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Lake Como Dam Status Update: Flood Risks and Infrastructure Resilience

The South Monmouth Regional Sewerage Authority (SMRSA) provides an update on Lake Como, classified as a Class III low-hazard dam by NJDEP. Owned by Belmar, Spring Lake, and Monmouth County, this 30-acre lake faces significant challenges from historical flooding exacerbated by coastal storm surges, particularly from Super Storm Sandy. The effects on SMRSA include damaged pump stations and significant monetary losses. Moving forward, emergency measures are in place to protect infrastructure and residents, with ongoing discussions regarding ownership, resilience, and funding.

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Lake Como Dam Status Update: Flood Risks and Infrastructure Resilience

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  1. Lake Como Status UpdateSouth Monmouth Regional Sewerage Authority (SMRSA) Michael J. Ruppel, Exec. Dir.

  2. Lake Como Considered Class III (Low Hazard) Dam by NJDEP Owned by Belmar, Spring Lake & Monmouth County • Lake is owned by three separate Boroughs. ( 30 Acres)

  3. Historical Flooding • Watershed Driven (rainfall events) • Coastal Storm Surge (Super Storm Sandy) Outlet plugged Influent kept comingbut had nowhere to go

  4. Hydraulics/Hydrology (the science) Peak Inflow 2 yr = 1145 cfs (3 in) 10 yr = 2186 cfs (5.4 in) 25 yr = 2873 cfs (6.7 in) 100 yr = 4191 cfs (9.2 in) "One-hundred-year storm" means the storm which is estimated to have a one percent chance, or one chance in 100, of being equaled or exceeded in one year.

  5. (the science) cont’d

  6. (the science) cont’d Tidal Influence Pond storage capable of handling a 10 yr storm event (5.4 in) Peak Outflow approx. 40 cfs (when submerged)

  7. Lake Como’s Effect on SMRSA • Twopump stations devastated (Lake Como & Pitney Ave) • Loss of Service for seven days • $ 2.88 million in damages (Sandy) • $ .963 million in damages over past seven years (LC PS) • and….. Potential flooding of WWTP which issurrounded by major contributory to Lake Como.

  8. Add Sea Level Rise Does not include other effects of Climate Change i.e.( increased rainfall intensities, etc.)

  9. Temp Emergency Measures • 80 MGD pump system(123.79 cfs) since removed • Temp PVC outfall line (40 cfs) • Four 18” DIP pump discharge lines installed beneath Ocean Ave

  10. Moving ForwardProtecting Infrastructure/Residents • SMRSA – Lake Como PS Relocation Pitney Ave PS Mobile Enclosure • “Lake Como” – Issues - Stakeholders/Ownership? - Regulatory? - Level of resiliency? - Funding? - Temp. Planning/ Future Schedule?

  11. Questions? Michael J. Ruppel exdir@smrsa.org www.smrsa.org

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