We also have large lakes in the area and the ducks don't care if they find something to eat at your place.
I have been able to observe a system for years.
The smaller the water, the greater the success
Daily(as often as it is possible for you), feed with corn for example, wheat or barley, in the morning, possibly build food flow or several.
Before you feed send the dogs in and drive away all the ducks from the reed,important!!.They will eat their fill and disappear to the big lakes for resting..
The grain is quite expensive but the ducks and the hunt will thank you.
Don't hunt often,rest by the water and hunt hard from time to time (i know you have quotas)
Only hunt on the evening,do not let the dogs into the water until the hunt is over.
In our place was not shot one duck(as well as), since the concession neighbor uses this system, now 300 a year !!
Waidmannsheil and good luck.
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or so,you dont need a larger water.Ducks eat like elephants
Feed them and you have it.
The laws are somewhat different in NA. Putting out food for ducks and shooting over it is likely to result in a hefty fine. Planting food for them is fine as long as you do t do anything g to disperse the grain (like bush hogging).