It's the modern day, somewhere in Europe. Guns are generally difficult get a hold of, and ammunition is not all that plentiful for the average citizen. The cities are death traps, and hordes of thousands, if not tens of thousands of zombies are sweeping the land, looking for their next meal.
Ion just so happens to live close by a 1400's medieval mountain fortress. Although you'd think this would be the first place people would seek shelter in a zombie apocalypse, let's assume that the zombie virus struck terribly quickly, and violently, and only a couple of hundred individuals made it within its walls.
Now, Ion is a practical guy, and he realizes that he's got everything he needs on hand to survive for a long, long time:
The fortress was a tourist attraction, but also kept functional as a military police barracks. Sadly, the vast majority of their equipment (guns, riot gear, ammo, etc.) is gone, but the place is set up to support a few hundred people living there (beds, mess hall, fridges, emergency generators, heating, washrooms, etc.).
There's an armory of medieval weapons on display for the public, and although old, most of the blades, and pole weapons are serviceable. Most of the medieval armor pieces on display are too small, worn, etc. to be used, but a few individuals might be able to armor up for some CQB zombie smashing fun.
We will be ignoring how these people are going to be procuring food, more weapons, etc. Ion has other things on his mind. The moat, though huge, is empty, and he is really worried about all those zombies roaming the land. Eventually they are going to make their way up to the fortress, and although the gates/walls will hold, what happens when the moat fills up?
Note: The moat is dry; there is no source of water to fill it up on demand (only a massive rain/snow melt might do so, and only temporarily).
Not only are the dead bodies going to cause diseases to break out, but the zombies might literally be able to climb over the walls on a ramp made of their brethren's battered remains.
And so, given that:
- There are no construction type vehicles available to dig massive graves, or otherwise empty the moat
- The survivors have some fuel, but not a lot of it (plus, they will need it for the generators)
my question is:
How might the survivors keep the moat from filling up with dead/undead on a day to day basis (say 10-30 new zombies fall in)?
How might they deal with the aftermath of a massive zombie wave which ends up leaving thousands of dead/stuck zombies behind in the moat?