a$)$ A GRID system is being used to conduct a detailed survey. Assume that a ground of dimensions $4025$ m is being surveyed. Draw the grid lines to conduct this survey

b$)$ The booking sheet of a GRID survey has readings as given below.

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$$ The spot heights at the grid intersection points have been calculated and are provided in the grid below.$$

$$ Identify at least five points on the grid through which the contour line $100\mathrm{.}600$ will pass.

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c$)$ The following data is given.

$$ i$.$ Higher contour is $100\mathrm{.}830$

$$ ii$.$ Lower contour is $100\mathrm{.}580$

$$ iii.$$ Distance from higher contour to grid is $24$ mm

$$ iv$.$ Distance between contours is $34$ mm