I like the Idea of this wonder, because there are no real great engi. wonders early in the game. However i think this is too OP. So let me do my take on this wonder here in absolute respect towards you C :)

Dude i love the model you designed so i felt the need to give a detailed critique here :)
Hope you read it and think about it, maybe make a normal version and a nerved version fi you like my ideas :)

Nerfs i would do if i wanted to balances this:
- Engipoints down from 2 to 1
- Culture down from 2 to 1 (early culture sources can get to powerfull very quick)
- Only unlocks dams with pottery NOT aqueducts, because aqueducts are TOO strong this early.
- Jade Cong should only give 1-2 Amenities to make it balanced AT ALL ^^ Also make them pop only on dams, because you have to dig in the earth when building dams :D. Would also motivate players to build risky cities on rivertiles to use this wonder.
Right now it gives basically free +12 Amenities with every city xD thats too strong ^^

Buffs i would add to make this thing competitive/balanced:
- remove the general district bonus to aqueducts/dams and add the suggestion below:
- City with L.-City inside its borders gains 20 % production towards Industrial Zone and its buildings.
- All cities of the owner of L.-City gain 10 % production towards Industrial Zone and its buildings.

Civilisations with a special industrial Zone like all german leaders or for example Ambiorix would find this wonders pretty interesing now without making it too strong. (maybe make it a favorite of such civs as AIs)