cee5734_week1_2011

cee5734_week1_2011 - CEE 5734 Urban Hydrology and...

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Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Course Introduction, the Rational Method, and Inlet Design CEE 5734 – Urban Hydrology and Stormwater Management Week 1
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Introductions Safety Statement Overview of Course Begin Course Material Rational Method IDF curves Inlet Design Pipe Design Today’s Agenda
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Please read: “1 page Emergency Preparedness Document.doc” Designation of Emergency Assembly Point: Falls Church: Picnic tables between NVC building and parking lot. Blacksburg: Other sites: Safety Statement
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Hydrology: literally the “study of water” We are interested in both scientific understanding (analysis) and engineering issues (design). We are interested in both water quantity and water quality . Urban: emphasis on issues with urban infrastructure How does the presence of urban structures affect the hydrology? (Analysis question) How do we build structures to convey stormwater in an urban setting? (Design question) Overview: What is Urban Hydrology?
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What is urbanization? Definition: Urbanization is the transition of land use from forest or agriculture to residential and commercial purposes. Hallmarks: Land is cleared of vegetation Impervious surfaces (roads, parking lots, rooftops) are added Drainage “improvements”are constructed (e.g. curb & gutter, storm sewers, channel re-alignments or linings)
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Hydrology 101… Horizontal axis: time (minutes, hours, days) depends on scale of watershed (e.g. Potomac crested at 2pm September 23 after Hurricane Isabel (which hit on September 18-19) Vertical axis: discharge ( Q ) in units of ft 3 /s.
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What are the hydrologic effects of urbanization?
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As urbanization takes place: Flood hydrograph volume increases Flood peak increases Timing of hydrograph peak decreases What are the hydrologic effects of urbanization?
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Land Use Change Animation Northwest Branch Watershed: 1938 - 2000. Based on methods presented in Moglen and Beighley, JAWRA 2002
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Urbanization - changes in daily discharge record
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Water Quantity: Rational Method NRCS methods Peak Flow Control BMPs (detention basins) SWMM modeling (w/ focus on water quantity) Water Quality: Urbanization and water quality SWMM modeling (w/ focus on water quality) Water quality-oriented BMPs BMP optimization LID (time permitting) Course Overview: Topics we will examine
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Rule 1: Exact numbers have infinite significant digits. Ex: A dozen eggs is exactly 12 eggs. Rule 2: Zeros used just to position the decimal point are not significant figures. Trailing zeros are not significant unless a decimal point is explicitly indicated. Ex: 0.0234
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cee5734_week1_2011 - CEE 5734 Urban Hydrology and...

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