that we have to design to. <br />27EXHIBIT C <br /> <br />
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