Los Angeles River
The Los Angeles River was originally a free-flowing river, running across a wide basin that would periodically flood. The river would have heavy flows in the winter and spring (rainy season) and little to no flow in the summer and fall (dry season). However, water being forced out of an aquifer below the Los Angeles Basin gave parts of the river an year-round flow. This phenomenon can still be seen today, most notably in a place called Griffith Park where water rises out of the ground and feeds the river.