I've been keeping an eye on the small weir and so far so good. It has backed up quite a bit of clay and sand since being installed and the sides are holding up fine. During big rains the water tops that weir and flows over instead of pounding the steep bank. The v-notch allows quite a bit of flow during moderate rain events.
Here is the 2nd weir so far
I still need to add 5 more cinder blocks, 25 bricks, and ~300lbs of rock just to the front side. The backside of the weir will need around 500lbs of rock total. We have managed to filter about 60% of the incoming flow at current state.
