How a Rip Current Forms When Water Mixes

The green water at this creek mouth occurs when the ocean water mixes with Urban Runoff. This is a phenomenon that happens when tide cycles and large waves fill up the mouth of a creek. When the water finally starts to spill over the sand dam, it creates rapid waves that lead to large amounts of water flowing in to the ocean. This can create dangerous waves and currents right in the surf zone of the beach.