The major principle is that in the beginning, the water, tree planting to absorb water. Global water is water softening so monkey cheeks. The downstream section, digging canals draining into the sea.
The main principle in the upstream part is to planted forests to absorb water. Water is central to retard water cheeks. The drainage canal downstream to the sea.
In principle, namely, in the upstream to reforestation to absorb water. Global water will do plutonium to slow the water. The downstream will dig factorial design into the sea.