Hydrology & Hydraulics Report

Bartett Bridge #2041 over Kennebunk River

Kennebunk and Arundel, Maine

STP-2046(800) WIN 20468.00

Maine Department of Transportation Bridge Program

Hydrology Report | 1 HYDROLOGY REPORT

Bartlett Bridge (#2041) over the Kennebunk River carries US Route 1 between Kennebunk and Arundel, Maine. The Kennebunk River watershed extends north and west from the bridge location. The basin begins at Kennebunk Pond in Lyman to the north and Carlisle Brook in Lyman to the west. Kennebunk Pond outlets to Lords Brook and the Kennebunk River is formed at the confluence of Carlisle and Lord Brooks in Lyman, 10.9 miles upstream of Bartlett Bridge. The watershed upstream of the bridge is 16% wetlands. Downstream of the bridge, the Kennebunk River continues 6.5 miles before discharging into the Atlantic Ocean between the towns of Kennebunk and Kennebunkport.

The drainage basin characteristics for this bridge were provided by the Maine Department of Transportation Environmental Office, Hydrology Section. Peak flows were calculated with techniques described in the United States Geological Survey Water-Resources Investigations Report 99-4008 (Hodgkins, 1999). Despite the close proximity to the coast line, the bridge location does not have tidal influences due to the steep grade of the Kennebunk River downstream of the bridge.

The flood of record at Bartlett Bridge occurred in April of 2007 (commonly referred to as the Patriot’s Day Flood). This event combined up to 8.5 inches of rain with snowmelt to produced peak flows greater than the 100 year recurrence interval throughout York County. The USGS report, “Flood of April 2007 in Southern Maine,” calculated the flow rate at the Bartlett Bridge crossing as 5730 CFS. For comparison, the same report provided a peak flow for the 500 year recurrence interval of 3980 CFS (see also the hydrology below provided by the Environmental Office). Unfortunately, the USGS gage on the Kennebunk River upstream from Bartlett Bridge (26.7 sq. mile drainage area) was installed the year after this event. Further discussion of the flow rate during the April 2007 event can be found in the Hydraulic Report.

SUMMARY Drainage Area 42.9 mi 2 Q1.1 416 ft 3/s Q10 1,384 ft 3/s Q25 1,717 ft 3/s Q50 1,972 ft 3/s Q100 2,244 ft 3/s Q500 2,894 ft 3/s

Reported by: Gustafson, Garrett A Date: June 15, 2016

Hydrology Report | 2 HYDRAULIC REPORT

Hydraulic Modeling

The existing and proposed bridges were analyzed in HEC-RAS 4.1.0 (Hydrologic Engineering Center’s River Analysis System), a one-dimensional hydraulics software program developed by the United States Army Corps of Engineers. A 450 foot long portion of the Kennebunk River intersecting the Bartlett Bridge crossing was modeled utilizing three cross sections upstream of the bridge and up to 6 cross sections downstream of the bridge.

This location, particularly the region immediately downstream of the bridge location, presented modeling challenges due to the complexity of the exposed bedrock and remains of a mill foundation. During low flow conditions, flow is restricted to the left side of the channel and during high discharge events, flow passes over these obstacles. At moderate flows, modeling is further complicated by secondary side channels that pass around and through the obstacles that channelize low flow conditions. To model these conditions, two models were utilized in order to provide cross sections perpendicular to flow at all of the appropriate flood levels. The high flow conditions were modeled using 5 downstream cross sections while the more complex low to intermediate flow conditions were modeled with 6 downstream cross sections.

The HEC-RAS models were based on the following assumptions:

• Steady flow • Manning’s Roughness Coefficients o Upstream Channel: n = 0.048 o Downstream Channel: n = 0.056 o All overbank areas: n = 0.090 • Default expansion (0.3) and contraction (0.1) values. • Ineffective flow areas o Existing Bridge: Utilized on 3 of 4 corners of the bridge. The upstream, left streambank (Arundel) generally falls in line with the existing Abutment No. 2 breastwall and therefore does not experience significant flow parallel to the cross section. o Proposed Bridge: Utilized on all 4 corners. o Downstream: Utilized in several secondary channels in order to model conveyance from section to section at low flow rates. • Flow Regime: Subcritical • Bridge Modeling Approach: Default settings

Hydraulic Report | 3 The reach boundary conditions were calibrated based on the USGS report “Flood of April 2007 in Southern Maine.” This report included observed water surface elevations during the April 2007 event upstream and downstream of Bartlett Bridge and a flow rate “computed with indirect methods.” The USGS also provided a file titled “Kennebunk River at Rte 1 near Kennebunk, ME – Indirect Summary” which included documentation indicating location of those water surface elevation observations relative to the existing bridge.

Hydraulic models are typically calibrated by varying the reach boundary conditions to match a documented or assumed water surface elevation or other observed condition at a known discharge rate. This procedure was pursued, however, calibration of the model for both observed water surface elevations proved to be unattainable; the model showed a variance over two feet at one observation point at the flow rate provided. Fortunately, with two observed water surface elevations, the model could be calibrated for two unknowns, discharge rate and reach boundary condition. Normal depth downstream streambed slope was selected as the reach boundary condition. The calibration procedure followed a trial and error process in which discharge rate was modified to adjust water surface elevations up and down at both observation locations and downstream streambed slope was utilized to address error variance between observation points. Model water surface elevations converged with the observed water surface elevations at a discharge rate of 4,100 cubic feet per second and a downstream streambed slope of 0.00012 ft/ft. This flow rate exceeds the 500 year recurrence interval peak flow rate which is fairly consistent with the magnitude of the April 2007 event. Since a field measured discharge rate corresponding to the April 2007 event was not available, the flow rate obtained through model calibration is considered reasonable.

An independent model developed by the USGS for the Bartlett Bridge location included a downstream streambed slope of 0.0054 ft/ft. Due to the large difference in streambed slopes between the two models, a sensitivity analysis was conducted to evaluate the impact of streambed slopes from 0.00012 ft/ft to 0.0054 ft/ft. This analysis yielded minimal fluctuation in water surface elevation and discharge velocities. In the interest of conservatism, the controlling results from streambed slopes of either 0.00012 ft/ft or 0.0054 ft/ft are reported.

Following model calibration, the site hydraulics were analyzed with both the existing and proposed bridge geometry and the discharge rates presented in the Hydrology Report. The proposed bridge geometry is summarized below:

• 78 foot single span • Low chord elevation = 47.51 o Superstructure depth = 47.25” = 36” NEXT F Beam + 8” Concrete Deck + 3.25” Bituminous Wearing Surface with High Performance Membrane. • Exposed footings and seals

Hydraulic Report | 4 Water surface elevations and discharge velocities are reported below for the existing and proposed structures:

SUMMARY Recommended Existing Structure Structure 2 Span Concrete Single Span T-Beam NEXT Beam Total Area of Waterway Opening ft 2 842 940 Headwater Elevations 1.1 Year Recurrence Interval ft 38.2 37.7 10 Year Recurrence Interval ft 40.8 39.8 25 Year Recurrence Interval ft 41.4 40.2 50 Year Recurrence Interval ft 41.9 40.6 100 Year Recurrence Interval ft 42.3 41.0 500 Year Recurrence Interval ft 43.5 42.4 Flood of Record (April 2007) ft 44.9 43.8 Vertical Clearance (Freeboard) 50 Year Recurrence Interval ft 5.0 6.9 100 Year Recurrence Interval ft 4.6 6.5 Flood of Record (April 2007) ft 2.0 3.7 Discharge Velocity 1.1 Year Recurrence Interval ft/s 6.5 6.1 10 Year Recurrence Interval ft/s 10.0 8.2 25 Year Recurrence Interval ft/s 10.5 8.9 50 Year Recurrence Interval ft/s 10.9 9.4 100 Year Recurrence Interval ft/s 11.3 10.0 500 Year Recurrence Interval ft/s 12.2 11.9 Flood of Record (April 2007) ft/s 13.5 13.4 Note: All elevations based on North American Vertical Datum (NAVD) of 1988.

