I am starting changeover soon. it will be diy because contractor price was more than i could afford @ approx. $15000 for 3 -500ft loops installed. i live on the water where a river meets the ocean, approx.6-8 ft above high water level. would it be wise to dig deep enough to allow water into trenchs? water is ice-covered 5-6weeks a year. if it is reasonable,instead of three trenchs should i go with one wide trench with out pipes on the bottom and return two feet above and how wide should trench be? any input would be appreciated. thanks.