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Budget Year / Version:  
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Description

This flood mitigation project, located along Glenhaven Drive and Dennis Avenue in Wheaton, will excavate and expand the stream channel upstream of the Wheaton Regional Pond and modify the pond's riser structure. This project will be constructed in parallel with the Department of Transportation's (DOT) Dennis Avenue bridge replacement. The two projects will modify the current 100-year floodplain boundary just upstream of the pond. The post-project 100-year floodplain will not include the residential properties located in the current 100-year floodplain.
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Phase

Planning Stage

Status

Active
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Budget Snapshot
$5.53M Total
Expenditures/Funding
$4.9M 6 Year Total
Expenditures/Funding
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Location

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Estimated Schedule

The riser modification and channel design began in FY18 with the riser repair construction expected to start in FY22. The excavation of the channel will occur in coordination with DOT's culvert replacement in FY23 and FY24.
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Cost Change

Faster than expected design resulted in acceleration of the design phase, though redesign in the Dennis Avenue Bridge Replacement project (P501701) will delay construction to FY22.
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Justification

An engineering analysis by the Department of Environmental Protection indicates that the effect of the riser structure associated with the Wheaton Regional Pond, the Dennis Avenue Culvert, and an undersized stream channel along Glenhaven Drive, cumulatively, will cause flooding of roads and private property during a 100-year storm event. Flooding of adjacent roads and private property has already occurred in 2006 and 2010. The County is seeking a map revision to the Federal Emergency Management Agency (FEMA) panel for this area to have the 100-year floodplain updated to reflect existing conditions.
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Fiscal Note

This project will be done in conjunction with the DOT Dennis Avenue bridge replacement project (P501701). The County will also partner with the Maryland Emergency Management Agency (MEMA) to seek FEMA Pre-Disaster Mitigation Grant Program funding for the channel modifications.
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Coordination

Department of Transportation, Federal Emergency Management Agency, Maryland Emergency Management Agency, and Dennis Ave Bridge M-0194 Replacement (No. 501701).
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Budget Snapshot
$5.53M Total
Expenditures/Funding
$4.9M 6 Year Total
Expenditures/Funding
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Project Details
Project NumberP801710
Date Last Modified01/08/20
Administering AgencyEnvironmental Protection
CategoryConservation of Natural Resources
SubCategoryStormwater Management
Planning AreaKensington-Wheaton
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Total Expenditures by Cost Element (000s)
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Total Funding by Source (000s)
EXPENDITURES (000s)
Cost ElementsTotalThru FY19Est FY20Total 6 YearsFY 21FY 22FY 23FY 24FY 25FY 26Beyond 6 Years
Planning, Design and Supervision1030187443400170160700000
Land00000000000
Site Improvements and Utilities00000000000
Construction4500004500036009000000
Other00000000000
Total Expenditures5530187443490017037609700000
FUNDING (000s)
Funding SourceTotalThru FY19Est FY20Total 6 YearsFY 21FY 22FY 23FY 24FY 25FY 26Beyond 6 Years
Current Revenue: Water Quality Protection2530187443190017010906400000
Federal Aid3000003000026703300000
Long-Term Financing00000000000
Water Quality Protection Bonds00000000000
Total Funding Sources5530187443490017037609700000
APPROPRIATION AND EXPENDITURE DATA ($000s)
Appropriation FY 21 Request0
Year First AppropriationFY16
Appropriation FY 22 Request2580
Last FY's Cost Estimate5530
Cumulative Appropriation2950
Expenditure / Encumbrances622
Unencumbered Balance2328