The proposed structure meets all of the applicable opening requirements. The available freeboard exceeds the minimum freeboard depths specified in Bridge Design Guide Section 2.3.10.2.A, Structure Capacity (Riverine). The proposed profile was primarily controlled by maintaining the existing grade at Rollins Lane and Walker Lane while providing a 1% grade across the proposed bridge; the riverine hydraulics had little impact on the proposed profile. Additionally, the proposed bridge span length exceeds 1.2 bankfull width, 65 feet (bankfull width is 54 feet). There is no documented history of flooding problems, ice jams, or debris issues at this location and pier removal will further improve these aspects.

Hydraulic Report | 5 Scour Analysis

All of the proposed foundations are founded on bedrock and therefore the proposed structure is considered stable and insusceptible to scour.

Reported by: Gustafson, Garrett A Date: June 15, 2016

Note: Supporting documentation is provided in Appendix A of this Hydrology and Hydraulics Report.

Hydraulic Report | 6 Appendix A

Hydraulics Data

River, Saco River, Salmon Falls River (floodway data tables [FDT] only), Smith Brook, Spinney Creek, Spruce Creek, Stevens Brook, Webhannet River, and the York river (FIRM only) were revised for backwater elevations.

Roughness factors (Manning’s “n”) used in the hydraulic computations for this updated countywide study were determined from field observations guided by U.S. Geological Water Supply Publications (References 96 and 97).

Table 6, “Manning’s “n” Values,” shows the channel and overbank “n” values for the streams studied by detailed methods in both the pre-countywide and countywide studies. Values calculated for this countywide study have been noted in the table:

TABLE 6 – MANNING’S “n” VALUES

Flooding Source Channel “n” Overbanks Batson River 0.020-0.050 0.050-0.090 Blacksmith Brook 0.050 0.090 Bridges Swamp 0.050 0.090 Bunganut Pond (at outlet) 0.030-0.045 0.055-0.110 Cape Neddick River 0.013-0.050 0.090 Cider Hill Creek 0.020-0.050 0.050-0.020 Coffin Brook1 0.045-0.05 0.09-0.11 Coffin Brook Tributary 11 0.05-0.06 0.1-0.11 Cooks Brook 0.030-0.055 0.040-0.110 Day Brook 0.013-0.050 0.050-0.090 Depot Brook 0.013-0.050 0.050-0.090 Dolly Gordon Brook 0.013-0.050 0.050-0.090 Driscoll Brook1 0.04-0.05 0.045-0.1 Ferguson Brook1 0.045-0.06 0.05-0.12 Goosefare Brook 0.013-0.050 0.050-0.090 Great Works River 0.030-0.060 0.035-0.110 Green Brook 0.030-0.050 0.030-0.090 Kennebunk Pond (at west outlet) 0.030-0.045 0.055-0.110 Kennebunk River 0.020-0.050 0.090 Keay Brook1 0.045-0.06 0.085-0.11 Little Ossipee River 0.015-0.057 0.060-0.100 Little Ossipee River (Limington) 0.020-0.060 0.045-0.125 Little River 0.020-0.050 0.050-0.090 Little River (Cornish) 0.035-0.05 0.08-0.10 Little River(Berwick)1 0.045-0.075 0.05-0.15 Littlefield River 0.030-0.045 0.055-0.110 Merriland River 0.013-0.050 0.050-0.090 Mill Brook 0.013-0.050 0.050-0.090 Moors Brook 0.020-0.050 0.050-0.090 Mousam River (Alfred) 0.030-0.070 0.070-0.080 Mousam River (Kennebunk)1 0.038-0.045 0.09-0.11 Mousam River (Lower Reach) 0.03-0.07 0.07-0.08 Mulloy Brook1 0.045-0.06 0.09

1Updated calculations for this countywide study

60 Table 1 27

Table 1. Peak water-surface elevations for April 2007 flood in York and Cumberland Counties, Maine.—Continued

Site HWM Easting Northing Elevation Water body Location and description number number (feet) (feet) (feet) 16 55 5778 9 Merriland River 16 5; 575875 186282.3 23.50 Merriland River 16 59 579; 186375.3 5 Merriland River RR Br US from Rt. 1, US RE1 16 57 5777 186372.1 58 Merriland River RR Br US from Rt. 1, US RE2

17 5 59 8 ;5 Branch Brook

18 5 ;7 9587 7959 Stackpole Brook Simpson Rd., US RE 18 50 2857251.1 958 63.72 Stackpole Brook

51 ;9 227721.0 559 Kennebunk River ; 52 ; 779 59 Kennebunk River ; 53 ;7 227731.8 577 Kennebunk River ; 20 ;5 955 227871.3 125.30 Kennebunk River ; 20 55 2836160.6 227768.7 133.13 Kennebunk River Rt. 35, US RE1 21 56 2850061.2 ;58 70.33 Kennebunk River 21 57 ;88; 5577 70.70 Kennebunk River 22 58 ;7795 879 5 Kennebunk River 22 ; 2857107.2 207786.7 55 Kennebunk River Rt. 1, US RE

23 60 75 212320.3 58 Great Works River F 23 61 7 58; 233.36 Great Works River Old Mill Rd., US LE 5 62 7;9;5 203635.1 220.20 Great Works River 5 63 7;9 203717.6 223.82 Great Works River 25 95 7;5 98 188.11 Great Works River Ford Quint Rd., US LE 25 65 757 99 188.57 Great Works River Ford Quint Rd., US RE 25 66 757; 95 187.00 Great Works River IJ 26 67 775 182553.0 178.36 Great Works River Oak Woods Rd., US RE 26 68 77;5 59 7;55 Great Works River F 27 9 2800512.2 795 5; Great Works River 5 27 70 88785 778;75 131.58 Great Works River 5 28 71 2800865.6 77 ;5 Great Works River N 72 885 151303.7 5;; Great Works River P 73 858;7 151236.1 78 Great Works River Hoopers Sands Rd.-Emerys Br., US LE 30 75 88; 171108.5 8 Great Works River 30 75 2800786.8 171051.0 9 Great Works River 31 76 7958 588;97 83.80 Great Works River 9 31 77 79 58857 57 Great Works River Rt. 236., US LE 32 78 758 587 82.38 Great Works River 32 7 755 5;98 82.06 Great Works River

33 80 77599 ;77 ;; X Rt. 11, US LE 33 81 777 ;855 555.50 X 33 82 2771871.0 ;855 ;;55 X

5 83 7998; 281713.5 578 Little Ossipee River 5 5 7958 281752.0 5795 Little Ossipee River Rt. 11, US RE1 5 85 79;57 7;85 5;; Little Ossipee River Rt. 11, US RE2 Kennebunk River at Rte 1 near Kennebunk, ME — Indirect Summary

Type of Computation: Contracted opening under a bridge Type IV (vertical abutments and sloping embankments with wingwalls) HEC-RAS (version 4.0.0)

Location of Site The Kennebunk River crosses Rte 1 about 1 mile north of where rte 35 crosses rte 1 in the center of Kennebunk.

