Since I do a river (Upper Mississippi River, Iowa) my way is a bit backwards since it's easier for me to adjust everything down to Flat Pool instead of up to full pool but the basics are the same.
Basically whenever I go out I get a reading from the nearest Lock and Dam and I mark my logs with the place, river level and date. If I'm mapping at a river level of ten feet then I subtract 10 ft from my readings (keeping the original file intact) and put the result in a database or folder. You import that into your map and all your readings will be referenced to the same level When I go back out and use the finished map I just adjust the level up by whatever the river level is that day. Basically the point is to set a reference in your case I guess normal pool is 723. If you map when it is 713 (note it in the log name) then you need to add 10 ft to the data before you add it to the map, if you map when it is 725 then you need to subtract 2 from the data When you use the map you do a similar thing if the pool is at 720 then you need to subtract 3 from the finished map. If you do it right then your sounder depth will be a close match to what the maps says it should be.
Here are some river maps I made in 2011 and 2012 in Dr Depth and they are set for a 5 ft gauge reading, flood stage is 15 ft
