There was a drought in San Andreas, all reservoirs and rivers dried up. Now everything that was on the water lies on land. Expensive yachts, boats, boats lying at the bottom of a once large lake are a pitiful sight, I tell you. Rivers can now be used as off-road roads, crush former algae, and wade through rocks. In general, the mod is interesting, it can diversify the game, allowing you to ride along the bottom of former rivers and lakes.
Installation:
Copy the files Water and Water1 to the GTA San Andreas/data folder.
Updated screenshots and description provided by Adrian Shephard. Modification overview: