CEIE 340 Lecture 3 Watershed characteristics

CEIE 340 Lecture 3 Watershed characteristics - Watershed...

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1 Water Resource Engineering CEIE 340 Sayedul H. Choudhury, Ph.D. Watershed Characteristics Today’s Topics s Watershed: Geomorphology s Area, Length and Slope s Hypsometric Curve, Watershed Shape s Landcover and Landuse s Surface Roughness s Soil Characteristics s Profile, Texture, Structure, Volumetric Characteristics s Soil Moisture s Hydrologic Soil Groups and Soil-Cover Condition s Channel Geomorphology s Length, Slope, Drainage Density s Cross-section, Roughness s Uniform-Flow Computation
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2 Today’s Topics (Cont’d) s Travel Time s Velocity Method s Sheet-Flow s SCS Lag Formula s Runoff Curve Numbers s Soil-Group Classification s Cover-Complex Classification s SCS Curve Number s Antecedent Moisture Condition Hydrologic Cycle P Q i Q o R
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3 Definition s A watershed is defined by all points enclosed within an area from which rain falling at these points will contribute water to outlet (most downstream point). Watershed Delineation
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4 Drainage Area s Most important watershed characteristic s Determines the volume of water that can be generated by a storm Drainage Area (Cont’d) Compute peak flow based on historic data
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5 Watershed Length s Distance along the path of the greatest volume of flow s Time-of- concentration is larger for a watershed of longer length, if other characteristics remain the same Flow (cfs) Time (hour) Longer Length Shorter Length Watershed Slope s Slope along the principal flow path s Steeper slope generates faster runoff and, therefore, higher peak flow
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CEIE 340 Lecture 3 Watershed characteristics - Watershed...

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