Survey of Site: 4/20/2007— GJS and LEF located & marked HWMs  One HWM was found 50 ft US on the RE in a 4 inch birch tree in a bunch of alders and was marked with a nail and flagging (accuracy of +/-0.1).  One HWM was found 45 ft DS 45 ft from RE at the base of a 4 in hardwood and marked with a nail and flagging (accuracy of +/-.2).

5/1/07 –JPK and LHC surveyed the HWMs

6/19/07 –JPK PJL, JMC surveyed Cross Sections for an indirect measurement, including an approach section, an US face, a low road, a DS face and an exit cross section.

Equipment Used: Leica Total Station TCR1105 Serial#: 629546 serviced 6/27/06 by Maine Tech Source High Precision GPS System 1200 Serial # Base: 460268; Serial # Rover: 460272

Discharge and HWM Elevation: Peak Discharge = 5730 cfs US LE HWM95 = 44.92 NAVD88 DS LE HWM98 = 42.88 NAVD88

Drainage Area: 42.4 mi2 at Rte 1. Drainage area determined in GIS. Unit Discharge: 135 cfsm

Nature of Antecedent Conditions & Storm: The April 2007 storm, which is commonly referred to in Maine as the Patriots’ Day Storm, produced strong winds, tornadoes, high waves, beach erosion, and riverine and coastal flooding in communities from South Carolina to Maine from April 15 through 18, 2007. The storm, resulting from a major low-pressure system, reached peak intensity on April 16 off the coast of New Jersey but still produced up to 8.5 in. of rain in southern Maine. The storm produced hurricane-force winds and extreme rainfall in Maine, causing storm surges and flooding in coastal areas and extensive flooding of streams and rivers inland. The reduction in snowpack water content from April 9 to April 19 averaged 1 in. throughout most of York and Cumberland Counties and augmented runoff from storm precipitation.

Digital files located at V:\Flood Report 2007\2007 Indirect models Kennebunk-Arundel, Bartlett Plan: Plan 28 5/20/2016 Stream Reach 55 Legend

EG 2007 WS 2007

Crit 2007

50 Ground OWS 2007

45

40 Elevation (ft)

35

30

25 0 100 200 300 400 500

Main Channel Distance (ft)

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.45 38.33 0.12 0.00 73.85 416.00 2.71 Reach 423.3771 10 yr 41.21 40.99 0.09 0.01 109.13 19.88 1358.74 5.48 3.79 Reach 423.3771 25 yr 41.90 41.65 0.09 0.01 116.13 41.56 1664.29 11.45 4.06 Reach 423.3771 50 yr 42.37 42.10 0.09 0.01 119.67 61.46 1893.26 17.18 4.26 Reach 423.3771 100 yr 42.85 42.55 0.09 0.01 123.21 84.83 2134.64 24.43 4.45 Reach 423.3771 500 yr 43.88 43.53 0.09 0.02 130.89 147.72 2699.90 46.08 4.86 Reach 423.3771 2007 45.48 45.04 0.09 0.03 145.68 282.36 3723.99 93.65 5.53

Reach 383.3732 1.1 yr 38.33 38.19 36.95 0.15 0.05 66.18 0.11 415.89 3.00 Reach 383.3732 10 yr 41.11 40.80 38.41 0.14 0.12 101.54 56.46 1327.64 4.56 Reach 383.3732 25 yr 41.80 41.44 38.82 0.13 0.13 107.40 91.89 1625.41 4.94 Reach 383.3732 50 yr 42.27 41.87 39.13 0.13 0.13 109.82 123.32 1848.58 5.22 Reach 383.3732 100 yr 42.74 42.31 39.44 0.13 0.14 112.36 158.88 2085.02 5.49 Reach 383.3732 500 yr 43.77 43.24 40.13 0.14 0.16 118.51 250.45 2643.25 6.09 Reach 383.3732 2007 45.36 44.65 41.13 0.14 0.15 129.01 430.82 3669.18 7.10

Reach 325 BR U 1.1 yr 38.13 37.48 37.33 1.05 0.08 37.89 416.00 6.45 Reach 325 BR U 10 yr 40.85 39.32 39.32 1.09 0.25 55.88 27.10 1357.00 10.01 Reach 325 BR U 25 yr 41.54 39.88 39.88 1.23 0.21 61.95 64.14 1653.16 10.53 Reach 325 BR U 50 yr 42.00 40.26 40.26 1.26 0.20 64.29 104.38 1867.52 10.85 Reach 325 BR U 100 yr 42.47 40.62 40.62 1.30 0.20 65.85 151.15 2092.75 11.26 Reach 325 BR U 500 yr 43.47 41.37 41.37 1.18 0.29 69.59 277.35 2616.35 12.17 Reach 325 BR U 2007 45.07 42.89 42.61 0.95 0.32 72.66 627.37 3472.64 12.65

Reach 325 BR D 1.1 yr 37.00 36.61 35.92 0.25 0.00 42.12 416.00 5.00 Reach 325 BR D 10 yr 39.42 38.72 37.94 0.18 0.07 72.31 206.67 1177.43 7.17 Reach 325 BR D 25 yr 39.88 38.93 38.35 0.23 0.10 72.33 276.18 1441.12 8.38 Reach 325 BR D 50 yr 40.26 39.20 38.63 0.24 0.12 72.35 344.22 1627.69 8.93 Reach 325 BR D 100 yr 40.66 39.48 38.92 0.24 0.13 72.38 421.66 1822.24 9.43 Reach 325 BR D 500 yr 41.75 40.60 39.54 0.19 0.13 72.47 663.34 2230.36 9.44 Reach 325 BR D 2007 43.80 42.68 40.56 0.13 0.13 72.65 1143.70 2956.30 9.33

Reach 290.5356 1.1 yr 36.74 36.36 35.83 0.17 0.04 55.39 416.00 4.93 Reach 290.5356 10 yr 39.18 38.71 37.61 0.11 0.00 105.25 234.06 1141.13 8.92 5.91 Reach 290.5356 25 yr 39.55 38.93 37.98 0.14 0.00 107.32 307.32 1395.81 14.16 6.86 Reach 290.5356 50 yr 39.91 39.23 38.23 0.15 0.00 109.33 375.97 1575.08 20.84 7.25 Reach 290.5356 100 yr 40.29 39.55 38.49 0.15 0.00 110.76 452.56 1762.34 29.00 7.60 Reach 290.5356 500 yr 41.43 40.72 39.04 0.11 0.00 118.32 671.23 2164.29 58.18 7.55 Reach 290.5356 2007 43.54 42.85 39.92 0.07 0.02 130.27 1081.53 2901.06 117.41 7.52

Reach 273.9258 1.1 yr 36.52 36.29 35.25 0.51 0.08 63.38 416.00 0.00 3.85 Reach 273.9258 10 yr 39.06 38.61 37.03 0.36 0.06 113.67 96.21 1266.74 21.16 5.62 Reach 273.9258 25 yr 39.41 38.77 37.63 0.42 0.03 115.29 130.71 1557.30 29.29 6.66 Reach 273.9258 50 yr 39.76 39.05 37.93 0.47 0.04 117.92 169.66 1762.38 39.87 7.12 Reach 273.9258 100 yr 40.13 39.34 38.21 0.37 0.03 120.79 215.16 1974.82 53.92 7.53 Reach 273.9258 500 yr 41.32 40.61 38.84 0.21 0.08 128.08 369.27 2393.00 131.43 7.33 Reach 273.9258 2007 43.45 42.82 39.86 0.12 0.09 137.68 649.05 3118.79 332.15 7.12

