Hank, its not a straight slope at distances of more than a few feet! You cannot double the error from 1000 feet to get the error at 2000 feet.
To begin with over if you are level at the middle, 1000 feet to the left will be down .28 inches and 1000 feet tot he right will be down .28 inches. You have a crown in the middle that is .28 higher than at the ends. To spread water evenly, then you need to raise the ends and the space in between by no more than .28 inches.
If you are level at some point and want to go out 2000 feet to one side then look at my chart that includes 2000 feet... it says the end point error will be about 1.25" low. even though 1000 feet it was only .28" low.
To begin with over if you are level at the middle, 1000 feet to the left will be down .28 inches and 1000 feet tot he right will be down .28 inches. You have a crown in the middle that is .28 higher than at the ends. To spread water evenly, then you need to raise the ends and the space in between by no more than .28 inches.
If you are level at some point and want to go out 2000 feet to one side then look at my chart that includes 2000 feet... it says the end point error will be about 1.25" low. even though 1000 feet it was only .28" low.
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