Unit Hydrograph Theory
PPT Slide
Unit Hydrograph “Lingo”
Graphical Representation
Methods of Developing UHG’s
Unit Hydrograph
Derived Unit Hydrograph
Deriving a UHG from a Storm sample watershed = 450 mi2
Separation of Baseflow
Semi-log Plot
Hydrograph & Baseflow
Separate Baseflow
Sample Calculations
Obtain UHG Ordinates
Final UHG
Determine Duration of UHG
Estimating Excess Precip.
Excess Precipitation
Changing the Duration
Develop S-Curve
Convert to 1-Hour Duration
Final 1-hour UHG
Shortcut Method
Shortcut Method Example
Average Several UHG’s
Synthetic UHG’s
Snyder
Basic Relationships
Final Shape
SCS
Dimensionless Ratios
Triangular Representation
484 ?
Duration & Timing?
Time of Concentration
A Regression Equation
Segmental Approach
A Basic Approach
Triangular Shape
Fitting a Gamma Distribution
Time-Area
Hypothetical Example
Rule of Thumb
Basin Breakdown
Incremental Area
Cumulative Time-Area Curve
Trouble Getting a Time-Area Curve?
Instantaneous UHG
Computations
Incremental Areas
Incremental Flows
Lag & Average
Geomorphologic
Strahler Stream Ordering
Probability Concepts
GIUH Equations
Email: frf@riverside.com
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