7

Runoff

ChapterOutline

7.1 Definition

7.2 Catchment area

7.3 Classification of catchment areas

7.4 Catchment flow characteristics

7.5 Process of runoff

7.6 Classification of streams

7.7 Stream patterns

7.8 Factors affecting runoff

7.9 Sources or components of runoff

7.10 Estimation of runoff

7.11 Dependable flow

7.12 Flow duration curve

7.13 Runoff coefficient

7.14 Runoff cycle

7.1 DEFINITION

‘Runoff’ is that part of precipitation that appears in a drainage channel as surface flow in a perennial or an intermittent form. It is that part of water, which can be used for engineering purposes and hence is also known as yield of catchment.

The yield from a catchment is generally expressed in terms of volume, in a season or a year.

Fig. 7.1

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