DRAFT REPORT TXDOT SH 183 MASTER DRAINAGE STUDY HYDRAULIC ANALYSIS OF ELM FORK OF TRINITY RIVER CROSSING AT SH 183 WITHIN THE ELM FORK WATERSHED FOR TEXAS DEPARTMENT OF TRANSPORTATION DALLAS DISTRICT CONTRACT NO. 18-045P5027 BY HALFF ASSOCIATES, INC. 8616 NORTHWEST PLAZA DRIVE DALLAS, TEXAS 75225 (214) 346-6200 July 2007 AVO 19474
I. General Existing Structure Description TxDOT SH 183 Master Drainage Study Elm Fork of the Trinity River The modeled portion of the SH 183 bridge spans approximately 1,530 feet over the Elm Fork of the Trinity River. The modeled bridge is located between two levees. The west levee is in the City of Irving and is maintained by Irving Flood Control District (IFCD). The east levee is maintained by the City of Dallas. The Elm Fork forms the city boundary between Dallas and Irving. The bridge is located approximately 1,800 feet from the Regal Row exit on SH 183. The total width of the existing bridge is 132 feet. Figure 1 shows photographs of the existing bridge. II. Hydrology and Existing CDC Hydraulic Model The existing conditions hydraulic model was created by the U.S. Army Corps of Engineers for Corridor Development Certificate (CDC) evaluations. Per the description in the HEC-RAS model, the last model update was in November 2006. The CDC model covers the Upper Trinity River including the Main Stem, West, Clear, and Elm Forks. Elm Fork cross-sections in the vicinity of SH 183 were drawn to the top of the levees. The CDC model was updated by the Corps using HEC-RAS Version 4.0 Beta. The same version was used for the current hydraulic analysis. Downstream Face of Bridge Upstream Face of Bridge at IFCD Levee Figure 1. Photographs of the SH 183 over the Elm Fork of the Trinity River The flows used in this hydraulic analysis are from the CDC model. No new hydrologic analysis was performed to compute flows. The flow file in the CDC model indicates that the flows are based on fully developed conditions in the watershed. The existing CDC model contains two separate RAS geometry files. One geometry file contains the geometry for the 1-yr to 100-yr profiles and the other file contains the geometry for the 500-yr and SPF profiles from the CDC model. The CDC model has separate geometries due to the hydraulic behavior of the Trinity River. Table 1 shows the discharges that were applied at the bridge location. DRAFT 1
TxDOT SH 183 Master Drainage Study Elm Fork of the Trinity River Table 1. Existing CDC Peak Discharges Peak Discharges (cfs) 10-YR 25-YR 50-YR 100-YR 500-YR SPF Ultimate Conditions Elm Fork of the Trinity River at SH 183 20,500 27,400 34,800 43,100 51,800 106,200 III. Revised Existing Hydraulic Analysis The hydraulic model from the CDC in the immediate vicinity of the SH 183 bridge over the Elm Fork was revised to incorporate data from 1978 Texas Department of Transportation (TxDOT) as-built plans which were verified by field reconnaissance. The existing model showed 23 sets of piers between the Dallas and IFCD levees which were 3 feet to 6 feet in diameter. From field reconnaissance, the number of piers was observed to be 26 and the size of piers was measured to be 2.5 feet with the exception of 4 sets of piers near the channel. The piers near the channel were measured to be 4 feet in diameter at the largest pier. The Manning s roughness values were also modified in the revised existing model based on field observations. Areas between the Dallas levee and the channel were assigned a Manning s n-value of 0.07 in the existing model. This roughness value was changed to 0.03 in the revised existing model because the vegetation in this area is mowed grass. The existing CDC model had a deck width of 130 feet whereas the aerial photo and as-built plans show the deck to be 132 feet wide. Table 2 provides a summary of water surface elevation comparisons between existing CDC and revised existing models for the 100-yr and SPF profiles. Table 2. Revised Existing Hydraulic Results 100-yr Water Surface Elevation Comparison River Station CDC Existing Elevation (ft) Revised Existing Elevation (ft) SPF Water Surface Elevation Comparison River Station CDC Existing Elevation (ft) Revised Existing Elevation (ft) 14648 424.95 424.94 14648 437.44 437.41 14545 424.94 424.93 14545 437.43 437.40 14544 424.94 424.93 14544 437.43 437.40 Bridge Bridge 14411 424.90 424.91 14411 437.37 437.36 14317 424.89 424.90 14317 437.36 437.35 14062 424.89 424.90 14062 437.35 437.36 DRAFT 2
