Quick Answer: What Is Runoff Coefficient In Hydrology?

What are examples of runoff?

Runoff from nonpoint sources includes lawn fertilizer, car exhaust, and even spilled gasoline from a car.

Farms are a huge nonpoint source of runoff, as rainwater and irrigation drain fertilizers and pesticides into bodies of water.

Impervious surfaces, or surfaces that can’t absorb water, increase runoff..

What is runoff and its types?

3 Runoff can be defined as the portion of the precipitation that makes it’s way towards rivers or oceans etc, as surface or subsurface flow. Surface runoff can be generated either by rainfall, snowfall or by the melting of snow, or glaciers. … Types of Runoff: Surface runoff/ Sub-surface runoff or Base flow.

What is another word for runoff?

Runoff Synonyms – WordHippo Thesaurus….What is another word for runoff?sewageexcrementoutpouringemanationeffluenceeffluxpollutionseepageoverflowliquid waste49 more rows

What is runoff harvesting?

Surface runoff water harvesting is the collection, accumulation, treatment or purification, and storing of stormwater for its eventual reuse. It can also include other catchment areas from manmade surfaces, such as roads, or other urban environments such as parks, gardens and playing fields.

What is the difference between runoff and discharge?

Thus, the terms discharge, streamflow, and runoff represent water with the solids dissolved in it and the sediment mixed with it. Of these terms, discharge is the most comprehensive. … The differentiation between runoff as a volume and streamflow as a rate is not accepted.

What is runoff in hydrology?

Runoff, in hydrology, quantity of water discharged in surface streams. … Runoff also includes groundwater that is discharged into a stream; streamflow that is composed entirely of groundwater is termed base flow, or fair-weather runoff, and it occurs where a stream channel intersects the water table.

What is the coefficient of runoff?

The runoff coefficient (C) is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received. It is a larger value for areas with low infiltration and high runoff (pavement, steep gradient), and lower for permeable, well vegetated areas (forest, flat land).

What is a runoff ratio?

Runoff ratio is the runoff for each watershed divided by the precipitation for that watershed. It is the proportion of rainfall that does not infiltrate and is not taken up by evapotranspiration, and thus ends up as runoff. … These areas will have high runoff ratios.

How do you calculate runoff coefficient?

How to Calculate Runoff CoefficientThe Rational Method is used for areas less than 50 acres. … Find the appropriate values for each variable. … Calculate the value for “i.” This is a measurement of rainfall intensity. … Isolate and solve for “C.” Your altered equation should look like this: … Find a reputable runoff coefficient table (see Resources).More items…

What does runoff mean?

(Entry 1 of 2) 1 : a final race, contest, or election to decide an earlier one that has not resulted in a decision in favor of any one competitor. 2 : the portion of precipitation on land that ultimately reaches streams often with dissolved or suspended material. run off.

What is rainfall runoff relationship?

the rainfall-runoff relationship for any rainstorm depends on the dynamic interaction between rain intensity, soil infiltration and surface storage. Runoff occurs whenever rain intensity exceeds the infiltration capacity of the soil, providing there are no physical obstructions to surface flow.

What are the different types of runoff?

Types of Runoff There are three major types of runoff depending on the source: surface flow, interflow, and base flow. These were discussed in Module 101 and are ex- panded upon here. Surface Flow Surface flow is water that has remained on the surface and moves as overland or channel flow.

How do humans affect runoff?

Human activities can affect runoff In addition to increasing imperviousness, removal of vegetation and soil, grading the land surface, and constructing drainage networks increase runoff volumes and shorten runoff time into streams from rainfall and snowmelt.

What are the 2 types of runoff?

Runoff may be classified according to speed of appearance after rainfall or melting snow as direct runoff or base runoff, and according to source as surface runoff, storm interflow, or groundwater runoff. 2. The sum of total discharges described in (1), above, during a specified period of time.