To complement and support our firm’s natural resources services, CRI has an established water resources department with a staff of highly qualified engineers and scientists to provide innovative solutions to stormwater control. We specialize in urban and watershed rainfall/runoff studies, stormwater management, erosion and sediment control, surface water hydrology and hydraulics, water quality investigations, watershed analyses, stream restoration, as well as a variety of hydrologic permitting services.
From stormwater runoff to erosion issues, CRI has the ability to provide our clients with a comprehensive drainage analysis and design. Whether the problem is soft spots in yards, eroded outfalls or problematic ponds, CRI can determine what the problem is and recommend a range of solutions to correct or mitigate the problem. CRI is committed to preserving, protecting, and enhancing water quality through innovative and practical water resource management strategies. From properly designing a stream crossing that prevents erosion or minimizing stormwater runoff for a site or roadway, we develop environmentally sensitive solutions for complex engineering and ecological challenges. By balancing function, aesthetics, constructability, and maintenance, we protect our valuable resources for future generations to enjoy. We provide the full range of services that can take a project from preliminary design through permitting and construction.
Stormwater Management (SWM)
CRI offers a comprehensive approach to stormwater management, addressing planning, design, engineering, and compliance at the facility level and for entire watersheds. Our staff has obtained stormwater permits for the State Highway Administration (SHA), Prince George’s County, Montgomery County, as well as other state and municipal agencies. Coastal Resources is experienced in managing and designing for large environmental stewardship and mitigation programs, which include urban stormwater retrofits. Projects include pond remediation, sand filter remediation, and new stormwater management facility planning.
Our staff has proven experience in the design and inspection of decentralized and non-point SWM including Environmental Site Design (ESD) and other Low-Impact Development (LID) techniques for both new and retrofit projects. We are qualified in the design of stormwater facilities specifically geared toward meeting TMDL goals such as bioretention facilities, bioswales, wet swales, and dry swales.
Given the dynamic environment of stormwater management compliance, CRI stays abreast of the most innovative Best Management Practices (BMP’s) along with agency standards and procedures. We develop and maintain good rapport with jurisdictional staff providing cost effective BMP design and inspection.
Highway and Urban Drainage Design
CRI is dedicated to providing cost effective drainage solutions, appropriate to specific site constraints. Our staff is experienced in the design of open channels, flexible channel linings, storm drain networks including hydraulic computations, flow splitters, risers, culverts and energy-dissipating devices. We also have experience in site design, drainage complaint investigation and drainage facility inspection.
Hydrology and Hydraulics (H&H)
The staff at CRI has expertise in modeling for wetland and waterway projects as well as stormwater projects. Our personnel have the training and hands-on experience with field data gathering and computer simulations required for surface water analyses and the design of hydraulic structures, ranging from small stormwater drainage systems to dam spillways. These include rainfall/runoff evaluation of specific flooding events, as well as continuous (time series) hydrograph simulations. Our engineers are well versed in evaluating steady as well as unsteady flow applications for open channel conditions.
CRI understands that building resiliency in the face of changing climate conditions is a critical issue for our federal, state and local clients. CRI’s technical expertise in H&H plays a key role in our ability to assist our clients in managing these challenges. Our staff has experience in modeling and evaluating floodplain limits and has performed H&H analysis to update floodplain mapping to current or proposed conditions for adoption as a regulated floodplain. We have also assisted local government clients in defining floodplains above the FEMA mapped floodplains using HEC-RAS 2D to aid in planning decisions for nuisance flooding areas.
In addition, our engineers and scientists have the practical experience and academic training to apply statistical methods to characterize stream flow in a watershed. Our abilities include water budget and inflow/outflow; analysis of stream gage data; confirmatory field measurement of stream flows and stream geometry transects; application of regional regression equations and synthetic flow duration methodologies.
We have experience with WinTR-55 and TR-20, HY-8, HDS 5, HEC-RAS 2D, GISHydro, FHWA Hydraulic Toolbox, HY-22 Visual Urban, FishXing, StreamStats, TVHG, SHARISER, SWM Processor and SWMM softwares.
Erosion and Sediment Control
CRI offers a wide range of erosion and sediment (E&S) control services from the initial planning stage to on-site inspection and training. All CRI engineers and inspectors are certified by both the Maryland Department of the Environment and the Maryland State Highway Administration in erosion and sediment control (Responsible Personnel and Yellow Card). We have obtained erosion and sediment control permits required for state, federal and municipal agencies. Our staff has wide-ranging experience in the design and permitting of E&S including highway (with multiple phases), stormwater ponds, stream restoration, wetland mitigation, site development, dam removal, and intersection improvement projects.
- Best Management Protocols / Stormwater Management On-Call Support Services
- Bioswales Monitoring for ICC (Contract PB-C)
- Floodplain Extension Mapping
- MD 4 Thomas Johnson Bridge Project Planning Study
- MD 5 at Abell/Moakley Street Intersection Stream Relocation Project
- Patapsco-Marley Creek Tidal Outfalls Feasibility Study
- TMDL SWM BMP Program Planning and Design
- US 50 Severn River Bridge Preliminary Investigations
- Wetland Mitigation Design, Great Seneca Creek Floodplain (ICC SC-19 Site)