IV. Proposed Bridge Hydraulic Analysis TxDOT SH 183 Master Drainage Study Elm Fork of the Trinity River The proposed TxDOT highway improvements will add new frontage roads and replace the existing SH 183 bridge with a wider and higher bridge. The proposed bridge will be approximately 410 feet wide based on May 2006 TxDOT preliminary schematic plans. The proposed structure span will remain the same as existing conditions. However, the height of bridge above the channel will increase approximately 7 feet. The existing 26-2.5 foot and 4 foot diameter piers will be replaced by 12-6.5 foot width rectangular piers. Pier locations input into the model were taken from preliminary schematic plans where proposed bent locations are shown. New deck information was entered into the model based on top of road and deck height for the proposed eastbound frontage road. The eastbound frontage road deck information was used because it has the lowest low-chord elevation. Existing cross-sections upstream and downstream were deleted from the model and new ones were added to represent the proposed bridge in the hydraulic model. The new crosssections were cut using Corps 2-foot topographic data that was used in the existing CDC model. Flow lines of the new cross-sections were interpolated between existing crosssection flow lines. Geometry changes were made to both the 1-yr to 100-yr geometry file and 500-yr to SPF geometry file. The hydraulics of the proposed SH 183 bridge were analyzed using the same methods and procedures as the existing structure hydraulics. Table 3 provides a summary of water surface elevation comparisons between revised existing and proposed models for the 100- yr and SPF profiles. Per the results, the 100-yr is contained within the levees; however, the levees do not contain 500-yr and SPF profiles. Table 3. Proposed Hydraulic Results 100-yr Water Surface Elevation Comparison River Station Revised Existing Elevation (ft) Proposed Elevation (ft) SPF Water Surface Elevation Comparison River Station Revised Existing Elevation (ft) Proposed Elevation (ft) 15678 425.01 425.01 15678 437.49 437.48 14808 424.95 424.95 14808 437.42 437.42 14712 424.94 424.94 14712 437.41 437.41 Bridge Bridge 14253 424.91 424.91 14253 437.36 437.36 14062 424.90 424.90 14062 437.36 437.36 13962 424.90 424.90 13962 437.35 437.35 DRAFT 3
V. Conclusions TxDOT SH 183 Master Drainage Study Elm Fork of the Trinity River The water surface elevations from the existing, revised existing, and proposed models were compared for 100-yr, 500-yr and SPF profiles. Due to a decrease in roughness values and size of piers, the water surface elevations were calculated to be slightly lower for the revised existing model compared to the CDC model. Water surface elevation comparisons between proposed and revised existing model results show that proposed elevations are equal to or slightly lower than the revised existing conditions. This is due to the decrease in the number of piers for proposed conditions. The Appendix includes detailed HEC-RAS output as well as a proposed bridge schematic and the existing SH 183 bridge TxDOT as-built plans. DRAFT 4
APPENDIX
