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LOCATION HYDRAULIC STUDY FORM * <br /> <br />Dist. 12 Co. Orange Rte. P.M. <br />EA 15-6827 Bridge No. 55C0513 <br />Floodplain Description: <br /> Santa Ana River Floodplain <br /> ______ <br /> <br />1. Description of Proposal (include any physical barriers i.e. concrete barriers, <br />soundwalls, etc. and design elements to minimize floodplain impacts) <br /> <br />City of Santa Ana proposes to widen the Fairview Street Bridge over the Santa Ana River <br />in order to accommodate 6 lanes; 3 lanes in each direction. <br /> <br />2. ADT: Current 38,544 (2017) Projected <br /> <br />3. Hydraulic Data: Base Flood Q100= 50,000 CFS <br />WSE100= n/a The flood of record, if greater than Q100: <br />Q= n/a CFS WSE= <br />Overtopping flood Q= CFS WSE= <br />Are NFIP maps and studies available? YES X NO <br /> <br />4. Is the highway location alternative within a regulatory floodway ? <br /> YES X NO <br /> <br />5. Attach map with flood limits outlined showing all buildings or other improvements <br />within the base floodplain. <br /> <br />Potential Q100 backwater damages: <br /> <br />A. Residences? NO X YES <br />B. Other Bldgs? NO X YES <br />C. Crops? NO X YES <br />D. Natural and beneficial <br />FLOODPLAIN VALUES? NO YES X <br /> <br />6. Type of Traffic: <br /> <br />A. Emergency supply or evacuation route? NO YES X <br />B. Emergency vehicle access? NO YES X <br />C. Practicable detour available? NO YES X <br />D. School bus or mail route? NO YES X <br /> <br />7. Estimated duration of traffic interruption for 100-year event hours: 0 <br /> <br />8. Estimated value of Q100 flood damages (if any) – moderate risk level.