MS4/Stormwater Compliance: Floodplain maintenance of other gray infrastructure Restoration/Reconnection community assets that provide multiple benefits 4c1 including reduced flood risk, life cycle cost, improved resiliency and sustainability. Thomas Graupensperger, Dewberry The Upper Little Patuxent Stream Restoration: A Municipalities are charged with complying with TMDL Reduction Project the Municipal Separate Storm Sewer System (MS4) Permits and the six Minimum Control 4c2 Measures. Pollutant Reduction Plans and Total Maximum Daily Load (TMDL) reductions are now Andrew Birmingham, PE, Jeremy Koser, PE required under many watershed implementation Johnson, Mirmiran and Thompson plans. To meet the challenges, regulators have Maryland State Highway Administration’s identified Natural Stream Channel Design (NSCD) Environmental Programs Division (SHA-EPD) in restoration, floodplain and riparian reconnection conjunction with the Howard County Bureau of as a means of improving water quality to meet Environmental Services identified a portion of the watershed TMDLs, along with implementing Upper Little Patuxent River for stream restoration other Green Stormwater Infrastructure (GSI) in pursuit of TMDL credits to restore the opportunities. Chesapeake Bay. This was the first design-build contract awarded by the SHA for stream Pollutant Reduction Plan approaches include: restoration. Efforts included stream and Integrated-gray/green water resources floodplain restoration on over 4,300 feet of infrastructure improvements/opportunities mainstem and tributary to improve water quality while implementing GSI Stormwater Control and biological/ecological function while Measures and non-structural control measures maintaining sediment equilibrium through the to improve water quality, increase base flow range of storm events. A discussion of the design recharge and reduce nuisance flooding. and permitting efforts will include geomorphic Comprehensive watershed restoration measures and hydraulic analysis, restoration techniques, provide required floodprone area hydrologic preparation of design plans, and permitting modifications through natural channel coordination. Design constraints included utility restoration, floodplain/wetlands reconnection, and natural resource impacts, site access, riparian buffers, and reforestation. Step-pool maintenance of streamflow, and erosion and stormwater conveyance restoration and sediment control during construction. The bioengineering techniques stabilize and restore proposed design will serve to provide significant eroding, sediment producing, nutrient and sediment reductions, increase flood tributary/stormwater conveyances. attenuation, provide long-term stability, and restore hyporheic and floodplain connection. Examples of integrated gray infrastructure Construction was completed in Spring 2015. planning and natural/ecosystem restoration to be presented include: creation of open space floodplain/recreation and greenway areas, improved parklands/golf courses, replaced/maintained NSCD bridges and Miqoun Creek Restoration - Restoring Stream Function and Safety after Extreme Storm Damage 4c3

Brett Long, Biohabitats; Chris Streb, Biohabitats

Miquon Creek, a tributary to the Schuylkill River, flows through the Miquon School Property in Montgomery County, PA and has experienced significant erosion over the past decade. The stream is an integral part of the outdoor learning curriculum at Miquon School, and the degradation of the stream has led to safety concerns due to the high vertical banks. The stream channel has been degraded by recent extreme rainfall/runoff events, leading the channel to become severely entrenched which has limited floodwater storage and vegetative protection of the stream banks. The restoration aims to stabilize the stream banks/bed, develop habitats for aquatic/terrestrial plants, improve macroinvertebrate/fish habitat, improve sediment transport, and create a safe condition for education of Miquon School students. This will be achieved through a combination of techniques including bank grading, developing a step/pool system, and the restoration of a riparian buffer. In addition, the proposed restoration design will provide improved water quality through nutrient and sediment reductions that can be quantified using accepted and established removal rates for this type of restoration approach.