Flood Recovery- By the Num6er5

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Brian Graham, AICP Transportation  Department

description

A By the Numbers account of flood debris removal, high hazard mitigation and emergency protective measures taken after the historic floods in Boulder County. Variations of this presentation was shared with the Boulder County Commissioners and Planning Commission, and will be shared at the 2014 Colorado APA Conference.

Transcript of Flood Recovery- By the Num6er5

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Brian Graham, AICPTransportation Department

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Roadside Debris Collection

High Hazard Mitigation

NRCS Emergency Protection

By the Num6er5

This presentation includes results from three flood recovery programs.

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Roadside DebrisCollection

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Boulder County managed debris collection for Jamestown and Lyons, but stats in presentation are for unincorporated ROW only.

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Truckloads

From November 2013 through June 2014 we collected approximately 3,000 truckloads of flood debris from our roadside collection program.

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And by truckload, we mean really big truckload.

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0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

Dec Jan Feb Mar Apr May June

Tons of D

ebris

Debris Types ‐ Unincorporated Right of Way

Veg Sed C&D

Sediment

C&D/ Trash

Vegetative

Most materials collected were sediment, Construction & Demolition (trash) & vegetative debris.

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Pounds

We also collected over 16K pounds of Electronic Waste (E‐waste), Household Hazardous Waste (HHW), Tires and White Goods… 

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Refrigerators, washing machines, etc. are commonly referred to as white goods.

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Tons

From the roadside debris collection program we collected over 25 tons of material.

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Pounds

Converted to pounds‐‐ we collected over 50 million pounds of flood debris from our roadsides.

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High HazardMitigation

High Hazard Mitigation refers largely to debris removal from creeks

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Our creeks and culverts were filled with debris, causing a threat of additional flooding during spring runoff.  Here, Tim Zych from our Parks and Open Space Department is dwarfed by a 

woody debris pile in the Little Thompson Creek in northern Boulder County.

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Many homes were also destroyed by the flood.  (Riverside Dr./ Middle St. Vrain Creek)

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(Apple Valley Rd./ North St. Vrain Creek)

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Houses9 houses were removed through FEMA and NRCS programs that were either in the creek 

or nearly falling in.

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Truckloads

Over 43K tons of debris were removed from our creeks via approximately 3,000 truckloads, not including debris removal conducted by local fire districts on our behalf through a 

grant program and IGAs.

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Woody debris pile blocking a culvert near the 6 mile marker of Left Hand Creek.

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Culverts shown after debris removal restored conveyance.

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Signed ROEsOur high hazard mitigation work was unique because it required permission from private property owners to conduct work.  While over 900 property owners signed Right of Entry 

documents, the precise number of properties high hazard threats were mitigated is unknown.

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GoalOur goal was to complete our high hazard work by May 1st, reducing the threat of additional 

flooding brought on by spring runoff.

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Complete

As compared to the total volume of material removed at project completion, 77% was removed by May 1st.

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0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

March April May June

Tons of D

ebris

Debris Removal – By Creek

Fourmile James Left Hand Little T North St. Vrain St. Vrain

Left Hand Creek

A the bulk of our work occurred in Left Hand Creek, with significant work in James Creek, the St. Vrain Creek on POS property and also the Little Thompson Creek, which mostly happened after May 1st.  We 

deemphasized Little Thompson Creek because it presented less of a spring runoff threat. 

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Complete

Excluding Little Thompson Creek, over 90% of work was completed by May 1st.

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Pages

Following the requirements for FEMA reimbursement requires a lot of documentation. This is the number of pages in our most recent Leidos debris monitoring invoice.

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Emergency Watershed Protection

The Natural Resource Conservation Services’ Emergency Watershed Protection Program intent, applicable to Boulder County projects, was to stabilize creek banks, preventing further damage 

to private homes.

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PropertiesWe’ve completed (or nearly completed) 10 EWP projects, directly mitigating the risks to 

54 properties.

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StreamcrestApple Valley

Wallstreet/ SalinaRaymond/ Riverside

Longmont Dam RoadThe five main areas of work (above) , consisting largely of bank stabilization, or in the case of 

Streamcrest‐ creek realignment.

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NRCS funded work in‐progress along Longmont Dam Road/ North St. Vrain Creek.

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Bank stabilization work on upper Left Hand Creek.

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The view from Streamcrest as debris removal work was getting started.

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Streamcrest near completion: a new channel had been cut, with a flood bench to accommodate a 25‐yr storm.

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Demonstrating the depth of sediment deposited in Streamcrest… the top of the camper shell was barely visible at the commencement of the project.

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All of the excavated material was temporarily staged on the back side of the Greenbriar Inn’s property.  I called this Mount Streamcrest.

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Truckloads

In total, about 1,800 truckloads of this sediment was hauled from Streamcrest to the West Pond at Kenosha Open Space property to help fulfill obligations of a pending water rights decision.

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A photo from Kenosha Open Space of the partially filled West Pond.

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SavingsThe collaboration with Parks and Open space on the disposal of this flood debris saved the 

county over one‐half million dollars!

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Thanks to our work, we made a lot of fans.  Our construction manager on the Streamcrest and Riverside NRCS projects was delivered cookies every week. 

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Truckloads

In cleaning up our roadsides and creeks we hauled away almost 8,000 truckloads of debris.

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This aerial photo of our Debris Management Site (DMS) near 28th and Jay Road represents about 8% of the total amount of material collected, by weight.

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The DMS was a staging yard for woody debris.  To meet our object of keeping material out of landfills, & to comply with the Emerald Ash Borer quarantine, woody debris was ground‐up here.

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Cubic Yards

In total, nearly 50K CY of collected material is in the process of being ground‐up and will be composted or otherwise put to a higher use.

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117 Boulder County residents took advantage of a July Mulch Give‐Away hosted by Resource Conservation.

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DivertedAs compared to the weight of material we removed in total, 42% was kept out of a landfill.  This included sediment that was repurposed, woody debris that is being ground and composted 

and HHW and E‐waste that was recycled.

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Assessments/ ScopingProject Management

Purchasing/ ContractingPublic Relations

Engineering/ PermittingDebris Removal

FEMA MonitoringNRCS ConstructionConstruction Mgmt.

Close-out/ ReimbursementThese projects were a massive undertaking, from scoping the work to be completed through surveys and assessments all the way through closing out projects and seeking reimbursement.  

This work was not inexpensive…

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ExpendituresTo close‐out these projects we will have spent over $10M on project consultants and 

engineering, construction management and monitoring, contracts (including materials and equipment), tipping fees, and payroll, etc. 

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By the Num6er5

THANK  YOUBrian Graham, AICP

Transportation Department720‐564‐2667

[email protected]