Other: There is some sort of storm drain cover between 718 and 706 University that flips over if you step on it. I was walking down the sidewalk on the north side of the street and had to walk on the grass to avoid low hanging trees (that really need to be trimmed). I stepped on the cover and it flipped and I fell into it up to my knee, causing several serious scrapes on my leg. It is very dangerous! I was hurt so I didn't take note of the exact address, but it's on the patch of grass between the sidewalk and the street, and the low-hanging trees make it impossible to walk down the sidewalk - more people are going to fall in it. Please fix it so it doesn't flip - it was a very scary and painful experience!