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Introduction How Rivers Run Stories Value Of A River What We Can Do
Connections of a River - Connectivity
Vertical disconnects (pg 4 of 7)

The construction of highways, parking lots, and other large impervious surfaces is often considered a hydrologic problem, speeding the flow of runoff into nearby waterways. And it is. But it is also a vertical disconnect, blocking the flow of water into the ground, where it would enter underground aquifers and some would eventually reach a nearby river.

Precipitation can no longer slowly percolate through the soil profile to recharge aquifers. Instead, water is rerouted into storm sewers and water bodies at higher volumes and faster rates. Runoff from storm sewers and other urban collectors carries materials and toxins that pollute the river with chemicals and nutrients. This, in turn, impacts dissolved oxygen levels and temperature regimes that, in turn, disrupt fish and wildlife habitat and nutrient cycles.


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