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One of the first actions when evaluating a design is to select a hydrologic modeling program that evaluates the runoff-storage relationship within a contributing watershed. Sometimes this selection is made quickly without significant consideration of the end goal, or whether model results are comparable between different hydrologic programs. In theory, modelers can employ various hydrologic […]
Stormwater Master Planning helps to identify where future investments are needed by deficiencies of the existing stormwater system. At the planning stage, many assumptions are made, which are based on the best available information. But what happens when elements of that Master Plan move into design and field discoveries and phasing plans challenge these assumptions? […]
DEQ has published a Notice of Intended Regulatory Action for amending and reissuing the General VPDES Permit for Discharges of Stormwater from Small MS4s, which expires on October 31, 2023. This presentation takes a look at other MS4 General Permits recently adopted across the United States including EPA’s 2021 New Hampshire MS4 General Permit to […]
Historically, stormwater utilities (SWUs) in Virginia and around the country have primarily utilized the impervious surface rate methodology to develop the billing unit by which the SWUs fees are charged. In its simplest form, the SWU uses either a sample of several hundred single-family residential (SFR) parcels or an entire SFR parcel planimetric dataset, to […]
The arrival of Artificial Intelligence for the masses in late 2022 opened a world of previously unimagined possibilities for anyone engaged in technical work. With a little perseverance and some natural language and logic skills, engineers now have problem-solving superpowers. Clearly, we’re not in Kansas anymore. Some have been quick to adapt, others not so […]
In 2018, Wood kicked-off a project with the Maryland Department of the Environment (MDE), Maryland Environmental Service (MES), the US Army Corps of Engineers (USACE) to research the use of NOAA’s National Water Model (NWM) for riverine flood forecasting. The National Water Model (NWM) “is a hydrologic model that simulates observed and forecast streamflow over […]
In August 2022, GKY and Associates, Inc. (GKY) submitted the Salters Creek Watershed Study report to the City of Hampton. GKY employed a combined 1D/2D model using PCSWMM to quantify existing condition flooding and then identified potential improvement projects to reduce that flooding. The study identified fifteen specific improvement projects to reduce the depth and […]
This presentation will highlight major Program changes that are part of the ongoing NFIP “Transformation” including enhanced data reporting and analytics, updates to the NFIP “Moonshot” efforts, and, perhaps most important, the upcoming introduction of a brand new rating methodology, Risk Rating 2.0. Finally, we will touch upon outreach tools and strategies available to Floodplain […]
The Commonwealth of Virginia’s November 2010 Chesapeake Bay Watershed Implementation Plan included its regulatory plan to ensure MS4s implemented necessary pollutant reductions. This regulatory plan details the back-end dominated pollutant reduction MS4 permitting strategy that DEQ selected to employ over three five-year VPDES permit cycles, beginning in 2013. On March 12, 2020, Virginia Governor Ralph […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
