Are shown by contour lines that bend downhill? All water flows downhill, from areas of high elevation towards areas of lower elevation. The bending of the contour lines near the river always points uphill, which means RIVERS ALWAYS FLOW IN THE OPPOSITE DIRECTION FROM THE WAY THE CONTOUR LINES BEND.
Why do contour lines always flow downhill?
All water flows downhill from high-altitude areas to low-altitude areas. The contour lines near the river are always bending uphill, which means that RIVERS FLOW IN THE OPPOSITE DIRECTION from where the CONTOUR LINES BEND. Why do contour lines never intersect each other? On a contour map, contour lines are used to represent elevation.
What are the 4 rules of contour lines?
Rule 1 - every point of a contour line has the same elevation. Rule 2 - contour lines separate uphill from downhill. Rule 3 - contour lines do not touch or cross each other except at a cliff. Rule 4 - every 5th contour line is darker in color. This is an INDEX contour line.
How do you tell if a stream has contour lines?
The elevation of the contour lines that cross the stream can be seen first. Water will always flow downhill, so the contour lines’ elevation will decrease as the water flows in the opposite direction. The contour lines’ pattern is the second way to tell. The “V”‘s” point points upstream. What is the rule of Vs for contour lines?
Which type of contour lines indicate a steep slope?
Contour lines that are very close together indicate a steep slope. The figure above illustrates various topographic features. (b) Notice how a mountain saddle, a ridge, a stream, a steep area, and a flat area are shown with contour lines. The figure above illustrates a depression and its representation using contour lines.
What does it mean when contour lines bend?
Contour lines trend up valleys, cross streams, and return down the valleys on the opposite side, thus forming a V (or a U) that points upstream: A contour line bends upstream when crossing a stream and forms a V whose apex or point always points upstream.
Do contour lines point uphill or downhill?
Closely spaced contour lines indicate very steep slopes. Contour lines that are sharply tapered indicate an uphill direction. Rounded contour lines typically indicate a downhill direction.
What lines are called contour lines?
contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level.
What are the 3 types of contour lines?
There are 3 kinds of contour lines you'll see on a map: intermediate, index, and supplementary. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. This tells you the elevation above sea level.
What are contours of a hill slope?
In hilly areas, the contour lines are close together while they are wider apart on flat slopes. The closer the contour lines, the steeper the slope. The wider the contour lines, the flatter the slopes. On a hill, the contour lines form circles; whereby the values of their elevation increase from the edge to the centre.
Do contour lines bend upstream or downstream?
The origin of a stream on a map is called the “headwaters”. The stream always flows downhill from that point. Contour lines always bend to point uphill when they cross a gully or drainage.
What is contour also known as?
Some common synonyms of contour are outline, profile, and silhouette. While all these words mean "the line that bounds and gives form to something," contour stresses the quality of an outline or a bounding surface as being smooth, jagged, curving, or sharply angled.
What are the five types of contour lines?
Types of Contour Lines in Surveying and their ImportanceIsopleth.Isohyet.Isobar.Isobath.Isohaline.Isotherm.Isohel.Isohume.More items...•
What is a contour line shape?
In art, contour lines define the edges of an object. They tend to show only the edges of a shape and the important lines within the inside of a shape.
What are 2 types of contour drawing?
There are several different types of contour line drawings:Blind Contour. 'Blind contour drawing' is when contour drawing is done without looking at the paper AT ALL. ... Continuous Line Contour. ... Modified Contour. ... cross-contour. ... YOUR ASSIGNMENTS:
What are the 4 characteristics of contour lines?
Characteristics of ContoursMust close on themselves, on or off the map.Perpendicular to the direction of max. ... Slope between them is assumed uniform.The distance between them indicates the steepness of the slope, gentle or steep.Irregular signify rough, smooth signify gradual slopes.More items...
How many types of contouring are there?
Contour lines are of three different kinds. They are the Index lines, Intermediate lines and the Supplementary lines. Thus, this is the correct option.
Which way do contour lines point?
Rules of Contour Lines By definition, contour lines separate points of higher elevation from points of lower elevation. This means it is always possible to define an “uphill” direction on one side of a contour and a “downhill” direction on the other side. Contour lines never cross.
How do you tell if contour lines are going up or down?
Remember contour numbering reads up hill – in other words the top of the number is uphill and the bottom is downhill. Also remember the closer contour lines are together, the steeper the slope.
What are the 4 rules of contour lines?
Rule 1 - every point of a contour line has the same elevation. Rule 2 - contour lines separate uphill from downhill. Rule 3 - contour lines do not touch or cross each other except at a cliff. Rule 4 - every 5th contour line is darker in color.
What are the 5 Rules of contour lines?
General Rules for contour lines Page 2 Page 3 A contour line connects points of equal elevation. A contour line never branches or splits Page 5 Steep slopes are shown by closely spaced contour lines. Contour lines never cross, but they may touch. Hills are represented by a concentric series of closed contour lines.
What is contour line?
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.#N#If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation. As a contour approaches a stream, canyon, or drainage area, the contour lines turn upstream. They then cross the stream and turn back along the opposite bank of the stream forming a "v". A rounded contour indicates a flatter or wider drainage or spur. Contour lines tend to enclose the smallest areas on ridge tops, which are often narrow or very limited in spatial extent. Sharp contour points indicate pointed ridges.#N#Example 1 - In the graphic below, what is the vertical distance between the contour lines?#N#Pick two contour lines that are next to each other and find the difference in associated numbers.#N#40 feet - 20 feet = 20 feet#N#The contour lines in this figure are equally spaced. The even spacing indicates the hill has a uniform slope. From the contour map, a profile can be drawn of the terrain.#N#Example 2 - Draw a profile showing the elevations of the contours.#N#Note: The intervals are increasing, therefore, the contours indicate a hill. The peak is normally considered to be located at half the interval distance.#N#Widely separated contour lines indicate a gentle slope. Contour lines that are very close together indicate a steep slope.#N#The figure above illustrates various topographic features. (b) Notice how a mountain saddle, a ridge, a stream, a steep area, and a flat area are shown with contour lines.#N#The figure above illustrates a depression and its representation using contour lines. Notice the tick marks pointing toward lower elevation.
What does a rounded contour mean?
A rounded contour indicates a flatter or wider drainage or spur. Contour lines tend to enclose the smallest areas on ridge tops, which are often narrow or very limited in spatial extent. Sharp contour points indicate pointed ridges.
What happens when contour lines decrease?
If the numbers associated with the contour lines are decreasing, there is a decrease in elevation. As a contour approaches a stream, canyon, or drainage area, the contour lines turn upstream. They then cross the stream and turn back along the opposite bank of the stream forming a "v".
