New Search

If you are not happy with the results below please do another search

72 search results for:

11

Financing Dam Rehabilitation with Nutrient Credits

Lake Overton Dam is a failing High Hazard dam that is privately owned and operated in Henrico, Virginia. Rehabilitating the dam is cost prohibitive for the owners but is a safety concern in the county. Henrico County Department of Public Works engaged AMT Engineering to design a dam rehab that also converted the lake to […]

12

The Influence of Nitrifying Bacteria on Monochloramine Decay and Opportunistic Premise Plumbing Pathogen Growth

Drinking water infrastructure in homes and buildings provides a niche for water microbiomes. Higher surface area to volume ratios, stagnation, and disinfectant decay at point-of-use locations lead to microbial regrowth and a higher risk of exposure to opportunistic premise plumbing pathogens (OPPPs). Nitrifying bacteria are common inhabitants of drinking water systems and are known to […]

13

Municipal Separate Storm Sewer (MS4) Program Virginia Department of Environmental Quality (DEQ) Audit Observations

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 […]

14

Stormwater Enhanced Coagulant Treatment for Cost Effective Pollutant Load Reduction

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 […]

15

Water Quality Overview of Indirect Potable Reuse System in Northern Virginia

Wastewater reuse benefit water shortage and a variety purposes but effect to water quality of receiving body is a concern, especially when effluent of sewage treatment plant is introduced to source of drinking water facility. Indirect potable reclamation characterized as mixing effluent into either surface or groundwater source, subsequently flowing into drinking water treatment plant, […]

16

Reducing the Regulatory Exposure from a Municipal Landfill and Meeting Bay TMDL Waste Load Allocations – A Case Study

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 […]

17

The Restoration of Little Westham Creek – Delivering Ecological Uplift in an Urban Watershed

The restoration of Little Westham Creek on the campus of the University of Richmond is an example of how to provide water quality improvements and ecological uplift within the context of an urban watershed.  Developed as part of the City of Richmond’s MS4 TMDL program, this project has reduced sediment and nutrient loads to the […]

18

The Effect of Ventilated Shelters on Tree Seedling Growth Within a Restored Riparian Site in Virginia

Riparian forests perform valuable ecological services such as improving water quality, increasing ecological diversity, increasing carbon sequestration, and decreasing stream temperature. Within the Chesapeake Bay most riparian forests have been removed as agricultural practices have intensified. Large-scale agricultural practices increase nutrient loading into the watershed causing a decline in water quality. Restoring riparian forests offsets […]

19

Determination of Advective or Diffusive/Dispersive Water Quality Flux Domain of the Lower Portion of the James River in Richmond, Virginia

The Peclet number is a flux characteristic parameter which represents the ratio of advective transport to diffusive/dispersive transport. A higher Peclet number indicates a bulk mass flow-driven advection dominated body of water that behaves similar to a Plug Flow Reactor, while a lower Peclet number indicates a diffusive/dispersive dominated body of water which is more […]

20

Zooplankton Community Structure is More Variable Over Short Timescales than Over Space, with Implications for Water Quality Management

Zooplankton are integral components of freshwater lake and reservoir food webs. Because of their role as a food source for fish and their ability to rapidly graze down algal populations, zooplankton play a critical role in maintaining water quality. To avoid fish predation during the day, zooplankton may migrate both vertically or horizontally (Diel Vertical […]