Thanks for posting this scene file. Had to play with it some.
I changed it a little, trying to make the water paths more obvious but I'm 
not sure I succeeded.
All I did was add a texture layer onto the "bordo" going from dark to clear 
for a wet concrete-look, also added exponent 0.67 to the water reflection to 
darken that.

Image attached, without grass.
#declare t_bordo=texture {
	pigment {
		granite
		color_map {
			[0.0 rgbft <0.7,0.7,0.7,0,0>]
			[0.2 rgbft <0.7,0.7,0.7,0,0>]
			[0.3 rgb <0.9, 0.8, 0.7>]
			[0.5 rgbft <1,1,1,0,0>]
			[1.0 rgbft <1,1,1,0,0>]
		}
		turbulence 0.5
		scale 1.2
	}
	}
	texture {
	pigment {
        	gradient y
		color_map {
			[0.0 rgbf 1/5]
			[0.525 rgbf 1/4]
			[0.55 rgbft <0.25,0.25,0.25,0.5,0.5>]
			[0.575 rgbft <0,0,0,1,1>]
			[1.0 rgbft 1]
		}
		scale 50
	}
	normal {
		granite
		turbulence 0.5
	    slope_map {
	        [ 0.0    <1,0> ]
	        [ 0.6    <1,0> ]
	        [ 0.6    <1,-1> ]
	        [ 1.0    <0,0> ]
	    }
		scale 1.2
	}
	scale 0.01
}

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Download 'test_truchet_21-waterchange.jpg' (92 KB)

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