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Grading Plan Reading Question

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Old 04-30-2019, 11:32 AM   #1
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Grading Plan Reading Question

Newbie question. How was the starting elevation of 9XX.xx determined?

Also Iím assuming this measurement is expressed in ft. ?

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Old 04-30-2019, 12:34 PM   #2
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Re: Grading Plan Reading Question

Site survey.


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Old 04-30-2019, 12:56 PM   #3
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Re: Grading Plan Reading Question

Somewhere on that set of plans, should be a benchmark, marked BM.

It'll have a number next to it, my guess is 900.00

And yes, feet and tenths/hundredths.

Why they started with 900, I have no idea.

Most everyone in my area marks the BM at 100, regardless of elevation above sea level.
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Old 04-30-2019, 12:59 PM   #4
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Re: Grading Plan Reading Question

That would be the height above sea level. How they determine that I don't kow.
I don't know why they still do it that way etiher.
I would think that starting at some 0 point like the first floor level would be easier to undsrstand but just do the math I guess.

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Old 04-30-2019, 01:41 PM   #5
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Re: Grading Plan Reading Question

Around here it usually is sea level as benchmark. From what I've seen anyway. What gets confusing for a noob is converting tenths of feet to inches.
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Old 04-30-2019, 05:30 PM   #6
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Re: Grading Plan Reading Question

Modern survey equipment reads height above sea level very accurately. Even some of the hand held GPS trekking units will give you a rough number.

It's all relative to a benchmark, or absolute to see level, or possibly to a datum set somewhere.


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