During the next two weeks, city crews will install dams in eight of
the city’s storm drains and flood control channels to divert urban runoff
during the spring and summer into the county’s water treatment plant in
an effort to prevent pollutants from reaching the ocean.
Of the eight storm drains, two will have permanent dams built in them
while the remaining six will house temporary blocks, said John Pietig,
Laguna Beach’s assistant city manager.
The temporary dams will be removed in October.
“For years past we’ve put [dams] in during mid-April, this week and
next week, and they stay in until mid- to late October and sometimes
[longer],” Pietig said.
Crews will also install five additional treatment and diversion
systems in the coming months that will either allow dry season urban
runoff to flow into the city’s sewer system during the summer months, or
make sure runoff stays in the storm drains when it rains, said Steve May,
the city’s director of public works.
Construction of the five systems may begin in three months, May added.
Each of the five systems costs between $80,000 and $100,000, which
will be paid partly from federal grants for transportation improvement
and capital improvements, May said.
Runoff from residents watering their lawns or from fertilizers
draining down a hillside will be directed into the city’s sewer system
and then be pumped with the rest of the sewage into the coastal treatment
“This prevents pollution from reaching the ocean, causing beach
closures,” Pietig said.
Both the size and material making up a dam vary. The largest dam is 10
feet in diameter inside a channel near City Hall, while others cover 4-
to 6-inch pipes, Pietig said.
Permanent dams are made out of concrete. Temporary dams include
materials from railroad ties to plywood, he added.
The city has more than 50 storm drain outlets.