Elm Fork at SH183 100-yr WSEL Comparison Existing Revised Existing Proposed Reach River Sta Profile Q Total W.S. Elev Reach River Sta Profile Q Total W.S. Elev Δ WSEL Reach River Sta Profile Q Total W.S. Elev Δ WSEL (cfs) (ft) (cfs) (ft) (ft) (cfs) (ft) (ft) ef1 31605 100 YEAR 45600 427.29 ef1 31605 100 YEAR 45600 427.23-0.06 ef1 31605 100 YEAR 45600 427.23 0 ef1 30755 100 YEAR 42900 427.21 ef1 30755 100 YEAR 42900 427.14-0.07 ef1 30755 100 YEAR 42900 427.14 0 ef1 29539 100 YEAR 42900 427.09 ef1 29539 100 YEAR 42900 427.03-0.06 ef1 29539 100 YEAR 42900 427.02-0.01 ef1 29438 100 YEAR 42900 427.07 ef1 29438 100 YEAR 42900 427.00-0.07 ef1 29438 100 YEAR 42900 427.00 0 ef1 29378.5 Bridge ef1 29378.5 Bridge ef1 29378.5 Bridge ef1 29320 100 YEAR 42900 427.01 ef1 29320 100 YEAR 42900 426.94-0.07 ef1 29320 100 YEAR 42900 426.94 0 ef1 29319 100 YEAR 42900 427.01 ef1 29319 100 YEAR 42900 426.95-0.06 ef1 29319 100 YEAR 42900 426.94-0.01 ef1 29170 100 YEAR 42900 426.85 ef1 29170 100 YEAR 42900 426.79-0.06 ef1 29170 100 YEAR 42900 426.78-0.01 ef1 28770 100 YEAR 42900 426.52 ef1 28770 100 YEAR 42900 426.45-0.07 ef1 28770 100 YEAR 42900 426.44-0.01 ef1 28109 100 YEAR 42900 426.29 ef1 28109 100 YEAR 42900 426.21-0.08 ef1 28109 100 YEAR 42900 426.20-0.01 ef1 27249 100 YEAR 42900 426.18 ef1 27249 100 YEAR 42900 426.09-0.09 ef1 27249 100 YEAR 42900 426.09 0 ef1 26342 100 YEAR 42900 426.07 ef1 26342 100 YEAR 42900 425.99-0.08 ef1 26342 100 YEAR 42900 425.98-0.01 ef1 25248 100 YEAR 42900 426.01 ef1 25248 100 YEAR 42900 425.93-0.08 ef1 25248 100 YEAR 42900 425.92-0.01 ef1 24534 100 YEAR 42900 425.97 ef1 24534 100 YEAR 42900 425.89-0.08 ef1 24534 100 YEAR 42900 425.88-0.01 ef1 23574 100 YEAR 42900 425.87 ef1 23574 100 YEAR 42900 425.78-0.09 ef1 23574 100 YEAR 42900 425.78 0 ef1 22649 100 YEAR 42900 425.67 ef1 22649 100 YEAR 42900 425.57-0.1 ef1 22649 100 YEAR 42900 425.57 0 ef1 22546 100 YEAR 42900 425.68 ef1 22546 100 YEAR 42900 425.59-0.09 ef1 22546 100 YEAR 42900 425.59 0 ef1 22501 Bridge ef1 22501 Bridge ef1 22501 Bridge ef1 22457 100 YEAR 42900 425.66 ef1 22457 100 YEAR 42900 425.56-0.1 ef1 22457 100 YEAR 42900 425.56 0 ef1 22456 100 YEAR 42900 425.59 ef1 22456 100 YEAR 42900 425.50-0.09 ef1 22456 100 YEAR 42900 425.50 0 ef1 22356 100 YEAR 42900 425.60 ef1 22356 100 YEAR 42900 425.50-0.1 ef1 22356 100 YEAR 42900 425.50 0 ef1 21333 100 YEAR 42500 425.53 ef1 21333 100 YEAR 42500 425.44-0.09 ef1 21333 100 YEAR 42500 425.43-0.01 ef1 20480 100 YEAR 42500 425.48 ef1 20480 100 YEAR 42500 425.38-0.1 ef1 20480 100 YEAR 42500 425.38 0 ef1 19477 100 YEAR 42500 425.36 ef1 19477 100 YEAR 42500 425.26-0.1 ef1 19477 100 YEAR 42500 425.26 0 ef1 18621 100 YEAR 43100 425.29 ef1 18621 100 YEAR 43100 425.18-0.11 ef1 18621 100 YEAR 43100 425.18 0 ef1 18577 100 YEAR 43100 425.28 ef1 18577 100 YEAR 43100 425.18-0.1 ef1 18577 100 YEAR 43100 425.18 0 ef1 18576 100 YEAR 43100 425.23 ef1 18576 100 YEAR 43100 425.12-0.11 ef1 18576 100 YEAR 43100 425.12 0 ef1 18571 100 YEAR 43100 425.23 ef1 18571 100 YEAR 43100 425.12-0.11 ef1 18571 100 YEAR 43100 425.12 0 ef1 18570 100 YEAR 43100 425.26 ef1 18570 100 YEAR 43100 425.16-0.1 ef1 18570 100 YEAR 43100 425.16 0 ef1 18521 100 YEAR 43100 425.26 ef1 18521 100 YEAR 43100 425.16-0.1 ef1 18521 100 YEAR 43100 425.16 0 ef1 17615 100 YEAR 43100 425.23 ef1 17615 100 YEAR 43100 425.13-0.1 ef1 17615 100 YEAR 43100 425.13 0 ef1 16649 100 YEAR 43100 425.14 ef1 16649 100 YEAR 43100 425.04-0.1 ef1 16649 100 YEAR 43100 425.04 0 ef1 15678 100 YEAR 43100 425.05 ef1 15678 100 YEAR 43100 425.01-0.04 ef1 15678 100 YEAR 43100 425.01 0 ef1 14808 100 YEAR 43100 424.95 ef1 14808 100 YEAR 43100 424.95 0 ef1 14712 100 YEAR 43100 424.94 ef1 14712 100 YEAR 43100 424.94 0 ef1 14648 100 YEAR 43100 424.95 ef1 14648 100 YEAR 43100 424.94-0.01 ef1 14545 100 YEAR 43100 424.94 ef1 14545 100 YEAR 43100 424.93-0.01 ef1 14544 100 YEAR 43100 424.94 ef1 14544 100 YEAR 43100 424.93-0.01 ef1 14478 Bridge ef1 14478 Bridge ef1 14478 Bridge ef1 14411 100 YEAR 43100 424.90 ef1 14411 100 YEAR 43100 424.91 0.01 ef1 