2004-07-02 TDJSMLL - Laserfiche WebLink

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in, and we have to do specific studies, and thats called the Drainage Study. So the total water volumes for this little drainage area is already accounted for in the floodway, and Yen can confirm this. But because of that, we wanted to discuss the two things a little separately. Well talk about the floodway first and how we get there. And then well talk about the drainage and the drainage studies that have to be done to look at the localized drainage issues related to the construction of the property, the creation of impervious sites, and the like. So with that, I would like to ask Yen to talk a little bit about, first of all, how the FEMA floodways are designated and what do they mean, and then how development is allowed. Cause we are proposing to do fill and actually to improve per the record. There has been review and approval of the flood study and even the drainage study already by the Department of Public Works to allow the fill. And, again, Yen will go through the process as to what we have to go through to get there and give a little bit of overview as tohoweventheFEMAdesignatedthesefloodways.Yen? FANG:Thankyou.First,Idliketoclarifysomeofthedefinitionsof flood plain versus flood fringe versus floodway. Generally speaking, the entire shaded area, the blue shaded area, is called the flood plain, like everybody knows. And then the floodway, the flood fringe is between the 100-year boundary, okay, and the floodway. So its the, its the -. MOORE:Why dont you go up there, if you want to -. FANG:Okay. Again, were referring to the flood study for Takase. Flood fringe is between the dash line, which is the floodway, and the flood boundary. So its in this region, and the floodway is in here. How we determine floodway versus flood fringe is if you look at river a thats, say, about this wide, and if you start squeezing in by filling both sides in -. MOORE:This is theoretically, by the way, -. FANG:Yeah, if its filled in and, as an encroachment, the water will rise because, you know, the cross section reduces. The water will rise and itll rise to a point of one foot, and that limits the floodway; and thats how we come up with that line. So the floodway is a calculated width. Its not really, you know, a physical, you cannot really see it in the field because, you know, its very hard to do that. And to the FEMA, the Federal government allows us to develope in the flood fringe. MOORE:If I can, before you go there, just in terms of the total water amounts, can you briefly determine how the process of FEMA uses to determine what water use to model. 4