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. . . CEIOOQ06.0H2 1******************************************** . HEC-2 WATER SURFACE PROFILES * Version 406.2; May 1991 RUN DATE 09MAR06 TIME 15: 31: 55 ** * *** **** ** * *** **** * ****** *** ** ****...* * * ...*** 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 15:31:55 *************************************** Uoso 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 15:31:55 Version 4.6.2i May 1991 ************************************* THE FOLLOWING CHANGES WERE MADE DURING THE 2006 OXBOW LEVEE LOMRo ************************************************************************ FILE: CEI00Q060DAT THIS 2006 OXBOW LOMR CORRECTED EFFECTIVE MODEL: 1. COMBINES THE EFFECTIVE LOWER Q 100-, 50-, and 10-YEAR FLOODPLAIN MODEL (LOWQ990DAT) 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 DROP STRUCTURE/BOAT CHUTE LOMR AND THE 2005 (REVISED JANUARY 2006) REMOVAL ACTION LOMRo 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 0 4. CHANGED THE 87 IN FIELD 5 OF THE JP CARD FOR THE LINCOLN SPLIT FLOW CARDS TO 1000 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. NOW 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 DIVIDED FLOW PATH WILL RETURN TO THE MAIN CHANNEL UPSTREAM OF THE MULBERRY BRIDGE 0 THIS PROVIDES A MORE AUTOMATED AND CONSERVATIVE MODEL. 50 DELETED ALL OF THE SOD-YEAR DISCHARGE INPUT FROM ALL QT CARDS FROM THE EFFECTIVE LOWER Q 100-, 50-, AND 10-YEAR FLOODPLAIN MODEL (LOWQ990 DAT) SINCE 500-YEAR WATER SURFACE ELEVATIONS WERE NOT COMPUTED UTILIZING THIS CORRECTED EFFECTIVE MODEL 0 6. TRUNCATED THE LEFT OVERBANK GEOMETRY FROM THE GEOMETRY DATA OF CROSS SECTIONS 228117, 229322, AND 229477 DUE TO THESE AREAS NOT BEING HYDRAULICALLY CONNECTED TO THE MAIN CHANNEL. ...... * *... * * * *... *... *... ** * * ** * *............... *......... *...... * * *... * * * * * *... *...... *...... * **... * *... **... *............ * *...... ** ************************************************************************ ************************************************************************ THE FOLLOWING CHANGES WERE MADE DURING THE 2005 REMOVAL ACTION LOMR. ************************************************************************ FILE: RCUPR05. DAT THIS 2005 REMOVAL ACTION LOMR REVISED CONDITION MODEL: o 9MARO 6 15:31:55 9. INCORPORATES AS-BUILT TOPOGRAPHY FOR THE REMOVAL ACTION SITE THE 1-FT AS-BUILT TOPOGRAPHY FOR THE REMOVAL ACTION SITE WAS DEVELOPED FROM POST-PROJECT LAND SURVEYS CONDUCTED BY BY NORTHERN ENGINEERING IN JUNE 2005. GEOMETRY FOR THE FOLLOWING CROSS SECTIONS WERE UPDATED UTILIZING THE AS- BUILT SURVEY TOPOGRAPHY WERE APPROPRIATE; 229322, 229477, AND 2297570 ************************************************************************ ************************************************************************ FILE: CEUPR05.DAT THIS 2005 REMOVAL ACTION LOMR CORRECTED EFFECTIVE MODEL: 1. IS BASED ON THE REVISED CONDITION MODEL UPPER-RC.DAT PAGE Page 1 of 49 P:\COFC2003\10 - Oxbow Levee\LOMR\FinDisk (Final)\Appendix G\FEMA Models\Corrected Effective Models\CEl 00Q06.doc Created on 3/9/2006 3:33 PM