Knee pain and popping is a common problem and can be caused by a number of factors. Another term commonly used for popping in the knee is Crepitus, which essentially means a noisy joint, whether it be popping, clicking, cracking or snapping.
The final type of erosion is attrition. Attrition is a way of eroding the riverâs load, not the bed and banks. Attrition is where pieces of rock in the riverâs load knock together, breaking chunks of rock off of one another and gradually rounding and shrinking the load.
1 Water spurts in the space between sprinkler heads - indicating a broken pipe (lateral line) that has already blown out the soil above it.  Flooded areas between sprinklers - can indicate a slow, steady leak in a lateral line underground. You will have to dig down to find the actual spot.