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<blockquote data-quote="Allen" data-source="post: 220602" data-attributes="member: 389">Dean is correct, those are the current numbers for what stage is expected for a given CFS (cubic feet per second).&nbsp; Actually, they are the result of an equation that roughly is in the form of y=mx+b (y=flow, m=slope, and b is a constant that gets updated as needed).&nbsp; Bottom line is the USGS has a gage in place to physically measure the water level and then several times through the year they come out and physically measure the actual flow in the river to update the database used to create the equation.- - - Updated - - -Yes, to obtain a value for above Mean Sea Level (MSL), you will want to add 1,619.6 to arrive at an elevation using the North American Vertical Datum of 1988 (aka NAVD-88).&nbsp; The other really common zero datum people use is 1,618.28 in the older National Geodetic Vertical Datum of 1929 (aka NGVD-29).&nbsp; You must know which datum your surveyor is using for a particular location in Bismarck in order to properly arrive at how far above the water your point of interest is at any given point in time.</blockquote>

[QUOTE="Allen, post: 220602, member: 389"] Dean is correct, those are the current numbers for what stage is expected for a given CFS (cubic feet per second). Actually, they are the result of an equation that roughly is in the form of y=mx+b (y=flow, m=slope, and b is a constant that gets updated as needed). Bottom line is the USGS has a gage in place to physically measure the water level and then several times through the year they come out and physically measure the actual flow in the river to update the database used to create the equation. [COLOR="silver"][SIZE=1]- - - Updated - - -[/SIZE][/COLOR] Yes, to obtain a value for above Mean Sea Level (MSL), you will want to add 1,619.6 to arrive at an elevation using the North American Vertical Datum of 1988 (aka NAVD-88). The other really common zero datum people use is 1,618.28 in the older National Geodetic Vertical Datum of 1929 (aka NGVD-29). You must know which datum your surveyor is using for a particular location in Bismarck in order to properly arrive at how far above the water your point of interest is at any given point in time. [/QUOTE]

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