I planted about 6500 of them on my sloped property to protect against erosion.  I was just curious how you were using them.  I didn't know about water channels.  what purpose does it serve? strictly for erosion or are you using the water? 

 It's essentially diverting a seasonal creek to a less productive area of my land.

I would have done things differently with hindsight but I found vetiver after I dug it all out. 

 that's a great idea, better than concrete