The best time to plant your corn seeds is when the soil temperature reaches an average of 50 degrees Fahrenheit. You can determine the average ground temperature in your garden using a soil thermometer -- available at most garden stores.
Vents are a major component in a home's drainage system. Venting allows water to pass out of the drains easily. Today, houses are vented through the roof. Roof flashing, made from heavy grade rubber, lead or sheet metal holds the vent pipe in place. Another thing to consider is pitch.
Floor drains are built with a trap that is designed to be filled with water in order to block sewer/methane gases from venting upward. Whether the drain has a pitch or a p trap, this trap can dry out allowing sewer odors to travel back up the piping into the air we breathe, and smell.