How urbanization impacts hydrology

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Information about How urbanization impacts hydrology
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Published on February 22, 2014

Author: catch2water

Source: slideshare.net

Description

A conceptual depiction of pre and post urbanization hydrological processes

How is urbanization impacting our water bodies A conceptual depiction Catch2water.blogspot.in

Forested Catchment Forested Catchment River WATER TABLE

WATER TABLE

Precipitation is slowed down, helps infiltration Undergrowth Humus Runoff slows down Precipitation does not exceed infiltration Precipitation does not exceed infiltration WATER TABLE IS RECHARGED

Precipitation is slowed down, helps infiltration Undergrowth Humus Runoff slows down Soil pores gradually fill up helping infiltration Soil pores fill up much more slowly and infiltration continues WATER TABLE IS RECHARGED

Undergrowth Humus Runoff Runoff slows down Soil pores fill up and runoff is generated Soil pores fill up much more slowly and infiltration continues WATER TABLE IS RECHARGED

Moderate Runoff generation Moderate Runoff generation Higher ground water recharge which gradually flows towards the water body WATER TABLE Higher ground water recharge which gradually flows towards the water body

GRADUAL RISE IN RIVER Moderate Runoff generation Higher ground water recharge which gradually flows towards the water body Moderate Runoff generation Higher ground water recharge which gradually flows towards the water body WATER TABLE

Maintains base flow in River even during summers Subsurface water gradually flows towards the water body even months after rains Subsurface water gradually flows towards the water body even months after rains WATER TABLE

URBANIZED SCENARIO TREE COVER IS REMOVED WATER TABLE

WATER TABLE

Undergrowth is removed Soil compacted, covered with roads, pavements Deep pumps drain out water and reduce the water table WATER TABLE IS DEPLETED

Almost Immediate runoff generation Limited percolation Limited infiltration Limited water table recharge

High runoff and artificial drainage from the city High runoff and artificial drainage from the city Low ground Water flow WATER TABLE Low ground Water flow

Low ground Water flow High runoff and artificial drainage from the city leads to sudden swelling of river and flooding WATER TABLE Low ground Water flow

Low ground Water flow The runoff drains faster and lesser water is left in the river WATER TABLE Low ground Water flow

Low ground Water flow With no groundwater flow to recharge the river in summers, the river dries out WATER TABLE Low ground Water flow

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