PPT Slide

This graph illustrates the effects of urbanization on hydrograph peak discharge. In pre-developed conditions, flow gradually increases to a relatively flat peak and gradually descends to a low flow condition. In the urbanized condition, flow rapidly increases to a peak and just as sharply descends, often to a lower flow condition than pre-development.

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Notes:

Consequently, the peak discharge of urban streams is higher and occurs sooner than in streams with pre-development conditions.

This slide illustrates the effect of urbanization on hydrograph peak discharge. Under pre-developed conditions, flow gradually increases to a relatively flat peak and gradually descends to a low flow condition. In the urbanized condition, flow rapidly increases to a peak and just as sharply descends, often to a low flow condition less than the pre-development condition.