RECENT, HUGE STORMS that swamped drainage systems in Baltimore and elsewhere illustrated two truths:
Flooding can occur even in the midst of a drought.
And storm drains aren't a good place to grow trees.
Baltimore has more than 33,000 storm drains -- known as scuppers -- feeding into 1,000 miles of underground pipes. The city has 10 crews -- of four people each -- assigned to ensure the system is clear, according to the city's public works department. These crews are supposed to clean each scupper twice a year. City officials say their system works.