If hired by water departments, civil engineers will design irrigation and sewer systems. They will also develop new methods to remove excess water after storms and floods. These civil engineers must also ensure that their water systems do not cause harm to the environment. Civil engineers hired by landfill management companies will design new landfill sites and monitor their operation. When landfills reach maximum capacity, civil engineers will be responsible for sealing the sites and monitoring gas emissions (Kielmas). Civil engineering is a good career as the median annual salary is $83,540, but there are still other fields of engineering that bring in more money (United States). Petroleum engineers are engineers who design methods for extracting oil and gas from underground (“engineers”). They currently have the highest average starting salary of $74,240, which can then grow to $186,520 once sufficient work experience is gained. As current petroleum engineers retire, demand is expected to outstrip the number of people trained to fill available positions.