![]() However, if your land has a fairly steep slope it may be worthwhile considering a split-level design, which will reduce overall construction costs. ![]() Generally speaking, the greater the slope of the land the greater the cost to build. So it’s a good idea to ask your builder to undertake a Contour Survey and soil test to firm up the price of your build before you sign a tender. This means that the tender will be subject to a Contour Surveyor and site investigation, and therefore allowances will be made for these items. Some builders will not undertake the Contour Survey until after the tender has been signed. Equally spaced contour lines means that the land has a uniform slope.Widely spaced contour lines means that the land has a gentle slope.Closely spaced contour lines means that the land has a steep slope.All points along any single contour line have the same elevation.If you are trying to interpret a Contour Survey, keep the following tips in mind: The information collected from the Contour Survey is fundamental to determine the design of your new home, whether drop edge beams are required, the amount of cut and fill required and the location of service connections.īelow is an example of a Contour Surveyor: From the contours, it is possible to determine the capacity of a reservoir.A Contour Survey shows the slope of your land and is generally done at the same time as soil testing. This study is very important in locating bunds, dams and also to find out flood levels.Ħ. Catchment area and hence quantity of water flow at any point of nalla or river can be found. The routes of the railway, road, canal or sewer lines can be decided so as to minimize and balance earthworks.ĥ. Intervisibility of any two points can be found by drawing profile of the ground along that line.Ĥ. It helps in finding out depth of cutting and filling, if formation level of road/railway is decided.ģ. By drawing the section in the plan, it is possible to find out profile of the ground along that line. Heights are usually shown on maps by contour lines or spot heights and they give the height above Mean Sea Level (MSL). Suitable site for the project works to be taken up.Ģ. A civil engineer studies the contours and finds out the nature of the ground to identify. 17.5).Ĭontour maps are extremely useful for various engineering works:ġ. If contour lines cross each other, it shows existence of overhanging cliffs or a cave (Fig. If contour lines are meeting in some portion, it shows existence of a vertical cliff (Fig. Contour lines generally do not meet or intersect each other.ġ1. Contour lines with V-shaped with convexity towards higher ground indicate valley (Fig. Contour lines with U-shape with convexity towards lower ground indicate ridge (Fig. Approximately concentric closed contours with increasing values towards centre indicate hills.Ĩ. ![]() Approximately concentric closed contours with decreasing values towards centre (Fig. Irregular contours indicate uneven surface.Ħ. Equally spaced contour indicates uniform slope.ĥ. Closely spaced contour indicates steep ground.Ĥ. Widely spaced contour indicates flat surface.ģ. Contour lines must close, not necessarily in the limits of the plan.Ģ. The contours have the following characteristics:ġ. On contour lines the level of lines is also written. 17.1 shows contours in an area with contour interval of 1 m. The contour lines in an area are drawn keeping difference in elevation of between two consecutive lines constant. Such lines are drawn on the plan of an area after establishing reduced levels of several points in the area. A contour line is a imaginary line which connects points of equal elevation.
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