Swamp Creek: Culvert Replacements Sokaogon Chippewa Community Roman Ferdinand Tribal Water Workshop – Mille Lacs October 9, 2014
Swamp Creek: Culvert Replacements October, 2014 Project Locations Problem Statement and Confirmation Design Permits Construction Side Note
Project Location:
Project Location: Swamp Creek – Class II Trout Stream, ERW and ORW; ONRW Wolf River – Class II Trout Stream, ORW, NWSR
Rice Lake:
Stream Crossings:
How it fits: ASSESSMENT RESTORATION PROTECTION
Problem Statement: Perched culverts Backwater issues (temperature, inhibited groundwater discharge, siltation, erosion, etc.) Fish habitat modifications (spawning, passage, etc.)
Problem Confirmation: Topographic survey (stream, floodplain, stream crossings) HEC-RAS modeling (http://www.hec.usace.army.mil/software/hec-ras/) Contracted to Inter-Fluve, Inc. (http://www.interfluve.com/ ) Length – 6 miles, simulate 3 crossings Cost: $25,000 Funding: WTCAC (Small Projects grant)
HEC-RAS: USACE Channel geometry Flow and stage data Calibrate the model to real observations Predictive scenarios
Design: Site specific topographic survey Soil testing (bearing capacity) Three design alternatives with cost estimates Preferred alternative – detailed design and material/construction cost estimate Construction bid package, proposal review and contractor recommendation Cost: $32,000 (up to $62,000) Funding: EPA CWA 319
Preliminary Estimated Cost ($) Delivery Lead Time (weeks) http://www.conteches.com/ Opening Width Material Type Preliminary Estimated Cost ($) Delivery Lead Time (weeks) Materials* Installation Total 20' Clearspan Aluminum Box $ 40,600.00 $ 69,020.00 $ 109,620.00 4 - 5 Concrete Box $ 76,700.00 $ 130,390.00 $ 207,090.00 6 - 8 30' Clearspan Truss Bridge $ 70,000.00 $ 161,000.00 $ 231,000.00 10 - 12 $ 80,700.00 $ 137,190.00 $ 217,890.00 $ 91,300.00 $ 155,210.00 $ 246,510.00
Permits: State of Wisconsin U.S. Army Corps of Engineers Combined Waterway Protection General Permit 3500-053 Work within the existing stream crossing footprint – no wetland delineation needed. Review process: 30 – 60 days
Construction: Preferred construction inspection by design engineer Billed on time/expenses not to exceed Cost: Materials/Installation $110, 000 - $250,000 per site Inspection $ 27,000 (up to $ 41,000) estimate of 1 week per site Funding: GLRI (through BIA) EPA CWA 319 FWS National Fish Passage Program Private
Precipitation Frequency Finally – Side Note! Precipitation Frequency 2 year 24 hrs 100 years 24 hrs…….
Precipitation Frequency Used in engineering design: Flood events (steam crossings) Stormwater runoff storage (detention or seepage ponds) SCC – 24 hour 100 years storm event – 6.5 inches
NOAA Atlas 14 (2013) http://hdsc.nws.noaa.gov/
Thank you for your attention! Have a safe trip home!