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.