Why don't immigrants from the South-to-North Water Transfer Project move to cities?

First, most of the immigrants from the South-to-North Water Diversion Project are rural immigrants. Based on the principle of reciprocal resettlement, rural areas should be resettled in rural areas to facilitate the adjustment of production land and solve the living problems of immigrants after relocation. Second, the urban land is limited, and the resettlement needs a large number of construction land and production land for immigrant villages, and the resettlement cost is high. Third, if you move to the city, the living habits of immigrants are different, so it is difficult to adapt in the city, and the cost of daily life in the city is high.