Stormwater management Flashcards Preview

Reviewer: Landscape Site Utilities and Earthworks > Stormwater management > Flashcards

Flashcards in Stormwater management Deck (23)
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1
Q

Storm water that moves on the ground by gravity and flows into streams, rivers, ponds, lakes, and oceans

A

Surface runoff

2
Q

Storm water that infiltrate and moves through the soil both horizontally and vertically

A

Subsurface runoff

3
Q

A structure typically concrete block or precast concrete rings, 2.5 to 4 ft. in diameter, used to collect and divert surface runoff to an underground conduction system

A

Catch basin

4
Q

A general rule of thumb is that one catch basin may be used for each _________ sq. feet of paved surface

A

10,000

5
Q

A structure that allows surface runoff to enter directly into a drain pipe; unlike the catch basin, this does not contain a sump

A

Drain inlet

6
Q

A prefabricated structure, similar to a floor drain, that collects runoff from paved areas

A

Area drain

7
Q

Usually, one area drain is used for each _______ to ________ sq. feet of pavement

A

1000-2000

8
Q

A linear inlet structure used to collect sheet flow runoff in paved areas

A

Trench drain

9
Q

Manholes are often _________ ft. in diameter, made of concrete block, precast concrete, or fiberglass-reinforced plastic rings, which allows a person to enter a space below ground

A

4

10
Q

Any structure not classed as a bridge, which allows a water course to flow beneath a road, walk, or highway

A

Culvert

11
Q

An impoundment area constructed to collect storm runoff from a management system for the purpose of reducing peak flow and controlling the rate of flow; defined as having a permanent pool

A

Retention basin

12
Q

An impoundment area constructed to collect storm runoff from a management system for the purpose of reducing peak flow and controlling the rate of flow; normally dry

A

Detention basin

13
Q

An impoundment area or structure that slows the velocity of runoff in order to allow sediment particles to settle out

A

Sediment basin

14
Q

A constructed or natural drainage channel used to direct surface flow

A

Swale

15
Q

A trench filled with porous material which is used to collect and conduct surface runoff

A

French drain

16
Q

Drainage areas that are thousands of square miles

A

Watershed

17
Q

The runoff coefficient which represents a completely pervious surface from which there is no runoff

A

0

18
Q

The runoff coefficient which represents a completely impervious and wetted surface from which there is total runoff

A

1

19
Q

The number of years during which the design storm, or a storm exceeding it, statistically, may be expected to occur once

A

Storm frequency

20
Q

A storm with a frequency and duration for which the management system is designed; based on economics, environmental context, and the ultimate consequences should the system overflow

A

Design storm

21
Q

The time for water to flow from the hydraulically most remote part of the drainage area to the section under consideration

A

Time of concentration

22
Q

Typical pipe gradients for lawn areas

A
  1. 1% (minimum)

1. 0% (maximum)

23
Q

The depth of water removed over the drainage area in 24 hours

A

Drainage coefficient