14317 100 YEAR 43100 424.89 ef1 14317 100 YEAR 43100 424.90 0.01 ef1 14253 100 YEAR 43100 424.91 ef1 14253 100 YEAR 43100 424.91 0 ef1 14062 100 YEAR 43100 424.89 ef1 14062 100 YEAR 43100 424.90 0.01 ef1 14062 100 YEAR 43100 424.90 0 ef1 13962 100 YEAR 43100 424.88 ef1 13962 100 YEAR 43100 424.90 0.02 ef1 13962 100 YEAR 43100 424.90 0 ef1 13961 100 YEAR 43100 424.89 ef1 13961 100 YEAR 43100 424.89 0 ef1 13961 100 YEAR 43100 424.89 0 ef1 13941 100 YEAR 43100 424.89 ef1 13941 100 YEAR 43100 424.89 0 ef1 13941 100 YEAR 43100 424.89 0 ef1 13940 100 YEAR 43100 424.87 ef1 13940 100 YEAR 43100 424.87 0 ef1 13940 100 YEAR 43100 424.87 0 ef1 13842 100 YEAR 43100 424.87 ef1 13842 100 YEAR 43100 424.87 0 ef1 13842 100 YEAR 43100 424.87 0 ef1 13293 100 YEAR 43100 424.81 ef1 13293 100 YEAR 43100 424.81 0 ef1 13293 100 YEAR 43100 424.81 0 ef1 12658 100 YEAR 42700 424.77 ef1 12658 100 YEAR 42700 424.77 0 ef1 12658 100 YEAR 42700 424.77 0 I:\19000s\19474\HH\xls\WSEL Comparison.xls Page 1 of 2 7/20/2007
Elm Fork at SH183 100-yr WSEL Comparison Existing Revised Existing Proposed Reach River Sta Profile Q Total W.S. Elev Reach River Sta Profile Q Total W.S. Elev Δ WSEL Reach River Sta Profile Q Total W.S. Elev Δ WSEL (cfs) (ft) (cfs) (ft) (ft) (cfs) (ft) (ft) ef1 11576 100 YEAR 42700 424.71 ef1 11576 100 YEAR 42700 424.71 0 ef1 11576 100 YEAR 42700 424.71 0 ef1 10532 100 YEAR 42700 424.59 ef1 10532 100 YEAR 42700 424.59 0 ef1 10532 100 YEAR 42700 424.59 0 ef1 9594 100 YEAR 42700 424.50 ef1 9594 100 YEAR 42700 424.50 0 ef1 9594 100 YEAR 42700 424.50 0 ef1 8599 100 YEAR 42700 424.32 ef1 8599 100 YEAR 42700 424.32 0 ef1 8599 100 YEAR 42700 424.32 0 ef1 7829 100 YEAR 42700 424.23 ef1 7829 100 YEAR 42700 424.23 0 ef1 7829 100 YEAR 42700 424.23 0 ef1 7355 100 YEAR 42700 424.18 ef1 7355 100 YEAR 42700 424.18 0 ef1 7355 100 YEAR 42700 424.18 0 ef1 6783 100 YEAR 42700 424.06 ef1 6783 100 YEAR 42700 424.06 0 ef1 6783 100 YEAR 42700 424.06 0 ef1 6689 100 YEAR 28800 424.13 ef1 6689 100 YEAR 28800 424.13 0 ef1 6689 100 YEAR 28800 424.13 0 ef1 6678 Bridge ef1 6678 Bridge ef1 6678 Bridge ef1 6668 100 YEAR 28800 424.12 ef1 6668 100 YEAR 28800 424.12 0 ef1 6668 100 YEAR 28800 424.12 0 ef1 6667 100 YEAR 28800 424.12 ef1 6667 100 YEAR 28800 424.12 0 ef1 6667 100 YEAR 28800 424.12 0 ef1 6563 100 YEAR 28800 424.11 ef1 6563 100 YEAR 28800 424.11 0 ef1 6563 100 YEAR 28800 424.11 0 ef1 5965 100 YEAR 28800 424.10 ef1 5965 100 YEAR 28800 424.10 0 ef1 5965 100 YEAR 28800 424.10 0 ef1 5438 100 YEAR 28800 424.09 ef1 5438 100 YEAR 28800 424.09 0 ef1 5438 100 YEAR 28800 424.09 0 ef1 4925 100 YEAR 28800 424.07 ef1 4925 100 YEAR 28800 424.07 0 ef1 4925 100 YEAR 28800 424.07 0 ef1 4826 100 YEAR 28800 424.06 ef1 4826 100 YEAR 28800 424.06 0 ef1 4826 100 YEAR 28800 424.06 0 ef1 4792.5 Bridge ef1 4792.5 Bridge ef1 4792.5 Bridge ef1 4760 100 YEAR 28800 424.05 ef1 4760 100 YEAR 28800 424.05 0 ef1 4760 100 YEAR 28800 424.05 0 ef1 4759 100 YEAR 28800 424.06 ef1 4759 100 YEAR 28800 424.06 0 ef1 4759 100 YEAR 28800 424.06 0 ef1 4653 100 YEAR 28800 424.05 ef1 4653 100 YEAR 28800 424.05 0 ef1 4653 100 YEAR 28800 424.05 0 ef1 4076 100 YEAR 28800 424.05 ef1 4076 100 YEAR 28800 424.05 0 ef1 4076 100 YEAR 28800 424.05 0 ef1 3295 100 YEAR 28800 424.01 ef1 3295 100 YEAR 28800 424.01 0 ef1 3295 100 YEAR 28800 424.01 0 ef1 3190 100 YEAR 28800 424.00 ef1 3190 100 YEAR 28800 424.00 0 ef1 3190 100 YEAR 28800 424.00 0 ef1 3154 Bridge ef1 3154 Bridge ef1 3154 Bridge ef1 3119 100 YEAR 28800 423.99 ef1 3119 100 YEAR 28800 423.99 0 ef1 3119 100 YEAR 28800 423.99 0 ef1 3118 100 YEAR 28800 423.99 ef1 3118 100 YEAR 28800 423.99 0 ef1 3118 100 YEAR 28800 423.99 0 ef1 3013 100 YEAR 28800 423.98 ef1 3013 100 YEAR 28800 423.98 0 ef1 3013 100 YEAR 28800 423.98 0 Note: The revised existing model includes XS data from the existing model plus added XS 14808, XS 14712 and XS 14253 The width of SH183 bridge was changed from 132 to 131 because RAS won't run if reach length is equal to dist to US XS+deck width I:\19000s\19474\HH\xls\WSEL Comparison.xls Page 2 of 2 7/20/2007
