Day 4. 1. Filter Completion

The final prototype of the new debris filter. Jinhwa likes to call it a "half-mushroom" design. Basically, the pipe attached to the joint (90 degree and 4 inch wide) is inserted into the hole. Water is entering from the bottom. It is an improved filter design, but it took almost 2 days for both design and building. 

A completed debris filter in place! The team could not get the top parts bolted in to the dam. However, even with the inner pipe (~3ft) that keeps the filter attached to the dam, the filter should be safe and resistant to natural disturbance such as a flowing rock. It is possible to screw the top parts to the dam now that the new screws are thick enough to expand the anchors inside the holes.

Unfortunately, there is no geology major in team, but we assume that nearby terrain is composed of sedimentary and clay rocks, which would be not so hard to drill a hole. The rock was easily cracked with hammer.