Description:
In the old days of Skyrim (aka Oldrim), there was no real water flow, only strictly animated one existed.
Since Special Edition is released, simulated water flow is added as a new feature, but lots of Oldrim mods are missing in that part.
This SSEEdit script patches converted Oldrim mods and some Special Edition mods to enable the feature.

Requirements:
SSEEdit http://www.nexusmods.com/skyrimspecialedition/mods/164/
(Not necessary, but optional) Unofficial Skyrim Special Edition Patch http://www.nexusmods.com/skyrimspecialedition/mods/266/

Usage:

Thanks to Tooneyman for tutorial video
1. Unpack archive into SSEEdit Install Folder\Edit Scripts
2. Load ESPs in SSEEdit with Update.esm
3. Select ESPs that you want to fix by Shift+Click, CTRL+Click, Click and drag mouse over files, by whichever method you prefer
4. Right click -> Apply Script
5. Select __fix waterflow for Oldrim mods to directly edit ESPs, select _make a patch file for waterflow for Oldrim mods to generate a new ESP.
6. Click OK
7. Save when exiting
8. (Optional) Make sure new ESP is loaded below original ESPs if you chose make a patch option.

Note:
I personally recommend directly editing individual ESPs by using _fix waterflow script, because not only it doesn't add extra ESP to load, sometimes undesired record edits are carried over to the patch file from individual ESPs, thus rendering load order of mods useless.

Credits:
SSEEdit Team