Elm Fork at SH183 500-yr WSEL Comparison Existing Revised Existing Proposed Reach River Sta Profile Q Total W.S. Elev Reach River Sta Profile Q Total W.S. Elev Δ WSEL Reach River Sta Profile Q Total W.S. Elev Δ WSEL (cfs) (ft) (cfs) (ft) (ft) (cfs) (ft) (ft) ef1 31605 500 YEAR 51800 432.63 ef1 31605 500 YEAR 51800 432.58-0.05 ef1 31605 500 YEAR 51800 432.58 0 ef1 30755 500 YEAR 51800 432.60 ef1 30755 500 YEAR 51800 432.55-0.05 ef1 30755 500 YEAR 51800 432.55 0 ef1 29539 500 YEAR 51800 432.54 ef1 29539 500 YEAR 51800 432.49-0.05 ef1 29539 500 YEAR 51800 432.49 0 ef1 29438 500 YEAR 51800 432.52 ef1 29438 500 YEAR 51800 432.47-0.05 ef1 29438 500 YEAR 51800 432.47 0 ef1 29378.5 Bridge ef1 29378.5 Bridge ef1 29378.5 Bridge ef1 29320 500 YEAR 51800 432.48 ef1 29320 500 YEAR 51800 432.43-0.05 ef1 29320 500 YEAR 51800 432.42-0.01 ef1 29319 500 YEAR 51800 432.47 ef1 29319 500 YEAR 51800 432.42-0.05 ef1 29319 500 YEAR 51800 432.42 0 ef1 29170 500 YEAR 51800 432.45 ef1 29170 500 YEAR 51800 432.40-0.05 ef1 29170 500 YEAR 51800 432.40 0 ef1 28770 500 YEAR 51800 432.41 ef1 28770 500 YEAR 51800 432.35-0.06 ef1 28770 500 YEAR 51800 432.35 0 ef1 28109 500 YEAR 51800 432.35 ef1 28109 500 YEAR 51800 432.29-0.06 ef1 28109 500 YEAR 51800 432.29 0 ef1 27249 500 YEAR 51800 432.31 ef1 27249 500 YEAR 51800 432.26-0.05 ef1 27249 500 YEAR 51800 432.25-0.01 ef1 26342 500 YEAR 51800 432.28 ef1 26342 500 YEAR 51800 432.22-0.06 ef1 26342 500 YEAR 51800 432.22 0 ef1 25248 500 YEAR 51800 432.26 ef1 25248 500 YEAR 51800 432.20-0.06 ef1 25248 500 YEAR 51800 432.20 0 ef1 24534 500 YEAR 51800 432.25 ef1 24534 500 YEAR 51800 432.19-0.06 ef1 24534 500 YEAR 51800 432.19 0 ef1 23574 500 YEAR 51800 432.20 ef1 23574 500 YEAR 51800 432.15-0.05 ef1 23574 500 YEAR 51800 432.14-0.01 ef1 22649 500 YEAR 51800 432.14 ef1 22649 500 YEAR 51800 432.08-0.06 ef1 22649 500 YEAR 51800 432.08 0 ef1 22546 500 YEAR 51800 432.14 ef1 22546 500 YEAR 51800 432.08-0.06 ef1 22546 500 YEAR 51800 432.08 0 ef1 22501 Bridge ef1 22501 Bridge ef1 22501 Bridge ef1 22457 500 YEAR 51800 432.12 ef1 22457 500 YEAR 51800 432.06-0.06 ef1 22457 500 YEAR 51800 432.06 0 ef1 22456 500 YEAR 51800 432.08 ef1 22456 500 YEAR 51800 432.02-0.06 ef1 22456 500 YEAR 51800 432.02 0 ef1 22356 500 YEAR 51800 432.09 ef1 22356 500 YEAR 51800 432.03-0.06 ef1 22356 500 YEAR 51800 432.03 0 ef1 21333 500 YEAR 51800 432.07 ef1 21333 500 YEAR 51800 432.02-0.05 ef1 21333 500 YEAR 51800 432.02 0 ef1 20480 500 YEAR 51800 432.05 ef1 20480 500 YEAR 51800 432.00-0.05 ef1 20480 500 YEAR 51800 431.99-0.01 ef1 19477 500 YEAR 51800 431.99 ef1 19477 500 YEAR 51800 431.93-0.06 ef1 19477 500 YEAR 51800 431.93 0 ef1 18621 500 YEAR 51800 431.95 ef1 18621 500 YEAR 51800 431.89-0.06 ef1 18621 500 YEAR 51800 431.89 0 ef1 18577 500 YEAR 51800 431.95 ef1 18577 500 YEAR 51800 431.89-0.06 ef1 18577 500 YEAR 51800 431.89 0 ef1 18576 500 YEAR 51800 431.91 ef1 18576 500 YEAR 51800 431.85-0.06 ef1 18576 500 YEAR 51800 431.84-0.01 ef1 18571 500 YEAR 51800 431.91 ef1 18571 500 YEAR 51800 431.85-0.06 ef1 18571 500 YEAR 51800 431.84-0.01 ef1 18570 500 YEAR 51800 431.93 ef1 18570 500 YEAR 51800 431.88-0.05 ef1 18570 500 YEAR 51800 431.87-0.01 ef1 18521 500 YEAR 51800 431.93 ef1 18521 500 YEAR 51800 431.87-0.06 ef1 18521 500 YEAR 51800 431.87 0 ef1 17615 500 YEAR 51800 431.92 ef1 17615 500 YEAR 51800 431.86-0.06 ef1 17615 500 YEAR 51800 431.86 0 ef1 16649 500 YEAR 51800 431.86 ef1 16649 500 YEAR 51800 431.80-0.06 ef1 16649 500 YEAR 51800 431.80 0 ef1 15678 500 YEAR 51800 431.81 ef1 15678 500 YEAR 51800 431.79-0.02 ef1 15678 500 YEAR 51800 431.79 0 ef1 14808 500 YEAR 51800 431.76 ef1 14808 500 YEAR 51800 431.76 0 ef1 14712 500 YEAR 51800 431.76 ef1 14712 500 YEAR 51800 431.76 0 ef1 14648 500 YEAR 51800 431.76 ef1 14648 500 YEAR 51800 431.75-0.01 ef1 14545 500 YEAR 51800 431.76 ef1 14545 500 YEAR 51800 431.75-0.01 ef1 14544 500 YEAR 51800 431.76 ef1 14544 500 YEAR 51800 431.75-0.01 ef1 14478 Bridge ef1 14478 Bridge ef1 14478 Bridge ef1 14411 500 YEAR 51800 431.74 ef1 14411 500 YEAR 51800 431.74 0 ef1 14317 500 YEAR 51800 431.73 ef1 14317 500 YEAR 51800 431.73 0 ef1 14253 500 YEAR 51800 431.74 ef1 14253 500 YEAR 51800 431.74 0 ef1 14062 500 YEAR 51800 431.73 ef1 14062 500 YEAR 51800 431.73 0 ef1 14062 500 YEAR 51800 431.73 0 ef1 13962 500 YEAR 51800 431.72 ef1 13962 500 YEAR 51800 431.73 0.01 ef1 13962 500 YEAR 51800 431.73 0 ef1 13961 500 YEAR 51800 431.73 ef1 13961 500 YEAR 51800 431.73 0 ef1 13961 500 YEAR 51800 431.73 0 ef1 13941 500 YEAR 51800 431.73 ef1 13941 500 YEAR 51800 431.73 0 ef1 13941 500 YEAR 51800 431.73 0 ef1 13940 500 YEAR 51800 431.72 ef1 13940 500 YEAR 51800 431.72 0 ef1 13940 500 YEAR 51800 431.72 0 ef1 13842 500 YEAR 51800 431.71 ef1 13842 500 YEAR 51800 431.71 0 ef1 13842 500 YEAR 51800 431.71 0 ef1 13293 500 YEAR 51800 431.68 ef1 13293 500 YEAR 51800 431.68 0 ef1 13293 500 YEAR 51800 431.68 0 ef1 12658 500 YEAR 51800 431.66 ef1 12658 500 YEAR 51800 431.66 0 ef1 12658 500 YEAR 51800 431.66 0 I:\19000s\19474\HH\xls\WSEL Comparison.xls Page 1 of 2 7/20/2007
Elm Fork at SH183 500-yr WSEL Comparison Existing Revised Existing Proposed Reach River Sta Profile Q Total W.S. Elev Reach River Sta Profile Q Total W.S. Elev Δ WSEL Reach River Sta Profile Q Total W.S. Elev Δ WSEL (cfs) (ft) (cfs) (ft) (ft) (cfs) (ft) (ft) ef1 11576 500 YEAR 51800 431.63 ef1 11576 500 YEAR 51800 431.63 0 ef1 11576 500 YEAR 51800 431.63 0 ef1 10532 500 YEAR 51800 431.57 ef1 10532 500 YEAR 51800 431.57 0 ef1 10532 500 YEAR 51800 431.57 0 ef1 9594 500 YEAR 51800 431.52 ef1 9594 500 YEAR 51800 431.52 0 ef1 9594 500 YEAR 51800 431.52 0 ef1 8599 500 YEAR 51800 431.45 ef1 8599 500 YEAR 51800 431.45 0 ef1 8599 500 YEAR 51800 431.45 0 ef1 7829 500 YEAR 51800 431.42 ef1 7829 500 YEAR 51800 431.42 0 ef1 7829 500 YEAR 51800 431.42 0 ef1 7355 500 YEAR 51800 431.40 ef1 7355 500 YEAR 51800 431.40 0 ef1 7355 500 YEAR 51800 431.40 0 ef1 6783 500 YEAR 51800 431.34 ef1 6783 500 YEAR 51800 431.34 0 ef1 6783 500 YEAR 51800 431.34 0 ef1 6689 500 YEAR 51800 431.33 ef1 6689 500 YEAR 51800 431.33 0 ef1 6689 500 YEAR 51800 431.33 0 ef1 6678 Bridge ef1 6678 Bridge ef1 6678 Bridge ef1 6668 500 YEAR 51800 431.33 ef1 6668 500 YEAR 51800 431.33 0 ef1 6668 500 YEAR 51800 431.33 0 ef1 6667 500 YEAR 51800 431.33 ef1 6667 500 YEAR 51800 431.33 0 ef1 6667 500 YEAR 51800 431.33 0 ef1 6563 500 YEAR 51800 431.32 ef1 6563 500 YEAR 51800 431.32 0 ef1 6563 500 YEAR 51800 431.32 0 ef1 5965 500 YEAR 51800 431.31 ef1 5965 500 YEAR 51800 431.31 0 ef1 5965 500 YEAR 51800 431.31 0 ef1 5438 500 YEAR 51800 431.29 ef1 5438 500 YEAR 51800 431.29 0 ef1 5438 500 YEAR 51800 431.29 0 ef1 4925 500 YEAR 51800 431.27 ef1 4925 500 YEAR 51800 431.27 0 ef1 4925 500 YEAR 51800 431.27 0 ef1 4826 500 YEAR 51800 431.26 ef1 4826 500 YEAR 51800 431.26 0 ef1 4826 500 YEAR 51800 431.26 0 ef1 4792.5 Bridge ef1 4792.5 Bridge ef1 4792.5 Bridge ef1 4760 500 YEAR 51800 431.25 ef1 4760 500 YEAR 51800 431.25 0 ef1 4760 500 YEAR 51800 431.25 0 ef1 4759 500 YEAR 51800 431.25 ef1 4759 500 YEAR 51800 431.25 0 ef1 4759 500 YEAR 51800 431.25 0 ef1 4653 500 YEAR 51800 431.25 ef1 4653 500 YEAR 51800 431.25 0 ef1 4653 500 YEAR 51800 431.25 0 ef1 4076 500 YEAR 51800 431.24 ef1 4076 500 YEAR 51800 431.24 0 ef1 4076 500 YEAR 51800 431.24 0 ef1 3295 500 YEAR 51800 431.20 ef1 3295 500 YEAR 51800 431.20 0 ef1 3295 500 YEAR 51800 431.20 0 ef1 3190 500 YEAR 51800 431.19 ef1 3190 500 YEAR 51800 431.19 0 ef1 3190 500 YEAR 51800 431.19 0 ef1 3154 Bridge ef1 3154 Bridge ef1 3154 Bridge ef1 3119 500 YEAR 51800 431.18 ef1 3119 500 YEAR 51800 431.18 0 ef1 3119 500 YEAR 51800 431.18 0 ef1 3118 500 YEAR 51800 431.18 ef1 3118 500 YEAR 51800 431.18 0 ef1 3118 500 YEAR 51800 431.18 0 ef1 3013 500 YEAR 51800 431.16 ef1 3013 500 YEAR 51800 431.16 0 ef1 3013 500 YEAR 51800 431.16 0 Note: The revised existing model includes XS data from the existing model plus added XS 14808, XS 14712 and XS 14253 The width of SH183 bridge was changed from 132 to 131 because RAS won't run if reach length is equal to dist to US XS+deck width I:\19000s\19474\HH\xls\WSEL Comparison.xls Page 2 of 2 7/20/2007
Elm Fork at SH183 SPF WSEL Comparison Existing Revised Existing Proposed Reach River Sta Profile Q Total W.S. Elev Reach River Sta Profile Q Total W.S. Elev Δ WSEL Reach River Sta Profile Q Total W.S. Elev Δ WSEL (cfs) (ft) (cfs) (ft) (ft) (cfs) (ft) (ft) ef1 31605 SPF 102500 438.99 ef1 31605 SPF 102500 438.87-0.12 ef1 31605 SPF 102500 438.86-0.01 ef1 30755 SPF 102500 438.95 ef1 30755 SPF 102500 438.84-0.11 ef1 30755 SPF 102500 438.83-0.01 ef1 29539 SPF 102500 438.87 ef1 29539 SPF 102500 438.76-0.11 ef1 29539 SPF 102500 438.75-0.01 ef1 29438 SPF 102500 438.84 ef1 29438 SPF 102500 438.72-0.12 ef1 29438 SPF 102500 438.72 0 ef1 29378.5 Bridge ef1 29378.5 Bridge ef1 29378.5 Bridge ef1 29320 SPF 102500 438.72 ef1 29320 SPF 102500 438.60-0.12 ef1 29320 SPF 102500 438.60 0 ef1 29319 SPF 102500 438.69 ef1 29319 SPF 102500 438.57-0.12 ef1 29319 SPF 102500 438.57 0 ef1 29170 SPF 102500 438.69 ef1 29170 SPF 102500 438.57-0.12 ef1 29170 SPF 102500 438.56-0.01 ef1 28770 SPF 102500 438.64 ef1 28770 SPF 102500 438.52-0.12 ef1 28770 SPF 102500 438.52 0 ef1 28109 SPF 102500 438.58 ef1 28109 SPF 102500 438.46-0.12 ef1 28109 SPF 102500 438.45-0.01 ef1 27249 SPF 102500 438.54 ef1 27249 SPF 102500 438.41-0.13 ef1 27249 SPF 102500 438.41 0 ef1 26342 SPF 102500 438.50 ef1 26342 SPF 102500 438.38-0.12 ef1 26342 SPF 102500 438.37-0.01 ef1 25248 SPF 102500 438.47 ef1 25248 SPF 102500 438.35-0.12 ef1 25248 SPF 102500 438.34-0.01 ef1 24534 SPF 102500 438.46 ef1 24534 SPF 102500 438.33-0.13 ef1 24534 SPF 102500 438.33 0 ef1 23574 SPF 103200 438.39 ef1 23574 SPF 103200 438.27-0.12 ef1 23574 SPF 103200 438.26-0.01 ef1 22649 SPF 103200 438.28 ef1 22649 SPF 103200 438.15-0.13 ef1 22649 SPF 103200 438.15 0 ef1 22546 SPF 103200 438.28 ef1 22546 SPF 103200 438.15-0.13 ef1 22546 SPF 103200 438.15 0 ef1 22501 Bridge ef1 22501 Bridge ef1 22501 Bridge ef1 22457 SPF 103200 438.18 ef1 22457 SPF 103200 438.05-0.13 ef1 22457 SPF 103200 438.05 0 ef1 22456 SPF 103200 438.07 ef1 22456 SPF 103200 437.93-0.14 ef1 22456 SPF 103200 437.93 0 ef1 22356 SPF 103200 438.13 ef1 22356 SPF 103200 437.99-0.14 ef1 22356 SPF 103200 437.99 0 ef1 21333 SPF 103200 438.10 ef1 21333 SPF 103200 437.97-0.13 ef1 21333 SPF 103200 437.97 0 ef1 20480 SPF 103200 438.07 ef1 20480 SPF 103200 437.94-0.13 ef1 20480 SPF 103200 437.94 0 ef1 19477 SPF 103200 437.94 ef1 19477 SPF 103200 437.81-0.13 ef1 19477 SPF 103200 437.80-0.01 ef1 18621 SPF 106200 437.86 ef1 18621 SPF 106200 437.72-0.14 ef1 18621 SPF 106200 437.72 0 ef1 18577 SPF 106200 437.86 ef1 18577 SPF 106200 437.72-0.14 ef1 18577 SPF 106200 437.72 0 ef1 18576 SPF 106200 437.73 ef1 18576 SPF 106200 437.60-0.13 ef1 18576 SPF 106200 437.59-0.01 ef1 18571 SPF 106200 437.73 ef1 18571 SPF 106200 437.60-0.13 ef1 18571 SPF 106200 437.59-0.01 ef1 18570 SPF 106200 437.81 ef1 18570 SPF 106200 437.68-0.13 ef1 18570 SPF 106200 437.67-0.01 ef1 18521 SPF 106200 437.81 ef1 18521 SPF 106200 437.67-0.14 ef1 18521 SPF 106200 437.67 0 ef1 17615 SPF 106200 437.79 ef1 17615 SPF 106200 437.66-0.13 ef1 17615 SPF 106200 437.65-0.01 ef1 16649 SPF 106200 437.65 ef1 16649 SPF 106200 437.52-0.13 ef1 16649 SPF 106200 437.51-0.01 ef1 15678 SPF 106200 437.55 ef1 15678 SPF 106200 437.49-0.06 ef1 15678 SPF 106200 437.48-0.01 ef1 14808 SPF 106200 437.42 ef1 14808 SPF 106200 437.42 0 ef1 14712 SPF 106200 437.41 ef1 14712 SPF 106200 437.41 0 ef1 14648 SPF 106200 437.44 ef1 14648 SPF 106200 437.41-0.03 