GRID CONTOURING ASSIGNMEN.GRID CONTOURING ASSIGNMENT

NAME $......$

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$.15\mathrm{.}4$ means $15\mathrm{.}40)$

Each grid square represents $38m38m.$

$(1$ 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$.1$:$x,xx0.$

SCALE ADOPTED BY YOU

$(2$ Marks$)$ 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

$m$

$(1$ Mark$)$ What is the average grade of lines $a-$a and $b-b?a-a........$

b$-$b

$(4$ Marks$)$ 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.

$(4$ Marks$)$ On a separate page of A$4$ 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 $1$:$100.$

$(4$ Marks$)$ 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

$1^2$

$(4$ Marks$)$ The area of land marked KLMN$,$ which measures $38m14\mathrm{.}0m,$ is to be levelled to RL

$17\mathrm{.}66$ 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$.$ Assume

that the spot levels at these points are precise to TWO $(2)$ decimal places e$.$g$.19\mathrm{.}60.$