H-HMarch2013 - Maryland Department of the Environment

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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.

COMAR 26.17.04
Construction on Nontidal Waters and Floodplains
H&H 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.

H&H 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.

H&H 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.

How we can help:

Pre-application meetings.

Guidance on whether H&H will be
required.

Contacts:
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
[email protected]
Allegany County
Garrett County
Washington County, West of I-81
Paul Busam
410-537-3213
[email protected]
Prince Georges County
Imtiaz Choudhry
410-537-3813
[email protected]
Carroll County
Howard County
Debra Correia
410-537-3900
[email protected]
Harford County
Cecil County
Tamene Dilnesahu
410-537-3803
[email protected]
Calvert County
Charles County
St. Mary’s County
Mohammad Ebrahimi
410-537-3816
[email protected]
Anne Arundel County
Eastern Shore
Kelly Flint
410-537-3536
[email protected]
Montgomery County
Hira Shrestha
410-537-4247
[email protected]
Baltimore City
Baltimore County
Phatta Thapa
410-537-3641
[email protected]
How you can help:

Plan on providing H&H (money and time).

Provide all data: input, output, summary tables.

Provide an engineering narrative with
assumptions used and conclusions reached.
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