ef1 14545 SPF 106200 437.43 ef1 14545 SPF 106200 437.40-0.03 ef1 14544 SPF 106200 437.43 ef1 14544 SPF 106200 437.40-0.03 ef1 14478 Bridge ef1 14478 Bridge ef1 14478 Bridge ef1 14411 SPF 106200 437.37 ef1 14411 SPF 106200 437.36-0.01 ef1 14317 SPF 106200 437.36 ef1 14317 SPF 106200 437.36 0 ef1 14253 SPF 106200 437.36 ef1 14253 SPF 106200 437.36 0 ef1 14062 SPF 106200 437.35 ef1 14062 SPF 106200 437.36 0.01 ef1 14062 SPF 106200 437.36 0 ef1 13962 SPF 106200 437.34 ef1 13962 SPF 106200 437.35 0.01 ef1 13962 SPF 106200 437.35 0 ef1 13961 SPF 106200 437.36 ef1 13961 SPF 106200 437.36 0 ef1 13961 SPF 106200 437.36 0 ef1 13941 SPF 106200 437.36 ef1 13941 SPF 106200 437.36 0 ef1 13941 SPF 106200 437.36 0 ef1 13940 SPF 106200 437.32 ef1 13940 SPF 106200 437.32 0 ef1 13940 SPF 106200 437.32 0 ef1 13842 SPF 106200 437.31 ef1 13842 SPF 106200 437.31 0 ef1 13842 SPF 106200 437.31 0 ef1 13293 SPF 106200 437.25 ef1 13293 SPF 106200 437.25 0 ef1 13293 SPF 106200 437.25 0 ef1 12658 SPF 106200 437.21 ef1 12658 SPF 106200 437.21 0 ef1 12658 SPF 106200 437.21 0 I:\19000s\19474\HH\xls\WSEL Comparison.xls Page 1 of 2 7/20/2007
Elm Fork at SH183 SPF WSEL Comparison Existing Revised Existing Proposed Reach River Sta Profile Q Total W.S. Elev Reach River Sta Profile Q Total W.S. Elev Δ WSEL Reach River Sta Profile Q Total W.S. Elev Δ WSEL (cfs) (ft) (cfs) (ft) (ft) (cfs) (ft) (ft) ef1 11576 SPF 106200 437.12 ef1 11576 SPF 106200 437.12 0 ef1 11576 SPF 106200 437.12 0 ef1 10532 SPF 106200 437.00 ef1 10532 SPF 106200 437.00 0 ef1 10532 SPF 106200 437.00 0 ef1 9594 SPF 106200 436.90 ef1 9594 SPF 106200 436.90 0 ef1 9594 SPF 106200 436.90 0 ef1 8599 SPF 106200 436.75 ef1 8599 SPF 106200 436.75 0 ef1 8599 SPF 106200 436.75 0 ef1 7829 SPF 106200 436.71 ef1 7829 SPF 106200 436.71 0 ef1 7829 SPF 106200 436.71 0 ef1 7355 SPF 106200 436.66 ef1 7355 SPF 106200 436.66 0 ef1 7355 SPF 106200 436.66 0 ef1 6783 SPF 106200 436.52 ef1 6783 SPF 106200 436.52 0 ef1 6783 SPF 106200 436.52 0 ef1 6689 SPF 106200 436.50 ef1 6689 SPF 106200 436.50 0 ef1 6689 SPF 106200 436.50 0 ef1 6678 Bridge ef1 6678 Bridge ef1 6678 Bridge ef1 6668 SPF 106200 436.49 ef1 6668 SPF 106200 436.49 0 ef1 6668 SPF 106200 436.49 0 ef1 6667 SPF 106200 436.49 ef1 6667 SPF 106200 436.49 0 ef1 6667 SPF 106200 436.49 0 ef1 6563 SPF 106200 436.48 ef1 6563 SPF 106200 436.48 0 ef1 6563 SPF 106200 436.48 0 ef1 5965 SPF 106200 436.44 ef1 5965 SPF 106200 436.44 0 ef1 5965 SPF 106200 436.44 0 ef1 5438 SPF 106200 436.41 ef1 5438 SPF 106200 436.41 0 ef1 5438 SPF 106200 436.41 0 ef1 4925 SPF 106200 436.36 ef1 4925 SPF 106200 436.36 0 ef1 4925 SPF 106200 436.36 0 ef1 4826 SPF 106200 436.34 ef1 4826 SPF 106200 436.34 0 ef1 4826 SPF 106200 436.34 0 ef1 4792.5 Bridge ef1 4792.5 Bridge ef1 4792.5 Bridge ef1 4760 SPF 106200 436.26 ef1 4760 SPF 106200 436.26 0 ef1 4760 SPF 106200 436.26 0 ef1 4759 SPF 106200 436.28 ef1 4759 SPF 106200 436.28 0 ef1 4759 SPF 106200 436.28 0 ef1 4653 SPF 106200 436.27 ef1 4653 SPF 106200 436.27 0 ef1 4653 SPF 106200 436.27 0 ef1 4076 SPF 106200 436.26 ef1 4076 SPF 106200 436.26 0 ef1 4076 SPF 106200 436.26 0 ef1 3295 SPF 106200 436.17 ef1 3295 SPF 106200 436.17 0 ef1 3295 SPF 106200 436.17 0 ef1 3190 SPF 106200 436.15 ef1 3190 SPF 106200 436.15 0 ef1 3190 SPF 106200 436.15 0 ef1 3154 Bridge ef1 3154 Bridge ef1 3154 Bridge ef1 3119 SPF 106200 436.12 ef1 3119 SPF 106200 436.12 0 ef1 3119 SPF 106200 436.12 0 ef1 3118 SPF 106200 436.12 ef1 3118 SPF 106200 436.12 0 ef1 3118 SPF 106200 436.12 0 ef1 3013 SPF 106200 436.07 ef1 3013 SPF 106200 436.07 0 ef1 3013 SPF 106200 436.07 0 Note: The revised existing model includes XS data from the existing model plus added XS 14808, XS 14712 and XS 14253 The width of SH183 bridge was changed from 132 to 131 because RAS won't run if reach length is equal to dist to US XS+deck width I:\19000s\19474\HH\xls\WSEL Comparison.xls Page 2 of 2 7/20/2007