GRID CONTOURING ASSIGNMENT On the upper area of the grid on the next page, 1m contours are drawn. In the lower area, the number shown is t

GRID CONTOURING ASSIGNMENT On the upper area of the grid on the next page, 1m contours are drawn. In the lower area, the number shown is the R.L. of the land at the corner of the grid next to the number. Every RL is precise to two decimal places i.e. every final zero has been deleted for clarity. (e.g. 15.4 means 15.40)Each grid square represents 33m x 33m.

(1 Marks) Make measurements of the grid squares and find the scale of the plan that you have printed. Quote the scale to the nearest 10 i.e. 1 : X,XX0.

Distance on Plan (mm) Distance on Ground (m) PLAN SCALE

SCALE ADOPTED BY YOU

What are the lengths of the lines a-a and b-b on the ground? Marks will be awarded/deducted for both the accuracy and precision of your answers. You may comment, if you wish, on the number of significant figures you have chosen to use in your answer.

a-a m b-b .... m

What is the average grade of lines a-a and b-b? a-a .. b-b

In the bottom area of the grid, draw and label contours at 1m intervals. Please interpolate mathematically along the grid lines. Part of a contour has been drawn showing an interpolated point, as a guide for you. Complete this contour and then draw and label the other contours on the plan.

On a separate page of A4 paper, (squared paper is acceptable) use the data shown by the contour plan to draw the longsection of the line from X to Y. (You may not need all the lines below.)

The horizontal scale must be 1:1,000 and the vertical scale must be 1:100.

R.L. Distance on plan (mm) Distance in m (round to 1m for plotting)

X 0 0

A farm dam is to be built at the line marked DAM. Its catchment area has been drawn on the plan and is shown by the lightly dashed lines. Draw give and take lines and use them to calculate the area of this catchment. On your plan, show the give and take lines you use and the lines you have used to calculate the area by regular figures. Also please mark their ground lengths on your plan. Please show you working on the bottom of the assignment or on a separate sheet of paper.

Area . m 2

The area of land marked KLMN, which measures 33m x 16.5m, is to be levelled to RL 17.45 to create a horizontal surface for farm sheds and buildings. Calculate how much soil will be left over (excess cut), or needed to be added (fill), if all the sides of the final surface will be vertical. Use the spot levels to find the Natural Surface RLs (to 2 decimal places) of points K, L, M and N.

POINT Natural Surface RL Final RL Depth of Cut (-) / Fill (+)

K

L

M

N

Volume . m3 RESIDUAL SOIL (CUT) / NEEDED TO BE ADDED (FILL)