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Final Environmental Impact Report - Whittier Bridge/I-95 ...

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Appendix 1 – Tables 1, 2, and 3<br />

Table 1. Pertinent “Current Effective” HEC-2 Model Data<br />

Parameter<br />

Attributes<br />

Model Reach Length<br />

28,200 Feet<br />

Ave Channel Length Between 4700 Feet<br />

Cross Sections<br />

No Of Model Cross Sections 7<br />

Ave. Cross Section Length<br />

1820 Feet<br />

Manning’s N Channel (All Cross 0.04<br />

Sections)<br />

Manning’s N Overbanks (All Cross 0.075<br />

Sections<br />

Coefficient Of Contraction (All 0.3<br />

Cross Sections<br />

Coefficient Of Expansion (All 0.4<br />

Cross Sections)<br />

Upstream Water Surface<br />

13.6 Feet, NGVD<br />

Boundary Condition<br />

Downstream Water Surface 8.7 Feet, NGVD (10-Year Tidal<br />

Boundary Condition<br />

Flood Elevation, Newburyport, MA)<br />

Upstream Peak Discharge Flow 115,000 Cubic Feet Per Second<br />

Input<br />

Table 2. Pertinent Existing <strong>Bridge</strong> Geometric Parameters Incorporated In “Pre-<br />

Project (Existing) Conditions” HEC-RAS Model<br />

Parameter<br />

Attributes<br />

Total Clear Span Length<br />

1144 Feet<br />

No. Of Spans 5<br />

Span Length Distribution<br />

Span 5 North<br />

198 Feet<br />

Span 4<br />

308 Feet<br />

Span 3<br />

198 Feet<br />

Span 2<br />

220 Feet<br />

Span 1 South<br />

220eet<br />

Superstructure Depth<br />

Span 5 North<br />

31.4 Feet<br />

Span 4<br />

6.5 Feet<br />

Span 3<br />

31.4 Feet<br />

Span 2<br />

31.4 Feet<br />

Span 1 South<br />

31.4 Feet<br />

Superstructure Deck Width,<br />

110 Feet<br />

Perpendicular To Current<br />

No. of Piers 4<br />

Pier 4 (North) 12.0<br />

Pier 3 12.0<br />

Pier 2 10.5<br />

Pier 1 (South) 10.5<br />

Pier Length, Parallel To Current (All) 110 feet

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