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. :I . . EXIOOQ06.0H2 1'* '* * *** *** * ** * ** * * * * ** * ** ** **** ****** * * * *... * ** . HEC-2 WATER SURFACE PROFILES Version 4.6.2; May 1991 RUN DATE 09MAR06 15:41:12 TIME * * *...... * *...... * *... * * *... *... *......... * * * * *......... * * * * * * **......... * * * x X XXXXXXX XXXXX XXXXX X X X X X X X X X X X X XXXXXXX XXXX X XXXXX XXXXX X X X X X X X X X X X X X XXXXXXX XXXXX XXXXXXX 09MAR06 15:41:12 *************************************** U.S. ARMY CORPS OF ENGINEERS HYDROLOGIC ENGINEERING CENTER 609 SECOND STREET, SUITE D DAVIS, CALIFORNIA 95616-4687 (916) 756-1104 *************************************** PAGE HEC-2 WATER SURFACE PROFILES THIS RUN EXECUTED 09MAR06 15:41:12 ************************************* Version 4.6.2: May 1991 ************************************* THE FOLLOWING CHANGES WERE MADE DURING THE 2006 OXBOW LEVEE LOMR. ************************************************************************ FILE: EX100Q06.DAT THIS 2006 OXBOW LOMR EXISTING CONDITION MODEL: 7. INCORPORATED PRE-PROJECT SURVEY INFORMATION FOR THE OXBOVl LEVEE PROJECT AREA LOCATED BETWEEN THE UPSTREAM SIDE OF THE LINCOLN AVENUE BRIDGE, CROSS SECTION 227437, AND THE DOWNSTREAM SIDE OF THE LINDEN STREET BRIDGE, CROSS SECTION 228637. THE 1-FT PRE-PROJECT TOPOGRAPHY DEVELOPED FROM ~BD SURVEYS CONDUCTED BY KING SURVEYORS, INC. IN APRIL, 2004 VIAS UTILIZED TO UPDATE THE LEFT BANK GEOMETRY FOR CROSS SECTIONS 227397, 227437, AND 228117. THE LEFT BANK OF CROSS SECTION 228117 WAS REPOSITIONED TO BE PERPENDICULAR TO THE FLOVl BETWEEN THE LEFT BANK STATION AND THE REPOSITIONED LINCOLN AVENUE LATERAl SPLIT FLOW WEIR SECTIONS. 8. CHANGED THE LEFT OVERBANK REACH LENGTHS OF CROSS SECTIONS 228117 AND 228637 DUE TO THE REPOSITIONING OF THE LEFT OVERBANK OF CROSS SECTION 228117. THE LEFT OVERBANK REACH LENGTHS FOR CROSS SECTIONS 228117 AND 228637 WERE CHANGED FROM 790 FEET AND 420 FEET TO 630 FEET AND 580 FEET, RESPECTIVELY. 9. REPOSITIONED AND UPDATED THE GEOMETRY OF THE TVlO LINCOLN AVENUE LATERAl SPLIT FLOW WEIRS LOCATED BETWEEN CROSS SECTIONS 227437 AND 228637. THE WEIR SECTIONS WERE REPOSITIONED AND THE GEOMETRY WERE UPDATED BASED ON THE 1-FT PRE-PROJECT TOPOGRAPHY AND SPOT ELEVATIONS DEVELOPED FOR THE OXBOW LEVEE PROJECT AREA BY KING SURVEYORS, INC. IN APRIL, 2004. 10. TRUNCATED THE LEFT OVERBANK GEOMETRY FROM THE GEOMETRY DAT}l. OF THE LINDEN STREET CROSS SECTIONS 228637 AND 228687 DUE TO THESE AREAS NOT BEING HYDRAULICALLY CONNECTED TO THE MAIN CHANNEL WITH THE EXTENSION OF THE LINC DIVIDED FLOW PATH UPSTREAM OF LINDEN STREET. ************************************************************************ ************************************************************************ FILE: CE100Q06.DAT THIS 2006 OXBOW LOMR CORRECTED EFFECTIVE MODEL: 1. COMBINES THE EFFECTIVE LOWER Q 100-, 50-, and la-YEAR FLOODPLAIN MODEL (LOWQ99.DAT) FROM THE 1999 TIMBERLINE ROAD LOMR AND THE EFFECTIVE UPPER Q 100-, 50-, and 10-YEAR FLOODPLAIN MODEL (UPPERQ.DAT) FROM THE ORIGINAL 1994 FEMA STUDY. THE UPPERQ.DAT MODEL WAS NOT UPDATED IN EITHER THE 2001 POWER PLANT DROP STRUCTURE/BOAT CHUTE LOMR OR THE 2005 (REVISED JANUARY 2006) CACHE LA POUDRE REMOVAL ACTION LOMR BECAUSE THE CHANGES ASSOCIATED WITH THESE LOMR' S DID NOT AFFECT THE 100-YEAR FLOW SPLITS. 2. INCORPORATES THE CHANGES ASSOCIATED WITH THE 2001 POWER PLANT o 9MARO 6 15:41:12 DROP STRUCTURE/BOAT CHUTE LOMR AND THE 2005 (REVISED JANUARY 2006) REMOVAL ACTION LOMR. 3. COMPUTES DISCHARGES FOR THE 100-, 50-, AND 10-YEAR SPLIT FLOW PATHS DEFINED BY THE SPLIT FLOW CARDS AND COMPUTES THE 100-, 50-, AND 10-YEAR WATER SURFACE ELEVATIONS FOR THE MAIN CHANNEL. 4. CHANGED THE 87 IN FIELD 5 OF THE JP CARD FOR THE LINCOLN SPLIT FLOW CARDS TO 100. THIS MODELING CHANGE WAS MADE DUE TO THE FACT THAT THE "HARD WIRING" OF DISCHARGES WAS NECESSARY TO ACCOUNT FOR FLOW IN THE MAIN CHANNEL AND THE LINCOLN DIVIDED FLOW PATH WHEN THE UPPER AND LOWER REACHES WERE SEPARATE MODELS. NOVl THAT THE MODELS HAVE BEEN COMBINED AND THE FACT ONLY A SMALL PORTION OF FLOW (APPROXIMATELY 4 CFS IN THE 100-YEAR PROFILE) DID NOT RETURN TO THE MAIN CHANNEL OVER LINCOLN AVENUE, IT IS ASSUMED THAT ALL FLOW SPILLED INTO THE LINCOLN PAGE Page 1 of 49 P:\COFC2003\10 - Oxbow Levee\LOMR\FinDisk (Final)\Appendix G\FEMA Models\Existing Models\EXI 00Q06.doe Created on 3/9/2006 3:42 PM