Question is there any way for anybody to find out a cause of a sink hole in a swale next to a drain basin? The swale comes from both directions between houses with the drain being in the swale behind our house.Our yard was regraded about 3 years ago form being a sledding area to a more gradual slope. this neighborhood is 7 year new construction. This is a high indecent sink hole area, also this year we have received over 400% normal rain for the area, and an earthquake happened the week before in Sept(Virginia felt here)the sink hole opened in September that time more than 45 sink holes opened up in our township! so I was wondering why anyone would thin that somebody was responsible for causing the sink hole.