Our house has always had a marshy backyard. There are no ponds, water pipes or sewers near our backyard. All the water and sewer pipes run out the front of our house. We planted a willow tree hoping to solve the problem, but this year with all the rain we have been getting, the marsh is taking over our yard and encroaching onto the neighbor's yard. About 50 feet by 25 feet. We have been told (not by an expert)that there is a natural spring there. The ground slopes, but the water stays in the one area instead of running off. What can we do on a shoestring budget?