Stormwater Management

As the 100-year storm increases in regularity—and development increasingly impacts natural stormwater control measures—it is our responsibility as engineers to integrate sustainable designs into every project. In developed areas, impervious surfaces such as pavement and roofs, prevent water from naturally soaking into the ground where contaminants can be removed before entering surface or groundwater resources. In low-lying and flood prone areas, deteriorating and under-sized drainage structures can easily be overwhelmed, causing flooding and dangerous erosion around other critical infrastructure. Planning for and preventing these issues before they arise and quickly rehabilitating damaged systems is paramount. Our team believes in providing efficient and effective solutions tailored to your specific stormwater needs that keep environmental impact a top priority.

We offer a wide range of stormwater services including: 

  • Capital Improvements Projects

  • Storm Drainage Design (including coastal stormwater design)

  • Culvert Design 

  • Streambank stabilization

  • Stormwater control measures (including retention ponds, bioretention cells, & infiltration trenches)

  • Certified low impact development

Our Work in Your Communities

Granite Falls - N. Highland Ave Drainage Improvements

Approximately 36 acres were drained by an existing open ditch in a residential area. Residents in the area were subjected to frequent flooding and property damage during storm conditions. In order to stabilize the ditch and prevent flooding, the ditch was replaced with 1465 linear feet of 36-, 30- and 24-inch storm drainage pipe. Several catch basins were located at strategic points to collect immediate surface runoff. The drainage improvements provided an aesthetically pleasing solution and answered the safety concerns of area residents.

Greenville, NC - Green Mill Run Watershed

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The purpose of the project was to map a complete storm drainage system conveying public water within the Green Mill Run watershed located in Greenville, NC. The Wooten Company was a sub-consultant to Hazen and Sawyer, who performed the overall Stormwater Master Plan Initially the watershed had to be divided into subwatersheds using GIS analyses of LiDAR data. The project involved a scout up front to provide schematics of connectivity between storm water structures and open drainage systems within the map book. Field crews utilized the preliminary connectivity sketches to locate and collect pertinent information of individual structures. The process of field data collection for such a large project area was expedited through the usage GPS receivers operating on the NC Continuously Operating Reference Station (CORS) Network, allowing coordinates to be corrected on-the-fly. Areas of dense canopy and tall building structures had to be located conventionally with a total station. Based upon the attributes collected within the field, structures could be connected using GIS programming to allow for a network analysis and storm water modeling. Lastly, the large geodatabase of individual structures and its seamless connectivity within the Green Mill Run watershed were transferred to the modeling engineer where analyses were performed to determine areas of potential flooding.

Smithfield, NC - Stormwater Retention Pond

Winner of 1999 Honors Award for Water Resources from the American Council of Engineering Companies of North Carolina


The Stormwater Retention Pond project was designed based on N.C.'s BMP's for a watershed of approximately 343 acres. The design objective was to attenuate the discharge of stormwater to downstream structures to allow for utilization of the existing piping and channels without causing flooding. The basin was also designed to provide treatment of the stormwater prior to discharge. The retention pond, consistent with Neuse River Rules, has alleviated flooding downstream in a very urbanized creek channel. The overall project budget was $3.5 million, which included construction of the pond and significant upstream infrastructure to deliver runoff to the pond. Construction was completed in 1998.

Town of Tarboro - Sunset Avenue Road and Utilities Repairs

Emergency repairs lead to large-scale improvements and added resiliency

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During the aftermath and recovery of Hurricane Mathew in October 2016, the Town of Tarboro contacted The Wooten Company to assist the Town with the repair and replacement of a culvert drainage system located along Sunset Avenue in the Town of Tarboro.  Damage from the Hurricane destroyed the existing corrugated metal culvert, waterline, sidewalks, roadway and other drainage structures.  As part of the culvert analysis, it was determined that this particular culvert serviced a watershed of approximately 2,475 ac and was significantly undersized in its pre-hurricane form.  The Wooten Company then provided the design of a new, dual 7’x8’ reinforced box culvert system along with technical designs for the waterline, sidewalk, and roadway repairs.  The project was completed in 2017.

City of Washington - Jack’s Creek Storm Drainage Improvements

Regular flooding alleviated by careful floodwater management


The City of Washington, NC had suffered from extended flood conditions when the existing berm protecting the city was overtopped during storms.  The Jack's Creek Basin often remained flooded until the stormwater pump station could remove water from behind the berm.  The city desired a solution to allow water levels upstream of the berm to recede at the same rate as the river level following such storm events.  The Wooten Company worked with the city to design a solution and provide construction administration and observation for the development of four 9 foot by 6 foot reinforced concrete box culverts with flap gates under NC 32 to aid in pumping efforts and relieve major flooding upstream in Jack's Creek.  Additionally a 20 foot by 7 foot multi-cell reinforced concrete box culvert was added at a downstream road crossing in order to handle the additional flows from upstream.

City of Washington - Stormwater Management System and Waterfront Boardwalk

Improvements to the City’s stormwater system also deliver downtown Boardwalk

Winner of an ACEC/NC Engineering Excellence Grand Award for Water Resources

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The City of Washington undertook a project aimed at updating their stormwater management system and creating a wetlands/boardwalk area to function both as a filter for runoff and as a recreational asset for it’s citizens.  The Wooten Company served as the prime consultant and provided design, construction administration and construction observation for the project, which ACEC/NC awarded with their Grand Award for Water Resources.  There were three phases of improvements within the work performed.  The first included retrofitting the downtown stormwater system to capture a portion of the runoff before it entered the Pamlico River.  The second realigned Stewart Parkway along the riverfront in order to reduce impervious cover, and the third involved the construction of the wetlands and boardwalk.  A 36-inch through 60-inch diameter bypass piping system was designed to capture the first flush runoff from 73 acres of downtown area and deliver it to the constructed wetland to remove pollutants before discharging into the river.  The four acre wetland was designed per NC Best Management Practices and the 1900 foot elevated boardwalk through the wetland served as an extension of the riverfront park, connecting residential areas to the NC Estuarium and the central business district in Washington.  The project cost the city $1.457 million but received funding from a Clean Water Management Trust Fund grant.

City of Oxford - Goshen Street Stormwater Improvements

Recurring flooding of neighborhoods and intersections mitigated by improvements

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Due to flooding of large neighborhood ditches and road intersections, The Wooten Company performed an evaluation of approximately 1,750 LF of 12-inch through 48-inch stormwater piping, structures, and drainage ditch systems that convey runoff from a 66 acre multi-basin drainage area in Oxford, NC.  Evaluation included survey and inventory of storm drainage system, analysis of 2-year, 5-year, 10-year, and 25-year storms, and design of improvements based on 10-year and 25-year storms.  Hydraulic modeling software was utilized for analysis of existing and proposed conditions.  Existing topography and roadway elevations were also evaluated to determine their contribution to flooding issues.  Improvements include upsizing existing mains, parallel of existing mains, increase number of basins, and expansion, cleaning, and regular maintenance of ditches.