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resulted in substantial increases in the portion of design storm rainfall inﬁ ltrated into the subsoil throughout both North and South Carolina (Figure 2). As concerns related to post-development hydrology continue to grow, there is a need for effective manage-ment strategies, such as LID. Based upon simulation re-sults, permeable pavement and bioretention can provide substantial reductions in runoff volume, even in areas where sandy soils are not predominant, provided other site-speciﬁ c criteria are satisﬁ ed. Particularly in areas where these practices have not been historically imple-mented, an understanding of important design constraints and system function is imperative. Through the use of de-sign review and basic simulation tools similar to the one presented here, it should be possible to educate designers, property owners, and regulators about these practices, al-lowing for more informed evaluations of the hydrologic beneﬁ ts these systems may provide. Natural Resources Conservation Service. 2011a. Soil Survey Geographic (SSURGO) Database for North Carolina . http://soildatamart.nrcs.usda.gov Natural Resources Conservation Service. 2011b. Soil Survey Geographic (SSURGO) Database for South Carolina . http://soildatamart.nrcs.usda.gov Matthew Jones, P.E., Ph.D. , is an engineer with Hazen and Sawyer P C in Raleigh, NC. Scan here to share this article or read later. Get the app at http://gettag.mobi Clariﬁ cation With regard to the article “Runoff Modeling for Rain Gardens” in the July/August 2011 issue, staff from the city of Aurora, IL, Department of Engineering provided all engineering design for the Spring Street rain gardens. Planting plans for the project were prepared by Hey and Associates Inc. Construction ob-servation was completed by staff from both the city of Aurora and Hey and Associates. Funding for the project was provided in part by an Illinois EPA Section 319 grant administered by the Chicago Metropolitan Agency for Planning (CMAP). These grant funds paid for Hey and Associates’ involvement as CMAP’s technical advisor and for project construction. References Froehlich, D. C. 2009. “Mathematical Formulations of NRCS 24-Hour Design Storms.” Journal of Irrigation and Drainage Engineering 135(2): 241–247. NOAA/NWS/Ofﬁ ce of Hydrologic Development, Hydrometeoro-logical Design Studies Center. 2006. NOAA Atlas 14, Volume 2, Version 3 Gridded Precipitation Frequency Estimates for the Ohio River Basin and Surrounding States . Learn & Earn with Forester U 2012 Webinars New Register Today! Nutrient Sources and Transformations: How to Optimize Nutrient Removal in SCMs William Lucas, Principal, Integrated Land Management, Inc. Thursday, April 26 1 PDH / 0.1 CEU Credit While nitrogen and phosphorus are a major concern in many watersheds in the US, most Stormwater Control Measures (SCMs) are not as effective as possible in removing nitrogen and phosphorus from runoff. Join William Lucas to explore how to select and design SCMs to improve nitrogen and phosphorus retention. After an overview of nitrogen and phosphorous forms, sources, and transformations, Lucas will discuss how nitrogen and phosphorus trans-formations can be optimized in SCMs how to select and design SCMs for settings and how to tailor these programs to meet TMDL requirements more cost effectively. Upcoming Webinars s April 12 Water Auditing 101 Troy Aichele, LEED AP (O+M), Aichele and Associates, LLC 1 PDH / 0.1 CEU s April 18–May 25 Sediment and Erosion Control Master Class Series Jerald S. Fiﬁeld, Ph.D., CISEC, CPESC & Tina R. Evans, PE, CISEC, HydroDynamics Inc. Like us @ Forester.University Follow us @ ForesterU Add us @ Forester.University Subscribe @ ForesterUniversity 9 PDH / 0.9 CEU s May 3 How to Conduct a Water Audit and Avoid Auditing Pitfalls Troy Aichele, LEED AP (O+M), Aichele and Associates, LLC 1 PDH / 0.9 CEU y @ Register toda .net! ersity ForesterUniv FU_SW1205_House_Lucas_5p Develop your skills and earn PDH/CEU credits at Forester University–without the hassle. 58 May 2012 www.stormh2o.com