The windy season is mid-October - end-June.
The most common wind at Salamansa is 16-17 knots at the kite center and 17-18 knots at the upwind wave area. There are other spots with more wind on the island but they are not as safe (only for advanced riders with safety boat).
The wind bows all day (& drops a tiny bit during the night)
The wind comes mostly from NNE mid-October - end-November and again beginning May - end-June.
The wind comes mostly from NE beginning-December - end-April.
Both directions work well at Salamansa bay on Sao Vicente.
The reef breaks are over a reef. The lowest depth underneath the wave depends on where you take the wave and on how big the waves are on the day. If you take the wave all the way on the right (tallest part of the wave), this will be the most shallow part (only pros do this). If you want to play it safe, you don't go all the way to the right so you won't get hurt when something goes wrong. On days with big waves, the water is deeper.
The beach breaks are over sand (without any stones).
Below picture of the Salamansa flat water area on a relatively calm day (NOTE: it's not a big area)
Unlike the main beach downwind, this are has black sand.
Below a picture of the reef break with small waves (on a day with big waves).
NOTE: water looks shallow but it is not (water is extremely clear)
Below a picture of the reef break with small waves (on a day with big waves - slightly smaller).
Sorry, I don't have picture of a typical day of the reef break with small waves (doesn't look as spectacular