Topography
Find elevation on topography: The elevation on the two Contours are 60 and 55 ft the interval is 16 ft. What is the elevation 4 ft away from contour 55
60-55 = 5 ft elevation difference in 16 ft
4 ft is 25% of the distance (4/16)
5 (4/16) = 1.25 ft + 55 ft = 56.25 ft elevation
Slope: (Contour 1- contour 2)/ change in interval= V/H= G = 245-230/5 = 3:1
Topography: Land layout and Site Slope are critical in evaluating site worth and applicability. Cut and fill costs are not cheap.
Topography critical for routing storm water (natural slope)
not water, electric/ gas
Contour lines: Spaced @ given horizontal intervals show elevation of location_ terrain. Continuous elevation lines with equal elevation lines. Dashed lines are existing or natural topography. Solid lines: New modified contour lines. Lines never split and are always same elevations.
Contour lines: In building design: To minimize grading, buildings are designed in parallel to match hill side contour lines.
Contour lines: 5% grade, interval is 1 ft, G = V/H= 5/100= 1 ft/h= > H= 20 ft.
Highly irregular contour lines: Most appropriate for cluster type residential development. Concentrated grouping of residential space in open areas through clusters. Cluster was to condense large number of units. Lengths of street reduced, high roads, and moderate slopes.
Uniform slope: When spacing between contours is equal
Valley: When contours elevation increase outward
Ridge: Increase outward
Steep: When contour lines are close together
Topographic map includes: Property line, easements, and utilities, location of streams, roads, and buildings- Not shown: Soil conditions
Slope of land: Required for sanitary and sewer/storm. Slope is not required for gas, water, or electric
Arial photograph: Terrain conditions, nothing to do with sub-terrain
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