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Part or all of this report is presented in Portable Document Format Maryland-Delaware-District of Columbia Water Science Center Storms and floods of July 30, 2016, and May 27, 2018, in Ellicott City, Howard County, Maryland Historical Perspective: July 2016 and May 2018 Floods.Indirect Measurements of Peak Discharge in Ellicott City Watersheds.Description of Storm and Flood of May 27, 2018.Description of Storm and Flood of July 30, 2016.History of Flooding in Ellicott City, Maryland.Geological Survey Fact Sheet 2021–3025, 6 p. Suggested Citationĭoheny, E.J., and Nealen, C.W., 2021, Storms and floods of July 30, 2016, and May 27, 2018, in Ellicott City, Howard County, Maryland: U.S. The findings indicate that although the Ellicott City storms and floods from July 30, 2016, and May 27, 2018, are considered very rare in terms of their probability of occurrence, other storms have occurred in the Maryland and Delaware regions in the past that have produced comparable runoff characteristics relative to drainage-area magnitude. To provide historical perspective on these floods in Ellicott City, results from the indirect discharge measurement computations were compared to peak flows from 75 USGS streamgages and 6 miscellaneous sites in Maryland and Delaware that resulted from intense storms in August and September 1971 (Carpenter, 1974). Peak discharges computed from the indirect discharge measurements for Hudson Branch, Tiber Branch, and New Cut Branch are presented for the storms and floods of July 30, 2016, and May 27, 2018. The storms and flood characteristics for July 30, 2016, and May 27, 2018, are described. This fact sheet describes the basin characteristics, hydrologic characteristics, and flood history of the Ellicott City, Maryland, area. Peak flows were computed using flow-through-culvert techniques with road overflow for Hudson Branch and slope-area techniques for Tiber Branch and New Cut Branch. High-water marks were flagged on selected reaches of three streams, Hudson Branch (station 01589017), Tiber Branch (station 01589019), and New Cut Branch (station 01589021) (fig. Geological Survey (USGS) performed indirect discharge measurements to determine peak flow on the three streams that drain through the downtown area of Ellicott City and empty into the Patapsco River. In the aftermath of both storms, personnel from the U.S. As work continues on building two retention ponds in the upper watershed, including one at the. Precipitation from the 2018 storm totaled 6.56 inches in 3 hours (National Oceanic and Atmospheric Administration, 2018). Ellicott City continues to recover after it was struck by two 100-year flood events over two years. Precipitation from the 2016 event totaled 6.60 inches in 3 hours (National Oceanic and Atmospheric Administration, 2016). 1), was severely flooded by intense, short-duration rainfall that resulted in loss of life significant damage to buildings, roads, infrastructure and hundreds of vehicles washed away. On July 30, 2016, and May 27, 2018, the downtown area of Ellicott City, Maryland (fig. © 2020 FloodMap.Director, Maryland-Delaware-D.C. Notes:Before using this Flood Map application, please note that for various technical or non technical reasons the application is not guaranteed free of bugs or inaccuracies. Negative elevation means depth below sea level.ĭata Sources: Mazpzen, TNM, SRTM, GMTED, ETOPO1 The elevation layered on the map is in meters and is from sea level. By setting negative elevation, Bathymetry study is also possible.We also think that it can help in planning irrigation system and water management.It can help to perform elevation analysis of an area for any purpose like city/town planning, new construction etc.Global Warmin and Sea Levele Rise are the effects of Climate Change.Effect of sea level rise or sea level change can be seen on the map.It can also provide floodplain map and floodline map for streams and rivers.Ellicott City, US Flood Map can help to locate places at higher levels to escape from floods or in flood rescue/flood relief operation.Ellicott City, US Flood Map may help to provide flood alert/flood warning if flood water level at certain point is rising.Ellicott City, US Flood Map may be useful to some extent for flood risk assessment or in flood management, flood control etc.
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