Which type of logical fallacy does edward abbey use? eventually, as is already sometimes the case at lake mead, the stagnant waters will become too foul even for swimming. the trouble is that while some boats have what are called "self–contained" heads, the majority do not; most sewage is disposed of by simply pumping it into the water. it will take a while, but long before it becomes a solid mass of mud lake powell ("jewel of the colorado") will enjoy a passing fame as the biggest sewage lagoon in the american southwest. a. post hoc ergo propter hoc b. ad hominem c. slippery slope d. non sequitur