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About a decade ago, Timmons Group was contacted to help address localized flooding issues on the historic Virginia State University campus. Careful consideration by the University’s Capital Outlay and Facilities Management Department resulted in selection of a professional engineering services organization with a keen understanding of the state’s changing stormwater regulations and preference for sustainable […]
Many communities across the U.S. suffer from routine and severe flooding due to a combination of riverine impacts and old, undersized stormwater collection systems, especially in urban areas. But how many communities develop detailed hydrologic and hydraulic models of both systems on a watershed scale and use these models to transform their downtown with holistic […]
NOT CAVING UNDER PRESSURE: An EMERGENCY CEMETERY STORMDRAIN REPLACEMENT Michael Hogan,1 PE, RK&K Gabriela Larus,2 PE, RK&K; Bill Boston, City of Richmond DPU Land subsidence at several graves within the Oakwood Cemetery in the City of Richmond prompted an urgent response from the City’s Department of Public Utilities. RK&K was given this emergency task to […]
MS4 audits often present local municipalities with a lot of questions. The goal of this presentation is to provide the audience with an understanding of what to expect before, during, and after one of these audits. GKY has recently had the opportunity to provide support to three Northern Virginia municipalities during their recent DEQ MS4 […]
Coagulants are very effective for treating stormwater runoff and commonly achieve removal efficiencies of 80-90 percent for total phosphorus (TP), 35-65 percent for total nitrogen, 90+ percent for total suspended solids (TSS) and 90+ percent for pathogens. These efficiencies are higher than traditional stormwater treatment approaches. Enhanced treatment also requires much less land per watershed […]
The Sterns Creek, a tributary to the Western Branch Elizabeth River in Virginia, and its watershed with a drainage area of 2,350 acres covers 1,360 acres in the City of Chesapeake and 990 acres in the City of Portsmouth. The watershed in both the cities with residential and commercial properties suffers from recurring nuisance or […]
The amount of impervious cover in residential neighborhoods tends to gradually increase over time. Property improvements on individual parcels, such as detached garages, storage sheds, and extended driveways can significantly increase the imperviousness of individual parcels. However, the associated land disturbance associated with individual property improvements often falls below the minimum threshold size to require […]
The City of Virginia Beach identified the need to refine the existing HEC-HMS/RAS model for Stumpy Lake Dam to evaluate future dam and spillway improvements per the DCR conditional operations and maintenance certificate. Lying within a 10 square mile, highly urbanized drainage area, Stumpy Lake Dam is classified as a Significant Hazard Potential Dam. Significant […]
This is an update on the City of Virginia Beach Lake Bradford/Chubb Lake drainage improvement program, a follow up from last year’s “Weir Here to Fix your Flooding!” presentation. This is a multi-phase program to mitigate widespread flooding caused by moderate to heavy rainfall and tidal events. The Little Creek Basin, located in the City […]
The Virginia Pollutant Discharge Elimination System (VPDES) permit program may be best known by attendees for as the regulatory framework for the municipal separate storm sewer system (MS4) permit program but localities sometimes find themselves regulated under one of the VPDES industrial general permit program for stormwater discharges associated with certain regulated industrial activities. The […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
