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 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.

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. H&H Analysis used for:

How we can help: Pre-application meetings. Guidance on whether H&H will be required. Contacts:

WATERWAY CONSTRUCTION DIVISION CONTACTS BY COUNTY COUNTYPROJECT ENGINEERTELEPHONE ADDRESS Frederick County Washington County, East of I-81 Wuhib Allegany County Garrett County Washington County, West of I-81 Paul Prince Georges CountyImtiaz Carroll County Howard County Debra Harford County Cecil County Tamene Calvert County Charles County St. Marys County Mohammad Anne Arundel County Eastern Shore Kelly Montgomery CountyHira Baltimore City Baltimore County Phatta

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.