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Designing for Climate Change – Flood Risk Mitigation Using Optimization (Alexandria VA)

The City of Alexandria, VA, has experienced repeated and increasingly frequent flooding. The increased storm related flooding is attributable to old infrastructure, inconsistent design criteria, and climate change. The objectives of the study were to (1) update stormwater collection system modeling and improve understanding of flood extents, (2) use optimization to evaluate alternatives and maximize […]


Hydrologic and Hydraulic Modeling of the Hare Snipe Creek Watershed

The Hare Snipe Creek watershed is a 7.2 square mile watershed located in northwestern Raleigh, North Carolina. The watershed is nearly fully developed and undergoing redevelopment, and experiences regular flooding events that negatively impact residents. Brown and Caldwell developed an integrated watershed study for the City of Raleigh to help identify and evaluate potential flood […]


1D-2D SWMM Calibration Case Study: Stoney Run Drainage Study

August 15th, 2020 was a memorable day for residents of the Colony Pines and Windsor Great Park Neighborhoods as stormwater overtook streets, yards, and residential structures, compounded by overtopping of storage basins and their accompanying floodwalls. These communities are located in the Stoney Run watershed, characterized as an urban residential region after being developed largely […]


Lessons Learned from Integrating 1D and 2D Riverine and Collection System Models

Many communities in Virginia and across the country suffer from routine and often severe flooding due to a combination of riverine impacts and old, undersized stormwater collection systems. But how many communities have the opportunity to developed detailed hydrologic and hydraulic models of both systems on a watershed scale? The City of Fayetteville NC had […]


Rainfall Analysis – Current Trends

Flooding in coastal areas can occur as a result of several factors, including low-lying areas, land subsidence causing adverse slopes in storm sewer pipes, high groundwater, inadequate hydraulic carrying capacity, and the age of the stormwater system, which may have been laid in the ground before current design standards were implemented. In recent years, another […]


Interior Drainage Hydrology & Hydraulics for the Design of a Federal Flood Risk Management Project in Downtown Norfolk

The U.S. Army Corps of Engineers (USACE) in cooperation with the City of Norfolk intends to build a coastal storm risk management project along the City’s Eastern Branch of Elizabeth River shoreline. This project along with other City’s flood mitigation projects such as the St. Paul’s Blue/Greenway transformation project could potentially impact the interior drainage […]


Lessons Learned From Developing A Master Stormwater Model

To understand how a stormwater drainage system functions, calculations and analysis must be performed.  This analysis and calculations can be performed via a large number of methodologies.  Over the last 7 years, using PCSWMM, the City of Virginia Beach has developed a SWMM model of its Primary Stormwater Management System (PSMS). Each portion of developing […]


Bridge Scour: What to Consider

The most common cause of bridge failures over streams is from floods scouring bed material around bridge foundations. Scour is the engineering term for the erosion caused by water of the soil surrounding a bridge foundation (piers and abutments). Bridge scour evaluation requires multidisciplinary inputs. This presentation will focus on the formation of bridge scour, […]


Brooke Road – A 2-D Flood & Mitigation Analysis of a Roadway Within a Floodplain

Brooke Road, a rural arterial road in the floodplain fringe of Accokeek Creek experiences frequent flooding which causes traffic disruptions, inconvenience, and hinders emergency access to the adjacent neighborhoods. This road lies at the base of a series of steep slopes and runs in parallel with the floodplain.   In order to understand the causation of […]