What s the Sumerian way of irrigation and writing?

Summerian writing is very important in the history of the world, as it it possibly the first writing system ever: Cuneiform. Cuneiform was composed of lines with triangles at the end, which was influenced by the medium of their writing: a clay tablet.

The summerian irrigation was also a first (or one of the first). The system was based on digging a hole in a river's bank and then filling it in when needed.