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.45 38.33 0.12 0.00 73.85 416.00 2.71 Reach 423.3771 10 yr 41.21 40.99 0.09 0.01 109.13 19.88 1358.74 5.48 3.79 Reach 423.3771 25 yr 41.90 41.65 0.09 0.01 116.13 41.56 1664.29 11.45 4.06 Reach 423.3771 50 yr 42.37 42.10 0.09 0.01 119.67 61.46 1893.26 17.18 4.26 Reach 423.3771 100 yr 42.85 42.55 0.09 0.01 123.21 84.83 2134.64 24.43 4.45 Reach 423.3771 500 yr 43.88 43.53 0.09 0.02 130.89 147.72 2699.90 46.08 4.86 Reach 423.3771 2007 45.74 45.33 0.08 0.03 149.10 295.13 3705.16 99.71 5.33

Reach 383.3732 1.1 yr 38.33 38.19 36.95 0.15 0.05 66.18 0.11 415.89 3.00 Reach 383.3732 10 yr 41.11 40.80 38.41 0.14 0.12 101.54 56.46 1327.64 4.56 Reach 383.3732 25 yr 41.80 41.44 38.84 0.13 0.13 107.40 91.89 1625.41 4.94 Reach 383.3732 50 yr 42.27 41.87 39.12 0.13 0.13 109.82 123.32 1848.58 5.22 Reach 383.3732 100 yr 42.74 42.31 39.44 0.13 0.14 112.36 158.88 2085.02 5.49 Reach 383.3732 500 yr 43.77 43.24 40.13 0.14 0.16 118.51 250.46 2643.24 6.09 Reach 383.3732 2007 45.63 44.98 41.13 131.57 446.37 3653.63 6.82

Reach 325 BR U 1.1 yr 38.13 37.48 37.33 1.05 0.08 37.89 416.00 6.45 Reach 325 BR U 10 yr 40.85 39.32 39.32 1.09 0.25 55.88 27.10 1357.00 10.01 Reach 325 BR U 25 yr 41.54 39.88 39.88 1.23 0.21 61.95 64.14 1653.16 10.53 Reach 325 BR U 50 yr 42.00 40.26 40.26 1.26 0.20 64.29 104.38 1867.52 10.85 Reach 325 BR U 100 yr 42.47 40.62 40.62 1.33 0.19 65.85 151.15 2092.75 11.26 Reach 325 BR U 500 yr 43.47 41.37 41.37 1.50 0.14 69.59 277.35 2616.35 12.17 Reach 325 BR U 2007 45.65 44.34 42.61 72.78 802.88 3297.12 9.96

Reach 325 BR D 1.1 yr 37.00 36.61 35.92 0.25 0.00 42.12 416.00 5.00 Reach 325 BR D 10 yr 39.42 38.72 37.94 0.18 0.07 72.31 206.67 1177.43 7.17 Reach 325 BR D 25 yr 39.88 38.93 38.35 0.23 0.10 72.33 276.18 1441.12 8.38 Reach 325 BR D 50 yr 40.26 39.20 38.63 0.24 0.12 72.35 344.23 1627.67 8.93 Reach 325 BR D 100 yr 40.64 39.42 38.92 0.25 0.14 72.37 415.20 1828.70 9.58 Reach 325 BR D 500 yr 41.47 39.83 39.54 0.30 0.20 72.41 586.03 2307.67 11.16 Reach 325 BR D 2007 42.92 40.56 40.56 72.47 935.54 3164.46 13.47

Reach 290.5356 1.1 yr 36.74 36.36 35.83 0.17 0.04 55.39 416.00 4.93 Reach 290.5356 10 yr 39.18 38.71 37.61 0.11 0.00 105.25 234.06 1141.13 8.92 5.91 Reach 290.5356 25 yr 39.55 38.93 37.98 0.14 0.00 107.32 307.32 1395.81 14.16 6.86 Reach 290.5356 50 yr 39.91 39.23 38.23 0.15 0.00 109.34 375.98 1575.07 20.85 7.25 Reach 290.5356 100 yr 40.25 39.48 38.49 0.16 0.01 110.46 447.67 1768.30 27.93 7.73 Reach 290.5356 500 yr 40.97 39.99 39.04 0.19 0.01 112.73 621.35 2226.35 46.00 8.81 Reach 290.5356 2007 42.19 40.80 39.92 0.24 0.03 118.90 958.07 3057.71 84.22 10.52

Reach 273.9258 1.1 yr 36.52 36.29 35.25 0.51 0.08 63.38 416.00 0.00 3.85 Reach 273.9258 10 yr 39.06 38.61 37.03 0.36 0.06 113.67 96.21 1266.74 21.16 5.62 Reach 273.9258 25 yr 39.41 38.77 37.63 0.42 0.03 115.29 130.71 1557.30 29.29 6.66 Reach 273.9258 50 yr 39.76 39.05 37.93 0.47 0.04 117.92 169.67 1762.36 39.87 7.12 Reach 273.9258 100 yr 40.08 39.25 38.21 0.49 0.04 119.94 208.88 1983.69 51.32 7.69 Reach 273.9258 500 yr 40.77 39.65 38.84 0.57 0.02 123.74 304.46 2507.10 82.14 9.01 Reach 273.9258 2007 41.92 40.19 39.86 0.72 0.05 126.48 487.23 3456.82 155.95 11.31

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.45 38.33 0.12 0.00 73.85 416.00 2.71 Reach 423.3771 10 yr 41.21 40.99 0.09 0.01 109.13 19.88 1358.74 5.48 3.79 Reach 423.3771 25 yr 41.90 41.65 0.09 0.01 116.13 41.56 1664.29 11.45 4.06 Reach 423.3771 50 yr 42.37 42.10 0.09 0.01 119.67 61.46 1893.26 17.18 4.26 Reach 423.3771 100 yr 42.85 42.55 0.09 0.01 123.21 84.83 2134.64 24.43 4.45 Reach 423.3771 500 yr 43.88 43.53 0.09 0.02 130.89 147.72 2699.90 46.08 4.86 Reach 423.3771 2007 45.48 45.04 0.09 0.03 145.66 282.27 3724.12 93.61 5.53

Reach 383.3732 1.1 yr 38.33 38.19 36.94 0.15 0.05 66.19 0.11 415.89 2.99 Reach 383.3732 10 yr 41.11 40.80 38.41 0.14 0.12 101.54 56.46 1327.64 4.56 Reach 383.3732 25 yr 41.80 41.44 38.82 0.13 0.13 107.40 91.89 1625.41 4.94 Reach 383.3732 50 yr 42.27 41.87 39.13 0.13 0.13 109.82 123.32 1848.58 5.22 Reach 383.3732 100 yr 42.74 42.31 39.44 0.13 0.14 112.36 158.88 2085.02 5.49 Reach 383.3732 500 yr 43.77 43.24 40.13 0.14 0.16 118.51 250.46 2643.25 6.09 Reach 383.3732 2007 45.36 44.65 41.13 0.14 0.15 128.99 430.71 3669.29 7.10

Reach 325 BR U 1.1 yr 38.13 37.49 37.33 1.11 0.07 37.90 416.00 6.43 Reach 325 BR U 10 yr 40.85 39.32 39.32 1.40 0.16 55.88 27.10 1357.00 10.01 Reach 325 BR U 25 yr 41.54 39.88 39.88 1.44 0.14 61.95 64.14 1653.16 10.53 Reach 325 BR U 50 yr 42.00 40.26 40.26 1.46 0.12 64.29 104.38 1867.52 10.85 Reach 325 BR U 100 yr 42.47 40.62 40.62 1.43 0.14 65.85 151.15 2092.75 11.26 Reach 325 BR U 500 yr 43.47 41.37 41.37 1.25 0.26 69.59 277.35 2616.35 12.17 Reach 325 BR U 2007 45.06 42.81 42.61 0.99 0.33 72.66 614.60 3485.40 12.86

