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Increase Arable Land

Updated for 1.9. I tested it briefly, let me know of any issues.

Survey for and construct canals to increase the arable land in your state by 40 or 80. It uses a similar system as the construction of skyscrapers in vanilla.

First, the state you want to build the canal network in needs to be set as the survey site using the button on the state panel. (This mod won't be compatible with mods that change the state panel unless loaded after those mods) The survey site can be moved by removing from the state using the remove site button. If multiple states are chosen as survey sites, a random state will be chosen.

Second, take the decision to survey for the canal network (requires the first canal tech - in the society tab on the left). The base decision costs 300 bureaucracy a week, with the advanced costing 600 (requires second canal tech). After 12 months (11 month ticks) the state will be identified as a construction site.

Third, construct (or expand) the canal network building in the state (it can only be built in the recently surveyed state).

Once constructed an event will trigger that expands the arable land in the state by 40 with the base decision and 80 with the improved decision. If the state is split, the new arable land will be split as well.

One note, once there is at least 1 canal network in the state, the journal entry for constructing the canal network will autocomplete after 50 weeks, if you have not started construction of the canal network in that state. This will give you the bonus arable land, but you won't get the benefits from canal network building, which are pretty good. The issues comes from my inability to make an on_action work for a specific building being expanded.

See my other playing tall mods here: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3043249817