OBJ 3.3

Question 1

Retention Pond

Answer 1

Low-lying area designed to hold water for long periods.

Question 2

Detention Pond

Answer 2

Low-lying area designed to temporarily hold water, often used as a means of flood control near large areas of non-porous surfaces (e.g., a large parking lot).

Question 3

Graphic Representation of Swale/Valley

Answer 3

A length of depression in the land without flowing water that is typically vegetated and can be seasonally wet. Graphically, the contours point up toward the higher elevation.

Question 4

Graphic Representation of Crown/Ridge

Answer 4

Elevated portion of land from which water flows down. Graphically, the contours point down toward the lower elevation.

Question 5

Contour Interval

Answer 5

Represents the change in elevation between two contours. Larger scales have smaller intervals, and smaller scales have larger intervals for clarity of drawings.

Question 6

Local Road

Answer 6

Low-capacity road with direct access to site.

Question 7

Collector Road

Answer 7

Connection road between local and arterial streets.

Question 8

Arterial Road

Answer 8

Wide-capacity street, usually connecting to an expressway.

Question 9

Expressway

Answer 9

Limited-access road with high speed and high volume circulation.

Question 10

What is the difference between a swale and a crown? Identify the corresponding contour representation.

Answer 10

Swale is a low tract of land, often marshy, that is important for irrigation. Crown is a raised area, often referring to the high point of a road or field for proper water drainage.