Reach 325 BR D 1.1 yr 36.95 36.53 35.92 0.36 0.02 41.61 416.00 5.18 Reach 325 BR D 10 yr 39.21 38.21 37.94 0.31 0.08 72.27 161.31 1222.79 8.46 Reach 325 BR D 25 yr 39.76 38.57 38.35 0.32 0.11 72.30 240.82 1476.48 9.33 Reach 325 BR D 50 yr 40.16 38.82 38.63 0.33 0.14 72.32 305.47 1666.43 9.93 Reach 325 BR D 100 yr 40.58 39.20 38.92 0.30 0.15 72.35 392.75 1851.15 10.14 Reach 325 BR D 500 yr 41.67 40.42 39.54 0.21 0.14 72.46 646.81 2246.89 9.80 Reach 325 BR D 2007 43.73 42.59 40.56 0.14 0.13 72.64 1136.27 2963.73 9.47

Reach 290.5356 1.1 yr 36.57 35.98 35.83 0.58 0.01 52.01 416.00 6.13 Reach 290.5356 10 yr 38.82 38.10 37.61 0.33 0.07 100.05 186.89 1194.34 2.87 7.25 Reach 290.5356 25 yr 39.33 38.51 37.98 0.30 0.05 103.30 272.98 1436.16 8.16 7.82 Reach 290.5356 50 yr 39.69 38.80 38.23 0.28 0.04 106.11 341.61 1616.13 14.16 8.19 Reach 290.5356 100 yr 40.13 39.25 38.49 0.20 0.01 109.45 429.98 1789.76 24.16 8.20 Reach 290.5356 500 yr 41.31 40.55 39.04 0.12 0.00 117.12 660.58 2177.61 55.51 7.82 Reach 290.5356 2007 43.46 42.75 39.92 0.07 0.02 129.87 1077.33 2906.45 116.22 7.62

Reach 273.9258 1.1 yr 35.98 35.25 35.25 1.70 0.00 41.27 416.00 6.87 Reach 273.9258 10 yr 38.42 37.03 37.03 0.50 0.32 79.50 1.35 1379.80 2.95 9.46 Reach 273.9258 25 yr 38.98 37.63 37.63 0.35 0.32 106.32 42.80 1663.48 11.02 9.44 Reach 273.9258 50 yr 39.37 38.05 37.93 0.30 0.32 108.81 88.71 1863.09 20.10 9.45 Reach 273.9258 100 yr 39.91 38.91 38.21 0.25 0.23 116.63 182.43 2019.66 41.81 8.39 Reach 273.9258 500 yr 41.19 40.41 38.84 0.15 0.17 127.30 357.44 2414.98 121.28 7.63 Reach 273.9258 2007 43.38 42.72 39.86 0.09 0.14 136.77 645.09 3128.42 326.50 7.22

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.45 38.33 0.12 0.00 73.85 416.00 2.71 Reach 423.3771 10 yr 41.21 40.99 0.09 0.01 109.13 19.88 1358.74 5.48 3.79 Reach 423.3771 25 yr 41.90 41.65 0.09 0.01 116.13 41.56 1664.29 11.45 4.06 Reach 423.3771 50 yr 42.37 42.10 0.09 0.01 119.67 61.46 1893.26 17.18 4.26 Reach 423.3771 100 yr 42.85 42.55 0.09 0.01 123.21 84.83 2134.64 24.43 4.45 Reach 423.3771 500 yr 44.11 43.79 0.08 0.02 132.84 157.23 2686.33 50.14 4.66 Reach 423.3771 2007 45.74 45.33 0.08 0.03 149.10 295.13 3705.16 99.71 5.33

Reach 383.3732 1.1 yr 38.33 38.19 36.94 0.15 0.05 66.19 0.11 415.89 2.99 Reach 383.3732 10 yr 41.11 40.80 38.41 0.14 0.12 101.54 56.46 1327.64 4.56 Reach 383.3732 25 yr 41.80 41.44 38.83 0.13 0.13 107.40 91.89 1625.41 4.94 Reach 383.3732 50 yr 42.27 41.87 39.14 0.13 0.13 109.82 123.32 1848.58 5.22 Reach 383.3732 100 yr 42.74 42.31 39.44 0.13 0.14 112.36 158.88 2085.02 5.49 Reach 383.3732 500 yr 44.01 43.53 40.13 120.42 263.14 2630.56 5.83 Reach 383.3732 2007 45.63 44.98 41.15 131.57 446.37 3653.63 6.82

Reach 325 BR U 1.1 yr 38.13 37.49 37.33 1.11 0.07 37.90 416.00 6.43 Reach 325 BR U 10 yr 40.85 39.32 39.32 1.40 0.16 55.88 27.10 1357.00 10.01 Reach 325 BR U 25 yr 41.54 39.88 39.88 1.44 0.14 61.95 64.14 1653.16 10.53 Reach 325 BR U 50 yr 42.00 40.26 40.26 1.45 0.13 64.29 104.38 1867.52 10.85 Reach 325 BR U 100 yr 42.47 40.62 40.62 1.48 0.12 65.85 151.15 2092.75 11.26 Reach 325 BR U 500 yr 44.03 42.99 41.37 72.67 452.22 2441.48 8.77 Reach 325 BR U 2007 45.65 44.34 42.61 72.78 802.88 3297.12 9.96

Reach 325 BR D 1.1 yr 36.95 36.53 35.92 0.36 0.02 41.61 416.00 5.18 Reach 325 BR D 10 yr 39.21 38.21 37.94 0.31 0.08 72.27 161.31 1222.79 8.46 Reach 325 BR D 25 yr 39.76 38.57 38.35 0.32 0.11 72.30 240.82 1476.48 9.33 Reach 325 BR D 50 yr 40.16 38.85 38.63 0.32 0.13 72.32 308.34 1663.57 9.85 Reach 325 BR D 100 yr 40.56 39.11 38.92 0.32 0.16 72.35 382.52 1861.38 10.39 Reach 325 BR D 500 yr 41.44 39.54 39.54 72.38 551.18 2342.52 11.98 Reach 325 BR D 2007 42.92 40.56 40.56 72.47 935.54 3164.46 13.47

Reach 290.5356 1.1 yr 36.57 35.98 35.83 0.58 0.01 52.01 416.00 6.13 Reach 290.5356 10 yr 38.82 38.10 37.61 0.33 0.07 100.05 186.89 1194.34 2.87 7.25 Reach 290.5356 25 yr 39.33 38.51 37.98 0.30 0.05 103.30 272.98 1436.16 8.16 7.82 Reach 290.5356 50 yr 39.70 38.83 38.23 0.29 0.06 106.41 344.39 1612.84 14.67 8.11 Reach 290.5356 100 yr 40.08 39.16 38.49 0.28 0.06 109.03 422.06 1799.31 22.54 8.41 Reach 290.5356 500 yr 40.90 39.84 39.04 0.27 0.07 112.08 609.60 2240.84 43.26 9.12 Reach 290.5356 2007 42.21 40.86 39.92 0.26 0.07 119.26 962.23 3052.48 85.28 10.42

