I am thinking about helping someone build 1 or 2 relatively small ponds to be used primarily for wildlife watering. The soil in this area is generally very conducive to pond construction, being of high clay content. Can a couple of weekend warriors make a go of it by simply pushing some dirt around and backing up a ditch or two? I would anticipate installing some sort of drainage pipe to provide runoff relief. Does the bottom of a ditch need to be sealed or packed with clay? Any advice or help would be appreciated, thanks.