Drainage & Stormwater Management
Water Resources

Drainage & Stormwater Management

Our water resources engineers have accumulated many years of experience in drainage investigations, drainage design, stormwater management design, Best Management Practices (BMP) assessments and improvements and design to achieve Total Maximum Daily Load (TMDL) goals. We are thoroughly familiar with stormwater management regulations in the regions we serve. RJM provided the stormwater management design for the first project to receive approval from the Maryland Department of Environment’s new far-reaching regulations in 2010.


Intercounty Connector, Maryland State Highway Administration


Drainage structure near US 40 and MD 175

Featured Work

Drainage & Stormwater Management Projects

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    Drainage and Stormwater Management Design, Statewide

    Maryland State Highway Administration

    RJM Engineering has a long history of providing water resources engineering services as a sub-consultant on many Maryland State Highway Administration projects. Types of projects have included new roadways, roadway widenings, safety improvements, intersection improvements, bridge replacements, culvert replacements, ADA/sidewalk/trail improvements, and noise walls. RJM’s design efforts have been in all project phases from planning to P.I., Semi-Final, Final, PS&E and construction phase services.

    Services typically provided by RJM have included hydrologic studies, stormwater analysis and concepts, and flood plain studies. Designs have been provided for drainage, stormwater management and erosion/sediment control. RJM’ engineering staff is fully experienced with the latest MDE regulations and SHA directives, and remains current with Maryland erosion/sediment control certifications.

    More recently, RJM has provided design services for water quality mitigation for TMDL (Total Daily Maximum Load) at numerous sites throughout Maryland. Many of these projects have been completed in three phases: Exploratory, Concept and Final Design. Exploratory efforts have included assembling existing data, determining potential ESD/BMP locations, field investigations, verifying existing drainage patterns and identifying potential environmental impacts and utility conflicts. Concept efforts have included developing concept stormwater management reports and coordination with SHA and MDE. Design efforts have included all semi-final and final design plans, specifications, cost estimates, reports, addressing SHA and MDE comments, and complete PS&E submittals.


    Services Provided

    • Hydrologic/hydraulic studies
    • Flood plain analysis
    • Drainage design
    • Stormwater management
    • Erosion/sediment control

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    Drainage, Stormwater Management, and Erosion & Sediment Control Design for Purple Line

    Maryland Transit Administration

    The Purple Line is a proposed 16-mile light rail transit line project that will provide better connections to the Washington, DC Metrorail services and foster more reliable east-west transit service. The Purple Line will extend between Bethesda in Montgomery County and New Carrollton in Prince George’s County with major activity centers located between those termini (Bethesda, Silver Spring, Takoma/Langley Park, College Park, and New Carrollton) which are dense areas of residential or employment uses.

    As part of the General Engineering Consultant (GEC) team for Maryland’s Purple Line, RJM is currently providing water resources engineering services for a two-mile section of the proposed transit line along CSX corridor in Silver Spring, as well as a train storage and maintenance yard in Glenridge. RJM’s contributions to the design effort have included the following:

    • Assembly of existing storm drain information for the assigned areas based on aerial survey information, as-built plans, GIS data, and field investigation
    • SWM analysis and design, and drainage design
    • Erosion and sediment control design
    • Hydrologic and hydraulic reports for two major stream crossings along the transit way for bridge design purposes

    RJM staff engineers have been an integral part of the water resources engineering team, and have contributed to coordination, quality control, and inter-disciplinary reviews.


    Services Provided

    • Stormwater management analysis and design
    • Erosion/sediment control
    • Hydrologic/hydraulic reports for stream crossings

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    Lexington Streetscape Improvements

    City of Baltimore Department of Transportation

    The purpose of this project was to open the Lexington Mall to vehicular traffic including streetscape improvements from Liberty Street to Park Avenue to address both pedestrian and vehicular activity. As a sub-consultant, RJM provided utility and stormwater management design services. Our scope of services included the abandonment of and/or removal of the existing water main and appurtenances, and preparation of design documents for a new 10” water main to accommodate the proposed improvements to Lexington Street, including plans, profiles, details, specifications and construction cost estimates. Construction administration services for the design elements are also provided.

    RJM added new storm drain inlets as required to meet City standards, provided storm drain back-up computations and prepared construction documents for stormwater management plans to address both quantity and quality as required to meet both MDE and City standards.

    In addition, RJM reviewed utility systems for impacts caused by the construction including water, storm drainage, sanitary sewer, electric, telephone, gas and steam, identified the existing utility surface features requiring adjustment, and added new water service connections and hydrants.


    Services Provided

    • Design for utilities and storm drains