With flat, staggered river network and other features of plain river network, with a source of drinking water, shipping, pollutant and other functions.
The plain river network area, characterized by flat terrain and interlaced river network, has the functions of drinking water source, shipping, pollution and so on.
The plain river network area, characterized by flat terrain and crisscross river network, has the functions of drinking water source, shipping, and receiving pollution.<br>