Reach 273.9258 1.1 yr 35.98 35.25 35.25 1.70 0.00 41.27 416.00 6.87 Reach 273.9258 10 yr 38.42 37.03 37.03 1.37 0.05 79.50 1.35 1379.80 2.95 9.46 Reach 273.9258 25 yr 38.98 37.63 37.63 1.18 0.00 106.32 42.80 1663.48 11.02 9.44 Reach 273.9258 50 yr 39.36 37.93 37.93 1.17 0.03 108.11 77.75 1876.23 17.92 9.81 Reach 273.9258 100 yr 39.74 38.21 38.21 1.17 0.04 109.96 117.62 2100.14 26.14 10.23 Reach 273.9258 500 yr 40.57 38.84 38.84 1.12 0.06 115.88 226.92 2615.46 51.32 11.04 Reach 273.9258 2007 41.88 39.86 39.86 1.07 0.06 125.27 454.16 3515.75 130.09 12.18

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.15 37.98 0.24 0.01 72.13 416.00 3.26 Reach 423.3771 10 yr 40.45 40.10 0.19 0.01 95.78 7.24 1375.15 1.70 4.75 Reach 423.3771 25 yr 41.02 40.62 0.19 0.02 103.51 17.31 1695.42 4.57 5.15 Reach 423.3771 50 yr 41.44 41.00 0.19 0.02 109.26 28.53 1935.50 7.87 5.39 Reach 423.3771 100 yr 41.87 41.39 0.18 0.02 114.08 44.98 2186.46 12.47 5.61 Reach 423.3771 500 yr 42.87 42.34 0.17 0.02 121.52 100.39 2764.84 28.47 5.97 Reach 423.3771 2007 44.69 44.12 0.13 0.02 135.52 239.38 3782.69 77.93 6.29

Reach 383.3732 1.1 yr 37.90 37.68 36.95 0.23 0.02 60.19 416.00 3.78 Reach 383.3732 10 yr 40.24 39.75 38.40 0.17 0.03 90.98 24.71 1347.76 11.63 5.72 Reach 383.3732 25 yr 40.81 40.24 38.82 0.18 0.04 96.30 49.31 1647.72 20.28 6.21 Reach 383.3732 50 yr 41.23 40.61 39.11 0.18 0.05 99.85 73.03 1868.84 30.03 6.49 Reach 383.3732 100 yr 41.67 41.00 39.42 0.18 0.05 103.42 100.97 2101.41 41.52 6.73 Reach 383.3732 500 yr 42.68 41.95 40.09 0.16 0.06 110.27 176.80 2644.21 72.69 7.16 Reach 383.3732 2007 44.54 43.74 41.07 0.12 0.06 121.91 338.23 3622.70 139.06 7.57

Reach 325 BR U 1.1 yr 37.66 37.24 36.97 0.67 0.04 53.69 416.00 5.15 Reach 325 BR U 10 yr 40.04 39.23 38.50 0.58 0.04 70.46 14.72 1369.38 7.24 Reach 325 BR U 25 yr 40.59 39.59 38.95 0.69 0.02 70.46 30.83 1686.47 8.07 Reach 325 BR U 50 yr 41.01 39.91 39.28 0.73 0.00 70.46 47.25 1924.66 8.51 Reach 325 BR U 100 yr 41.44 40.24 39.58 0.74 0.00 70.46 67.13 2176.77 8.90 Reach 325 BR U 500 yr 42.47 41.15 40.23 0.65 0.00 72.46 127.55 2766.15 9.38 Reach 325 BR U 2007 44.36 42.98 41.32 0.48 0.00 74.46 244.43 3855.57 9.67

Reach 325 BR D 1.1 yr 36.95 36.67 35.83 0.20 0.01 45.54 416.00 4.24 Reach 325 BR D 10 yr 39.42 38.74 37.66 0.16 0.03 68.46 59.52 1314.29 10.29 6.76 Reach 325 BR D 25 yr 39.88 38.94 38.11 0.21 0.05 68.46 79.95 1621.08 16.27 7.95 Reach 325 BR D 50 yr 40.28 39.18 38.42 0.22 0.07 70.46 93.87 1854.76 23.27 8.63 Reach 325 BR D 100 yr 40.69 39.46 38.75 0.23 0.09 70.46 117.76 2094.15 31.99 9.19 Reach 325 BR D 500 yr 41.81 40.52 39.44 0.18 0.13 70.46 193.66 2637.12 62.92 9.51 Reach 325 BR D 2007 43.88 42.51 40.53 0.12 0.17 74.46 324.46 3650.78 124.76 9.86

Reach 290.5356 1.1 yr 36.74 36.36 35.83 0.17 0.04 55.39 416.00 4.93 Reach 290.5356 10 yr 39.22 38.66 37.69 0.13 0.02 104.70 158.36 1217.66 8.08 6.39 Reach 290.5356 25 yr 39.62 38.84 38.09 0.17 0.03 106.48 210.27 1494.40 12.63 7.50 Reach 290.5356 50 yr 39.98 39.11 38.35 0.18 0.03 108.77 262.54 1689.81 19.56 7.97 Reach 290.5356 100 yr 40.37 39.43 38.63 0.18 0.02 110.25 323.18 1890.70 30.01 8.34 Reach 290.5356 500 yr 41.51 40.64 39.24 0.13 0.02 117.75 504.83 2313.06 75.81 8.18 Reach 290.5356 2007 43.59 42.80 40.17 0.08 0.02 130.05 834.17 3051.38 214.45 7.96

Reach 273.9258 1.1 yr 36.52 36.29 0.51 0.08 63.38 416.00 0.00 3.85 Reach 273.9258 10 yr 39.07 38.59 0.38 0.06 113.48 68.61 1294.18 21.32 5.77 Reach 273.9258 25 yr 39.42 38.74 0.45 0.03 114.94 93.45 1594.62 29.23 6.88 Reach 273.9258 50 yr 39.78 39.00 0.50 0.04 117.46 122.92 1809.29 39.68 7.38 Reach 273.9258 100 yr 40.17 39.31 0.39 0.05 120.48 159.29 2030.24 54.38 7.79 Reach 273.9258 500 yr 41.36 40.56 0.22 0.11 127.90 282.79 2477.45 133.46 7.64 Reach 273.9258 2007 43.49 42.76 0.12 0.12 137.17 512.44 3260.89 326.67 7.49

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.15 37.98 0.24 0.01 72.13 416.00 3.26 Reach 423.3771 10 yr 40.45 40.10 0.19 0.01 95.78 7.24 1375.15 1.70 4.75 Reach 423.3771 25 yr 41.02 40.62 0.19 0.02 103.51 17.31 1695.42 4.57 5.15 Reach 423.3771 50 yr 41.44 41.00 0.19 0.02 109.26 28.53 1935.50 7.87 5.39 Reach 423.3771 100 yr 41.87 41.39 0.18 0.02 114.06 44.90 2186.55 12.45 5.61 Reach 423.3771 500 yr 43.16 42.70 0.13 0.02 124.36 115.43 2744.66 33.61 5.59 Reach 423.3771 2007 44.72 44.15 0.13 0.02 135.79 240.84 3780.70 78.46 6.26

Reach 383.3732 1.1 yr 37.90 37.68 36.95 0.23 0.02 60.19 416.00 3.78 Reach 383.3732 10 yr 40.24 39.75 38.40 0.17 0.03 90.98 24.71 1347.76 11.63 5.72 Reach 383.3732 25 yr 40.81 40.24 38.83 0.18 0.04 96.30 49.31 1647.72 20.28 6.21 Reach 383.3732 50 yr 41.23 40.61 39.11 0.18 0.05 99.85 73.03 1868.84 30.03 6.49 Reach 383.3732 100 yr 41.67 41.00 39.42 0.18 0.05 103.39 100.85 2101.59 41.47 6.74 Reach 383.3732 500 yr 43.01 42.39 40.09 112.94 194.84 2618.76 80.11 6.61 Reach 383.3732 2007 44.57 43.77 41.06 122.19 339.62 3620.76 139.63 7.54

