Landscape Hydrology and Hydraulics 512/C23a LandscapeHydrology 2016.pdf · 2 1.Hydrological...
Transcript of Landscape Hydrology and Hydraulics 512/C23a LandscapeHydrology 2016.pdf · 2 1.Hydrological...
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1.Hydrological Analysis
2.Hydraulic Design of
Structures
Scope of Drainage Design and Construction
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HYDROLOGY – Factors affecting runoff
1. Catchment Area
2. Rainfall
3. Topography
4. Vegetation and Soil
5. Catchment Shape
6. Avaialable storage – lake/swamp
7. Degree of urbanisation
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Hydrology – Catchment area
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Hydrology – topography
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Hydrology – rainfall
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Major Waterway
Pond
Hydrology - storage
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Existing Landuse–vegetation/development/urbaniz
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HYDROLOGY – Rational Method
or
Q = CIA/360
A = area in hectare (ha)
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Rainfall intensity , I
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Intensity
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Intensity
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Runoff Coefficient C
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Time of Concentration , Tc or Rainfall Duration
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Time of Concentration , Urbanizing area
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1
10
100
1000
1 10 100 1000 10000
Inte
nsiti (m
m/h
r)
Duration (min)
ARI 2
ARI 5
ARI 10
ARI 20
ARI 50
ARI 100
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Hydraulic – Manning Eq
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Hydraulic – Manning coeff