2007-03-16 TSUNSTONE - Laserfiche WebLink

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Water is going to come over and under Kuakini Highway and into the property. We are going to collect it by excavation, creating a channel, then we are going to route it into a channel. Right now the water spreads over the property pretty wide range spreads over the property. I dont want to have my houses in it, so Im going to construct a channel. Its going to have a typical trapezoidal section; its maybe 50-foot wide at the base and may have 2 to 1 side slopes. But I know that the 2,500 cfs will flow down the channel, and Ill have above the maximum water surface 3-foot of what we call freeboard to make sure it doesnt overtop. Im going to carry the water. And this channel designed in section will be riprapped, it will be lined, it may even be natural if the rock has enough integrity to it. And Im going to carry it down through the property, and the channel will meet the County design standards. When I get down to the portion where it leaves off the property its in a channel, moving fast I want to make sure that Im not passing on this problem down to the property below. So Im going to widen out the channel at the bottom. Im going to create a control structure. A control structure is basically an engineering device that reduces the flow; I can put impact barriers down there, I can put a basin wherethewaterdrops,whereIdroptheenergyintheflow.AndthenImgoingtoputina culvert, and Im going to spread the water out underneath the culvert. So when the water flows, leaving my property, its going to match the exact same conditions that the current FEMA flood mapping shows. If I dont do that, I cant do the channel and I cant have the property move forward. I know I have to do that. The County engineer knows I have to do that. The sections that we are doing at engineering techniques that we are going to be using are nothing new; they are very standard. But I just have to make sure that the width of my box culvert maybe has to be Im expecting its going to be 60 feet wide. It may have to be 70. But all I know is when it leaves my property, its going to match exact same flow characteristics as what the FEMA floodway shows when its not developed. Now the way we are developing this scheme is not revolutionary or its not new just for the SunStoneproperty.AliiParkwayhasbeenafeaturethatalotofresidentsinKona,thePlanning Department and Public Works have been looking at for a long time. When Alii Parkway is built, and it comes along over here, Alii Parkway is raised. Guess what. You know all the water that was coming down from this FEMA floodway? It has to get under Alii Parkway. Guess how its going to get under Alii Parkway. Its going to get under utilizing culverts, exactly like Im describing. The reason Im using those culverts is I went back and Im looking at what Alii Parkway is doing, and trying to model as closely the same technique as the Parkway is using. Number one, so when the Parkway comes in, we made the commitment to try to assist in the development of the Parkway. We are using the same engineering techniques that the Countys design engineer is using for that section of the Parkway to handle the drainage section of it. Now weve agreed -. The studies that we are talking about to do these you know, I can give you terms we use: HEC-1 analysis, HEC-RAS analysis, they are computer models that we use. Trust me. They are very tedious and it takes a lot of work. We can do them; we can have them as part of an EIS. But again I mean as far as this Special Management application, but very clearly in the narrative that I prepared for Greg, I very clearly stated the techniques we are going to do, how we are going to carry the water through. And Im committed to doing it, or to be honest with you, Curt DeWeese is not going to be able to do anything on his project until I get the drainage study thats approved. So the concepts and techniques we are doing are very standard and they are very straight forward. And by the time Im done, its going to be about that thick. But Im still going to do the exact same things as Ive shown to everybody. 28EXHIBIT C