Question

dry river bed with water channel what does it indicates in a topographical map​

Answer 1

Answer:

it receives scanty rainfall

Answer 2

Explanation:

Reading Topographic Maps

Interpreting the colored lines, areas, and other symbols is the fi rst

step in using topographic maps. Features are shown as points, lines,

or areas, depending on their size and extent. For example, individual

houses may be shown as small black squares. For larger buildings,

the actual shapes are mapped. In densely built-up areas, most individual buildings are omitted and an area tint is shown. On some

maps, post offi ces, churches, city halls, and other landmark buildings

are shown within the tinted area.

The fi rst features usually noticed on a topographic map are the

area features, such as vegetation (green), water (blue), and densely

built-up areas (gray or red).

Many features are shown by lines that may be straight, curved,

solid, dashed, dotted, or in any combination. The colors of the lines

usually indicate similar classes of information: topographic contours

(brown); lakes, streams, irrigation ditches, and other hydrographic

features (blue); land grids and important roads (red); and other roads

and trails, railroads, boundaries, and other cultural features (black).

At one time, purple was used as a revision color to show all feature

changes. Currently, purple is not used in our revision program, but

purple features are still present on many existing maps.

Various point symbols are used to depict features such as buildings,

campgrounds, springs, water tanks, mines, survey control points,

and wells. Names of places and features are shown in a color corresponding to the type of feature. Many features are identifi ed by

labels, such as “Substation” or “Golf Course.”

Topographic contours are shown in brown by lines of different

widths. Each contour is a line of equal elevation; therefore, contours

never cross. They show the general shape of the terrain. To help

the user determine elevations, index contours are wider. Elevation

values are printed in several places along these lines. The narrower

intermediate and supplementary contours found between the index

contours help to show more details of the land surface shape. Contours that are very close together represent steep slopes. Widely

spaced contours or an absence of contours means that the ground

slope is relatively level. The elevation difference between adjacent

contour lines, called the contour interval, is selected to best show

the general shape of the terrain. A map of a relatively fl at area may

have a contour interval of 10 feet or less. Maps in mountainous

areas may have contour intervals of 100 feet or more. The contour

interval is printed in the margin of each U.S. Geological Survey

(USGS) map.

Bathymetric contours are shown in blue or black, depending on

their location. They show the shape and slope of the ocean bottom

surface. The bathymetric contour interval may vary on each map and

is explained in the map margin.