Interpretation of Topographical Maps — I — Question 5

Causeway — A raised road or platform across a stream is known as Causeway. A stream having a causeway is motorable during dry season. Hence too many causeways indicate scanty or seasonal rainfall.

Contours — The lines drawn in brown colour, joining places having same elevation above sea level are called contours.

Depression — A hollow created on the top of mound or dune in sandy area, formed by blowing away of sand by the wind is called depression.

Stony waste — The land covered with rock boulders and stones, where cultivation is not possible is called Stony waste. It is shown on a survey sheet as a white patch.

Fire line — A clearing made in the forest to prevent spread of fire is called fire line.

Surveyed tree — It serves as a prominent survey point, shown in black.

Brackish— Brackish written beside a perennial lined well indicates that the water of the well is salty, and not fit for irrigation or drinking.

Meander— A bend in the river flowing through a flat land or plain during its middle stage is called meander.

Broken ground— Uncultivable land, generally found along the banks of a stream of river in arid regions where the top soil is easily eroded due to flooding during rainy season is called broken ground.

Embankment— A bank or mound constructed along a tank or artificial lake to prevent flooding is called embankment.

Diggi— A tank that is used for the collection of water is called diggi.

Pylons— Tall metal structures that holds electric cables high above the ground are called pylons.