presentation - navigation maintenance and dredging

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Waterway Management:Navigation Maintenance and Dredging

Waterways Steering Committee

February 15, 2011

Why do we dredge?

What it does do…Improve and maintain navigationImprove drainage

o What it doesn’t do.. o Reduce flooding

(flood surge levels doesn’t change)

Slide 2February 15, 2011 Dredging and Navigation

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Nature of Dredging Costs

Federal funds maintain federally designated channels (e.g Hampton Waterfront) Essential for maintenance of existing navigation channelsDiscretionary for new non-federal projectsNew projects create “maintenance tail”

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Currently funded from City’s Capital BudgetCosts are borne by all citizens, benefits limited to a smaller group.

February 15, 2010 Dredging and Navigation

Benefits and Costs

BenefitsEnhanced navigation & recreationgMaintenance of waterfront residential tax baseEnhanced economic activity

Costs2010/2011 estimated cost of dredging: $1.48M. Anticipate averaging $500K per year in the

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averaging $500K per year in the next 10 years.Environmental impactsOpportunity costs for other projects not funded


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Municipal Project Dredging Beneficiaries

Transient boatersValue of purchases

Resident boatersBoat supplies and slips but no boat tax

Waterfront Property OwnersNa igation benefits

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Navigation benefitsIncreased property value


Waterfront Tax Base

3.8+% of the total number of singlenumber of single family residential units (1470 units)7.5+% of assessed value of single family residential ($568M) and tax receipts

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and tax receipts ($5.91M)


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SUNSET CREEK

Slide 7July 14, 2010 Waterway Management

Profile of Municipal Dredging

1. Salt Ponds Inlet. Small boat entrance channel. Dredged annually Average cost: $300 000Dredged annually. Average cost: $300,000

2. Gosnold Hope Park – small boat navigation channel with ramp. Last dredged: 2008 $ 200,000

3. Back River Channel – small boat navigation. Last dredged: 2010, $ 800,000

4. Hampton River (Upper Reaches) – small boat $

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navigation. Currently underway, $ 872,000.


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Waterways Not Recently Dredged

5 Indian River5. Indian River6. Mill Creek7. Harris Creek8. SW Branch,

Back River9. Long Creek

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g10. Dandy Point** State project


Major Waterway Dredging Cost

Status of Dredging of Major Waterways

Project Previously Dredged Future Schedule Prev. Cost Future Cost (2010)

Hampton River 2010 FY2030 $872K $2.2M

Gosnold’s Hope Park Ramp Channel 1986 and 2008 FY 2032 $200K $200Kp p $ $

Indian Creek Not Dredged FY2013? $2.1M

FY2035 $2.1M

Mill Creek Not Dredged Not Scheduled

Long Creek 1957 Not Scheduled Not known

Harris Creek Not Dredged Not Scheduled .

S.W. Branch Back River Not Dredged Not scheduled

Salt Ponds Channel Ent. 2005 $200K

2006 $350K

2008 $118K

2009 $350K

FY2011‐14 $350K/YR.

Harris Creek Not scheduled


Harris Creek Not scheduled

Wallace Creek Not scheduled

Back River 2010 FY 2020 $800K $800K

Salt Ponds Channel 1980 Not available

FY2011 proposed Not available $250K

Sunset Creek Not known Not scheduled Not known

Dandy Point Channel 1980’s State project Not Available Not known

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Hampton River

4.26 miles of navigationnavigation channels for motor craftMain stem and ancillaries489 single family

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489 single family waterfront residences


Gosnold Hope Park Channel

2,700+ long small b t h l fboat channel for motor craftServes city boat ramp and Riverpoint canal residents

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residents Last dredged 2008

July 14, 2010 Waterway Management

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Salt Ponds

Entrance channel and basin83 single family waterfront property ownersMajor marina complexSailing center for Ches BayFrequent maintenance

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Frequent maintenance dredging required at entrance


Back River

Primarily an access channel serves several marinasLast dredged in 2010


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Long Creek/Grundland Creek

2.9+ mile small boat channelchannelServes Grandview neighborhood99 single f il

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family waterfront owners


Harris Creek

2.1 mile waterwayyNo formal channel in head


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Wallace Creek

Small boat channelServes Dandy Point and Belle Isle marina

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areas


Sunset Creek

3,000 ft channel and canalServes marinas and commercial traffic


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Indian Creek

No access to Hampton RoadsHampton RoadsPrimarily a stormwater control and drainage feature


Permits and Regulatory Agencies


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Regulatory Policies Governing Dredging

Policy Restrictions:Dredging in mudflats highly discouragedDredging for drainage maintenance li it dlimited Channel widths and depths limited to minimum necessary for intended useDredging of tidal wetlands not generally approved“4X buffer” rule of offset from wetlandsImportant marine resources (submerged aquatic vegetation and shellfish beds)

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q g )must be avoided“Double handling” of material discouragedLimitations of where dredge material can be placed

February 15 , 2011 Dredging and Navigation

Community Issues

How should we view our waterways?public highways & economic engines, or natural features to be improved at privatenatural features to be improved at private expense

Who pays..who benefits? greater community benefit, orlimited benefits focused on a few? How can we align beneficiaries with cost?

Where should dredging be in community priorities?

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Are there new projects which create community benefits?How can the City limit dredging costs?How can we create long term stable funding for navigation maintenance projects?


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presentation - navigation maintenance and dredging

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