carson city freeway paul m. frost, p.e. principal hydraulic engineer nevada department of...
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Carson City FreewayCarson City Freeway
Paul M. Frost, P.E.Principal Hydraulic Engineer
Nevada Department of Transportation
Mark E. Forest, P.E.Executive Vice-President
WRC Nevada, Inc.
Mahmood Azad, P.E.Development Services Manager
Carson City
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Carson Freeway Phase I - Red
Phase II - Blue
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Phase I - Carson Freeway
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Project HistoryProject History
Corridor Selection Study (1970’s)
Carson City Endorses alignment in 1984 (“Edmonds” alignment, though center of valley)
Right-of-Way acquisition begins in 1986
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Alignment Challenges
Clean Water Act of 1980 (Section 404 - Wetland Issues)
“Species of Concern” - The Carson Wandering Skipper Butterfly
Water Quality Issues (NDEP)
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“Thank you for visiting Carson City”Nevada Appeal, 1999
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Alignment Challenges (cont.)Alignment Challenges (cont.)
Floodplain Impacts– Alignment is at low point in Eagle Valley
(45 sq. mi. watershed, 100-Year = 10,000 cfs– FEMA Floodplains / Floodways
• Published in 1986• 18,000 feet of alignment is in within
regulatory floodplain• 8,000 feet of alignment is in floodway
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Floodway
100-Year Floodplain
Zone B (Shallow)
Carson Freeway
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Floodway
100-Year Floodplain
Zone B(Shallow)
Carson Freeway
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Freeway Design EffortFreeway Design Effort
NDOT Begins Design in 1994
Recognized the necessity for complimentary City and State designs
Carson City and NDOT begin cooperative effort for Freeway and City Master Plan Drainage Design
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Freeway Design Effort (cont.)Freeway Design Effort (cont.)
NDOT / City / WRC Studies– Hydrologic Analysis of Eagle Valley– Galena Creek Watershed Comparison Study– Hydraulic Alternative Development Report
• Included Offsite Detention Alternatives (but only on Public Lands)
– 404(b)(1) Alternatives Report (minimize environmental impacts)
– Lompa Lane Groundwater Analysis
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Water QualityBasin
Open Channel
Collector Channel
Detention Basinat Gravel Pit
Collector Channel
Multi-Cell RCB
Multi-Cell RCB
Single-Cell RCB
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New Years Day Flood, 1997New Years Day Flood, 1997a.k.a. a.k.a. “Then It Rained”“Then It Rained”
Significant event in Eagle Valley
Over a 100-Year event on Vicee Canyon
Major sediment loads
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1997 Flood, continued1997 Flood, continued
Could have been worse – Existing gravel pit on Vicee
acted as retention basin– Roughly __ feet of sediment deposition
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Inter-Local AgreementInter-Local Agreement
1997 event stressed the need for major, comprehensive flood control infrastructure
Through a Partnering Process, Carson City and NDOT cooperate to develop a regional flood control solution
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Carson City Carson City Stormwater Master PlanStormwater Master Plan
1994 Master Plan
401b Alternatives Analysis
Northwest Alternatives Analysis
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Northwest Alternatives StudyNorthwest Alternatives Study
Watershed Area for Phase 1B
Existing Detention – Within Silver Oaks Development (Evaluation)
Detention and Conveyance Alternatives
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Watershed Map
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Contributing Drainage AreaContributing Drainage Area
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Northwest Alternatives StudyNorthwest Alternatives Study
Goals and Purpose:– Regional Flood Control Planning– Integration of Regional Flood Control with
Freeway Project– Reduction in Costs for Freeway– Reduction In Costs for Carson City– Reduction in Environmental Impacts– Significant Reduction in Floodplain Area
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Northwest Alternatives StudyNorthwest Alternatives Study
State/Local/Private Partnership– Nevada Department of Transportation– Carson City– Developers
Advantages– Land Acquisition– Shared Costs– Regional Flood Control Measures Expedited
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Project FeaturesProject Features
Detention Basins– Shenandoah Heights (Carson City)– Eagle Canyon– Silver Oaks (3 Basins with Golf Course)
Conveyance Facilities– Channels– Culverts– Storm Drains
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Project FeaturesProject Features
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Pre-Project Flood Limits
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Post-Project Flood Limits
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Project BenefitsProject Benefits
Reduction in Floodplain/Floodways
Reduction in Facilities Costs
Reduction in Utility Relocation Cost
Reduced Flood Risk to Public Facilities
Reduced Maintenance Costs
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Erosion and Sediment DamagesErosion and Sediment Damages
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Erosion and Sediment DamagesErosion and Sediment Damages
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ConclusionsConclusions
State/Local Partnerships Have Benefits
WIN - WIN For Everyone
Advanced Planning Is Valuable
Everyone Saves $$$
Maintenance is Reduced
Results in Significant Public Benefits