There could be some issues if those storm drains enter the retention pond down low, at the base or bottom of the pond itself.
One of our retention ponds has two 3' culverts coming into it, and they are both at grade with the pond bottom.
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."
