Question

sint: Use STAEC Structural and Site Plans Homework 2: Contours, Land Spring 2018 blopes, Bearings & Ground Slope Due: February 22, 2018 Bearings Name: Section: 12 [12 polnts) The instructions br to scalel The elevation at one your calculations in the space provided ons below apply to parts (a), (b), and (c) of this question s comprised of flat rectangular slab(s) as depicted below. Ihe dlibat ower elevations. For each part, complete the following tasks, showing al (1) Re draw the diagram at the given scale; identify the scale on your drawing Find the elevation at all other corners (there are three other corners for part (a), seven other corners for part (b), and five other corners for part (c)) Indicate these elevations on your drawing. Draw contour lines on your diagram at 1 foot contour intervals. (Hint: remember contour lines indicate elevation, NOT horizontal distance. They are also labeled with whole numbers.) Label these on your drawing. t (v) On your drawing, use arrows to indicate the direction of water flow. You would only need one arrow per piece of flat slab. (v) Answer any questions that may accompany the diagram FYI: each diagram is followed by a calculations page, to show your calculations, and a drawing page, to draw your diagram. Round to one decimal place where applicable. (a) Redraw at a scale of 1-40. Show your calculations on next page. 204.8 100' 2.5% 5% 15

Answer 1

" Elevation at D = 204.8^' + (2.5/100) times 100^' = 207.3^' elevation at B = 207.3^' - (5/100) times 210^' = 196.8^' elevation at A = 204.8^' -(5/100) times 210^' = 194.31^' Plotting to 1^' = 40^'' scale side AC = 63^"" BD = 63^"" CD = 30^"" AB = 30^"" Contours are plotted at 1^'.... Interval in elevation For Reference: (To plot contours) Let the point A^' be at elevation 195^' Difference in elevation between A and A^' = 195 - 194.31 = 0.69^' Converting t horizontal distance: 195^' = 194.31^' + 5/100 times (x) = 194.31^' + 0.69^' rightdoublearrow x = 0.69 times 100/5 = 13.8^' converting to scale = 138.8 times 12/40 = 4.14^"" therefore Point A^' is plotted at 4.14^"" from point A on the plot. Similarly, the other points are plotted. Arrow shows the water flow direction. To plot the elevation for other points, first plot A^', B^', C^', C^' points followed by offsets"

arrow shows the water flow direction.

to plot the elevation for other points , first plot A',B',C',D' points followed by offsets so as to make contour plotting easy. after marking the points , join the elevation using smooth curves. i have used Auto CAD.