Maryland Department of the Environment

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Maryland Department of the Environment Water
Management Administration Wetlands and Waterways
Program
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Hydrologic Hydraulic Analysis

• Hydrology amount of water, minimum 2-, 10- and
  100-year storms. (ultimate development).
• Hydraulics how the water moves. Compare
  existing to proposed conditions.
• Methods used must be in the public domain and
  verifiable.

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COMAR 26.17.04Construction on Nontidal Waters
and Floodplains

• HH analysis required for changes to the course,
  current or cross-section of waters of the State
  (unless waived).
• Waters of the State includes the 100-year
  floodplain for all regulated streams.
• Stream restorations analysis needed for proper
  design.

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HH Analysis used for

• Increased risk of flooding to others from any
  analyzed storm (.10).
• Any area, not owned by the applicant, subjected
  to flooding increases must be purchased, placed
  in a designated flood easement, or addressed by
  other means.
• other means is typically affected property
  owner sign off.

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HH Analysis used for

• Assure stability through sheer stress comparison
  of the project reach and immediately U/S and D/S
  (10).
• Withstand flood forces.
• Changes to mapped FEMA floodplain.

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How we can help

• Pre-application meetings.
• Guidance on whether HH will be required.
• Contacts

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WATERWAY CONSTRUCTION DIVISION CONTACTS BY COUNTY WATERWAY CONSTRUCTION DIVISION CONTACTS BY COUNTY WATERWAY CONSTRUCTION DIVISION CONTACTS BY COUNTY WATERWAY CONSTRUCTION DIVISION CONTACTS BY COUNTY
COUNTY PROJECT ENGINEER TELEPHONE EMAIL ADDRESS
Frederick County Washington County, East of I-81 Wuhib Bayou 410-537-3605 wbayou_at_mde.state.md.us
Allegany County Garrett County Washington County, West of I-81 Paul Busam 410-537-3213 pbusam_at_mde.state.md.us
Prince Georges County Imtiaz Choudhry 410-537-3813 ichoudhry_at_mde.state.md.us
Carroll County Howard County Debra Correia 410-537-3900 dcorreia_at_mde.state.md.us
Harford County Cecil County Tamene Dilnesahu 410-537-3803 tdilnesahu_at_mde.state.md.us
Calvert County Charles County St. Marys County Mohammad Ebrahimi 410-537-3816 mebrahimi_at_mde.state.md.us
Anne Arundel County Eastern Shore Kelly Flint 410-537-3536 kflint_at_mde.state.md.us
Montgomery County Hira Shrestha 410-537-4247 hshrestha_at_mde.state.md.us
Baltimore City Baltimore County Phatta Thapa 410-537-3641 pthapa_at_mde.state.md.us
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How you can help

• Plan on providing HH (money and time).
• Provide all data input, output, summary tables.
• Provide an engineering narrative with assumptions
  used and conclusions reached.

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