NRCS DIMENSIONLESS UNIT HYDROGRAPH

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Presentation transcript:

NRCS DIMENSIONLESS UNIT HYDROGRAPH

NRCS DIMENSIONLESS UNIT HYDROGRAPH Time/Tpeak q/qpeak or Qa/Q 1.0 1 5 q = Discharge at time 1 q p = Peak Discharge Qa = Accumulated Volume at time 1 Q = Total Volume = A Selected Time To = Time from Beginning of the rise of the peak 3/8 5/8 tl

PEAK FLOW

Timing Considerations Lag Equation (Regression) Segmental Method (Physically Based)

Lag Equation

Segmental Method Sheet Flow – Overland Flow Shallow Concentrated Flow (Rills and Gullies Open Channel or Pipe Flow (Conveyance System

Sheet Flow Precipitation Sheet Flow Sheet flow Infiltration

Sheet Flow Sheet Flow Sheet flow Infiltration L ???

Sheet Flow Where: 0 < L < 100 ft S = slope ft/ft P = 2-year 24-hour Precipitation

Shallow Concentrated Flow

Shallow Concentrated Flow Velocity in fps Slope in ft/ft Land Use Curves

Open Channel Flow n = 0.06 n = 0.07 n = 0.035

Topen channel flow = Length/Velocity

Time of Travel Tt = t1 + t2 + t3 Sheet Flow Shallow Concentrated Flow Open Channel or Pipe Flow