0 Flaps
Not sure if you are reading a genuine De Haviland AOM or a company altered one. Flaps and nose wheel steering are on one hydraulic system and brakes are on another, for obvious reasons. ie crappy day if you lost everything. On wheels, intermediate and tundra tyres, ski's and Whipline floats, flapless landings are an abnormal landing and just call for a higher calculated Vref based on the weight of the aircraft. Not really practiced, except in training. The de havilland wing is a remarkable thing and flapless landings are easily accomplished.
CAP (the canadian) floats on the other hand which are a very good performer in all conditions call for attitudes for landing similar to a hull ie (flying boat) and the "sweet spot" is a larger area with more flap and a slower speed than a less flap arrival. They are the most difficult config to learn, but very rewarding when you do so. But with a flapless landing on them, the ideal conditions are not rough nor glassy water but into wind, and both engines operating for maximum reverse. V ref is around 110 aposed to 70. And a sweet spot area of too nose low to too high of less than an inch of attitude. A challenge. And not practiced because of the risk of f#cking it up.