So I had a lot of time off from making this map and after a long thought I decided to remake the map... So now its 8p. there is a lot more changes to come stay tuned!
Images below real life v ingame. Btw the Air Photos were taken after the flooded had cleared
Using more than 2 water sources, will make your maps optimization a lot worse for low-mid or even high end PC's. The games might become really laggy, its because every water source you make on the map, will render twice which takes up even more RAM from a game that already eats your 8GB like it was nothing. My suggestion is to connect 1-2 water source out of the boundaries, where the player wont see it (OOB area), if you do this before you proceed, will cut you a lot of headache later.
OnkleSam's map "crossing in the woods"- river is connected outside of the playing area so its actually only 1 water source used. And Relic uses it as well on their maps.