Detailed Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Q: Context: Three simultaneous waterspouts were observed over Lake Pontchartrain Link Information: Lake Pontchartrain ( ; , ) is a brackish estuary located in southeastern Louisiana in the United States. It covers an area of 630 sqmi Question: What is the square footage of the lake over which three simultaneous waterspouts were observed during the tornado outbreak that began on February 23rd?
A:
Answer: 17563392000