If your house is at level 4 or higher, you may add a Drainage System to your house. Homes with a constructed drainage system are marked with a special Guild logo in the form of the letter G on the icon. Homes with a drainage system are considered more progressive structures, they are automatically included in the Guild of Builders, all members of which receive additional monetary contributions from the state. Read more
The presence of a drainage system in the house is necessary for the construction of the Dragons' Runways. Read more
Building a drainage system
Table. Cost of building a drainage system
The drainage system is built once for each house, so further elevation of the house will not affect the drainage system, it will remain attached to the house.
Construction of the drainage system takes 192 hours. You can start building in the desired house on the page "Real Estate and Renovation → List of Houses". To speed up construction, you can hire builders, completely similar to what you can do to speed up the construction of a house.
You can monitor the progress of construction on the House List page. The scale shows the progress of construction as a percentage of the total construction time.
The drainage system does not need periodic repairs.