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Learning to use AutoCAD for Civil Engineering Projects
AutoCAD 2010 for Civil Engineering, The hydrological cycle can be affected by the environmental effect and by humans. The following list shows some of the human factors affecting the water cycle. Agriculture Alteration of the chemical composition of the atmosphere Construction of dams Deforestation and afforestation Removal of groundwater from wells Water abstraction from rivers Urbanization.
Watershed delineation using AutoCAD As mentioned before, the two major steps in watershed delineation is the selection of the outlet point and drawing the lines perpendicular to the contour line. In AutoCAD this delineation can be marked using the following steps.
The drainage area (A) is probably the single most important watershed characteristic for a hydrologic design. It reflects the volume of water that can be generated from rainfall. The drainage area is used to indicate the potential for rainfall to provide a volume of water. It is common in hydrologic design to assume a constant depth of rainfall occurring uniformly over the watershed. Under this assumption, the volume of the water available for the runoff would be the product of rainfall depth and the drainage area. Thus the drainage area is required as input to models ranging from simple linear prediction equations to complex computer models.
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