Water preset

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Create/Edit Water Preset

This window can be accessed by going to the top menu bar and selecting World -> Environment Editor -> Water Presets -> New preset or Edit Preset (If you Edit an existing preset, you can save it with a new name, thus creating a new one). The windows are almost the same, except that in Edit mode, you select an exiting preset to modify, while in Create mode, you supply a new name to use and start out with default values.

Fog and Wave Tab

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Water Fog Color: Opens the Color Picker so you can change how underwater fog appears.
Normal Map: Opens the texture picker so you can set what Normal Map is layered across the water to determine reflections and refractions. A normal map is a specially-prepared image to simulate depth, but you can use any texture here.
Fog Density Exponent: Controls how dense the water fog is and how far you can see underwater. Has no underwater effect when Underwater Fog Modifier is 0.00.
Underwater Fog Modifier: Boosts or lessens Fog Density Exponent when you arere underwater. Has no effect on the water's surface.
Big Wave Direction: Controls where and how fast the large-scaled version of the normal map moves in the X and Y directions.
Little Wave Direction: Controls where and how fast the the small-scaled version of the normal map moves in the X and Y directions.
Make this preset my new water setting: Applies the WL preset.

Reflection

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Reflection Wavelet Scale: Controls the scaling of the three wavelets that make up the water. Changes may be subtle and are easier to see with low Fresnel Scale settings.
Fresnel Scale: Controls how much light is reflected at different angles. See this page for more information.
Fresnel Offset: Controls how much light intensity is reflected.
Refract Scale Above: Controls how much light is refracted from looking above the surface of the water.
Refract Scale Below: Controls how much light is refracted from looking from below the surface of the water.
Blur Multiplier: Controls how waves and reflections are mixed. Higher values appear brighter.
Make this preset my new water setting: Applies the WL preset.

From Water Presets