Reach 325 BR U 1.1 yr 37.66 37.24 36.97 0.67 0.04 53.69 416.00 5.15 Reach 325 BR U 10 yr 40.04 39.23 38.50 0.58 0.04 70.46 14.72 1369.38 7.24 Reach 325 BR U 25 yr 40.59 39.59 38.95 0.69 0.02 70.46 30.83 1686.47 8.07 Reach 325 BR U 50 yr 41.01 39.91 39.28 0.73 0.00 70.46 47.25 1924.65 8.51 Reach 325 BR U 100 yr 41.44 40.23 39.58 0.77 0.01 70.46 66.86 2177.04 8.92 Reach 325 BR U 500 yr 42.96 42.01 40.23 74.46 144.33 2749.37 8.00 Reach 325 BR U 2007 44.54 43.28 41.32 74.46 254.53 3845.47 9.25

Reach 325 BR D 1.1 yr 36.95 36.67 35.83 0.20 0.01 45.54 416.00 4.24 Reach 325 BR D 10 yr 39.42 38.74 37.66 0.16 0.03 68.46 59.52 1314.29 10.29 6.76 Reach 325 BR D 25 yr 39.88 38.94 38.11 0.21 0.05 68.46 79.95 1621.08 16.27 7.95 Reach 325 BR D 50 yr 40.28 39.18 38.42 0.22 0.07 70.46 93.88 1854.75 23.27 8.63 Reach 325 BR D 100 yr 40.66 39.37 38.75 0.25 0.09 70.46 114.56 2098.97 30.37 9.37 Reach 325 BR D 500 yr 41.51 39.44 39.44 70.46 150.91 2702.02 40.77 11.91 Reach 325 BR D 2007 43.12 40.53 40.53 70.46 275.05 3735.46 89.49 13.44

Reach 290.5356 1.1 yr 36.74 36.36 35.83 0.17 0.04 55.39 416.00 4.93 Reach 290.5356 10 yr 39.22 38.66 37.69 0.13 0.02 104.70 158.36 1217.66 8.08 6.39 Reach 290.5356 25 yr 39.62 38.84 38.09 0.17 0.03 106.48 210.27 1494.40 12.63 7.50 Reach 290.5356 50 yr 39.98 39.11 38.35 0.18 0.03 108.77 262.55 1689.79 19.56 7.97 Reach 290.5356 100 yr 40.32 39.33 38.63 0.19 0.02 109.79 315.59 1900.83 27.48 8.57 Reach 290.5356 500 yr 41.07 39.75 39.24 0.24 0.01 111.65 443.85 2401.29 48.56 9.95 Reach 290.5356 2007 42.38 40.62 40.17 0.30 0.02 117.63 713.86 3279.82 106.31 11.63

Reach 273.9258 1.1 yr 36.52 36.29 0.51 0.08 63.38 416.00 0.00 3.85 Reach 273.9258 10 yr 39.07 38.59 0.38 0.06 113.48 68.61 1294.18 21.32 5.77 Reach 273.9258 25 yr 39.42 38.74 0.45 0.03 114.94 93.45 1594.62 29.23 6.88 Reach 273.9258 50 yr 39.78 39.00 0.50 0.04 117.47 122.94 1809.27 39.69 7.38 Reach 273.9258 100 yr 40.11 39.19 0.53 0.03 119.33 152.08 2041.08 50.74 8.01 Reach 273.9258 500 yr 40.81 39.53 0.63 0.00 122.56 221.58 2592.99 79.13 9.54 Reach 273.9258 2007 42.06 40.08 39.92 0.79 0.12 126.05 364.38 3583.53 152.09 11.95

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.14 37.98 0.24 0.01 72.12 416.00 3.27 Reach 423.3771 10 yr 40.41 40.05 0.20 0.02 95.03 6.71 1375.85 1.55 4.81 Reach 423.3771 25 yr 41.01 40.60 0.20 0.02 103.29 17.04 1695.77 4.49 5.17 Reach 423.3771 50 yr 41.43 40.99 0.19 0.02 109.16 28.37 1935.71 7.82 5.40 Reach 423.3771 100 yr 41.87 41.39 0.18 0.02 114.09 45.04 2186.38 12.48 5.61 Reach 423.3771 500 yr 42.85 42.31 0.17 0.02 121.31 99.22 2766.39 28.09 6.00 Reach 423.3771 2007 44.65 44.08 0.13 0.02 135.07 237.01 3785.93 77.07 6.33

Reach 383.3732 1.1 yr 37.90 37.68 36.94 0.23 0.02 60.17 416.00 3.79 Reach 383.3732 10 yr 40.19 39.68 38.40 0.19 0.04 90.11 22.89 1350.28 10.93 5.84 Reach 383.3732 25 yr 40.80 40.21 38.83 0.19 0.04 96.08 48.39 1649.00 19.90 6.25 Reach 383.3732 50 yr 41.23 40.60 39.11 0.18 0.05 99.77 72.64 1869.40 29.87 6.50 Reach 383.3732 100 yr 41.67 41.01 39.42 0.18 0.05 103.44 101.07 2101.27 41.56 6.73 Reach 383.3732 500 yr 42.66 41.92 40.09 0.17 0.06 110.06 175.29 2646.34 72.07 7.20 Reach 383.3732 2007 44.50 43.68 41.07 0.13 0.06 121.48 336.03 3625.81 138.16 7.63

Reach 325 BR U 1.1 yr 37.65 37.23 36.97 0.73 0.04 53.67 416.00 5.21 Reach 325 BR U 10 yr 39.96 39.06 38.50 0.77 0.01 68.88 10.94 1373.16 7.63 Reach 325 BR U 25 yr 40.56 39.53 38.95 0.82 0.01 70.46 28.79 1688.51 8.20 Reach 325 BR U 50 yr 41.00 39.88 39.28 0.83 0.02 70.46 46.35 1925.55 8.56 Reach 325 BR U 100 yr 41.44 40.25 39.58 0.82 0.02 70.46 67.35 2176.55 8.89 Reach 325 BR U 500 yr 42.43 41.08 40.23 0.71 0.00 72.46 124.79 2768.91 9.53 Reach 325 BR U 2007 44.31 42.90 41.32 0.50 0.00 74.46 241.48 3858.52 9.79

Reach 325 BR D 1.1 yr 36.88 36.58 35.83 0.28 0.03 45.20 416.00 4.43 Reach 325 BR D 10 yr 39.19 38.31 37.66 0.29 0.01 67.18 47.43 1331.63 5.04 7.63 Reach 325 BR D 25 yr 39.73 38.61 38.11 0.31 0.00 68.46 69.45 1637.45 10.40 8.70 Reach 325 BR D 50 yr 40.14 38.85 38.42 0.32 0.03 68.46 88.70 1866.33 16.87 9.35 Reach 325 BR D 100 yr 40.59 39.17 38.75 0.30 0.08 70.46 106.28 2111.41 26.21 9.85 Reach 325 BR D 500 yr 41.72 40.32 39.44 0.20 0.13 70.46 187.32 2646.77 59.61 9.87 Reach 325 BR D 2007 43.81 42.40 40.53 0.12 0.18 74.46 320.99 3656.28 122.73 10.02

Reach 290.5356 1.1 yr 36.57 35.99 35.83 0.58 0.02 52.09 416.00 6.09 Reach 290.5356 10 yr 38.88 37.90 37.69 0.42 0.04 98.80 102.28 1280.04 1.78 8.24 Reach 290.5356 25 yr 39.42 38.30 38.09 0.37 0.03 101.32 166.89 1544.66 5.75 8.87 Reach 290.5356 50 yr 39.80 38.59 38.35 0.35 0.03 104.05 219.46 1741.96 10.48 9.30 Reach 290.5356 100 yr 40.22 39.04 38.63 0.25 0.02 108.32 292.90 1930.42 20.58 9.25 Reach 290.5356 500 yr 41.39 40.43 39.24 0.14 0.02 116.35 493.16 2333.33 67.21 8.54 Reach 290.5356 2007 43.51 42.69 40.17 0.08 0.02 129.60 830.09 3059.60 210.31 8.08

Reach 273.9258 1.1 yr 35.98 35.23 35.23 1.72 0.00 41.18 416.00 6.92 Reach 273.9258 10 yr 38.42 36.99 36.99 0.51 0.34 77.96 1.15 1380.33 2.62 9.61 Reach 273.9258 25 yr 39.02 37.59 37.59 0.36 0.35 106.08 23.83 1682.93 10.55 9.66 Reach 273.9258 50 yr 39.42 37.95 37.91 0.31 0.37 108.19 53.00 1900.47 18.43 9.90 Reach 273.9258 100 yr 39.95 38.84 0.26 0.26 115.96 129.47 2073.51 40.92 8.74 Reach 273.9258 500 yr 41.22 40.35 0.15 0.20 127.06 271.67 2500.19 121.85 7.98 Reach 273.9258 2007 43.41 42.66 0.09 0.17 136.18 508.49 3270.48 321.03 7.61

HEC-RAS Plan: Plan 24 River: Stream Reach: Reach Reach River Sta Profile E.G. Elev W.S. Elev Crit W.S. Frctn Loss C & E Loss Top Width Q Left Q Channel Q Right Vel Chnl (ft) (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft/s) Reach 423.3771 1.1 yr 38.14 37.98 0.24 0.01 72.12 416.00 3.27 Reach 423.3771 10 yr 40.41 40.05 0.20 0.02 95.03 6.71 1375.85 1.55 4.81 Reach 423.3771 25 yr 41.01 40.60 0.20 0.02 103.29 17.04 1695.77 4.49 5.17 Reach 423.3771 50 yr 41.43 40.99 0.19 0.02 109.15 28.37 1935.72 7.81 5.40 Reach 423.3771 100 yr 41.87 41.40 0.18 0.02 114.11 45.14 2186.25 12.51 5.61 Reach 423.3771 500 yr 43.16 42.70 0.13 0.02 124.35 115.39 2744.71 33.60 5.59 Reach 423.3771 2007 44.72 44.15 0.13 0.02 135.79 240.84 3780.70 78.46 6.26

Reach 383.3732 1.1 yr 37.90 37.68 36.94 0.23 0.02 60.17 416.00 3.79 Reach 383.3732 10 yr 40.19 39.68 38.40 0.19 0.04 90.11 22.89 1350.28 10.93 5.84 Reach 383.3732 25 yr 40.80 40.21 38.83 0.19 0.04 96.08 48.39 1649.00 19.90 6.25 Reach 383.3732 50 yr 41.23 40.60 39.11 0.18 0.05 99.76 72.62 1869.42 29.86 6.50 Reach 383.3732 100 yr 41.67 41.01 39.40 0.17 0.05 103.48 101.23 2101.04 41.63 6.73 Reach 383.3732 500 yr 43.01 42.39 40.09 112.93 194.79 2618.82 80.09 6.61 Reach 383.3732 2007 44.57 43.77 41.06 122.19 339.62 3620.76 139.63 7.54

Reach 325 BR U 1.1 yr 37.65 37.23 36.97 0.73 0.04 53.67 416.00 5.21 Reach 325 BR U 10 yr 39.96 39.06 38.50 0.77 0.01 68.88 10.94 1373.16 7.63 Reach 325 BR U 25 yr 40.56 39.53 38.95 0.82 0.01 70.46 28.79 1688.51 8.20 Reach 325 BR U 50 yr 40.99 39.88 39.28 0.83 0.02 70.46 46.31 1925.59 8.57 Reach 325 BR U 100 yr 41.44 40.26 39.58 0.83 0.03 70.46 67.70 2176.20 8.87 Reach 325 BR U 500 yr 42.96 42.01 40.23 74.46 144.28 2749.42 8.00 Reach 325 BR U 2007 44.54 43.28 41.32 74.46 254.53 3845.47 9.25

Reach 325 BR D 1.1 yr 36.88 36.58 35.83 0.28 0.03 45.20 416.00 4.43 Reach 325 BR D 10 yr 39.19 38.31 37.66 0.29 0.01 67.18 47.43 1331.63 5.04 7.63 Reach 325 BR D 25 yr 39.73 38.61 38.11 0.31 0.00 68.46 69.45 1637.45 10.40 8.70 Reach 325 BR D 50 yr 40.15 38.86 38.42 0.32 0.03 68.46 89.02 1865.82 17.06 9.32 Reach 325 BR D 100 yr 40.58 39.11 38.75 0.32 0.07 70.46 103.89 2114.99 25.02 9.98 Reach 325 BR D 500 yr 41.51 39.44 39.44 70.46 150.91 2702.02 40.77 11.91 Reach 325 BR D 2007 43.12 40.53 40.53 70.46 275.05 3735.46 89.49 13.44

Reach 290.5356 1.1 yr 36.57 35.99 35.83 0.58 0.02 52.09 416.00 6.09 Reach 290.5356 10 yr 38.88 37.90 37.69 0.42 0.04 98.80 102.28 1280.04 1.78 8.24 Reach 290.5356 25 yr 39.42 38.30 38.09 0.37 0.03 101.32 166.89 1544.66 5.75 8.87 Reach 290.5356 50 yr 39.80 38.61 38.35 0.36 0.03 104.25 221.34 1739.78 10.78 9.24 Reach 290.5356 100 yr 40.19 38.95 38.63 0.34 0.04 107.47 284.62 1940.65 18.64 9.50 Reach 290.5356 500 yr 41.04 39.64 39.24 0.32 0.04 111.18 435.14 2413.31 45.25 10.21 Reach 290.5356 2007 42.39 40.66 40.17 0.31 0.04 117.90 717.00 3274.25 108.75 11.54

Reach 273.9258 1.1 yr 35.98 35.23 35.23 1.72 0.00 41.18 416.00 6.92 Reach 273.9258 10 yr 38.42 36.99 36.99 1.40 0.07 77.96 1.15 1380.33 2.62 9.61 Reach 273.9258 25 yr 39.02 37.59 37.59 1.21 0.03 106.08 23.83 1682.93 10.55 9.66 Reach 273.9258 50 yr 39.42 37.91 37.91 1.19 0.06 107.99 50.53 1903.58 17.79 10.00 Reach 273.9258 100 yr 39.82 38.20 38.20 1.19 0.07 109.84 80.86 2136.72 26.32 10.44 Reach 273.9258 500 yr 40.68 38.87 38.87 1.13 0.08 116.22 169.29 2670.74 53.68 11.19 Reach 273.9258 2007 42.05 39.93 39.93 1.07 0.09 125.51 351.69 3608.41 139.90 12.35