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Looking Glass River Watershed Management Plan - Greater ...

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Table 5-14 Pesticide: Sources and Causes<br />

Sources<br />

Agricultural Lands<br />

Residential Gardens<br />

Drainage Ditches/Retention Basins<br />

Golf Courses<br />

Mosquito Treatment<br />

Lake <strong>Management</strong><br />

Cause<br />

Pesticide Application<br />

Lack of Buffer<br />

Pesticide Application<br />

Lack of Buffer<br />

Pesticide Application to Reduce Maintenance<br />

Pesticide Application<br />

Lack of Buffer<br />

Pesticide Application<br />

Lack of Buffer<br />

Pesticide Application<br />

Lack of Buffer<br />

Thermal Pollutants<br />

Thermal pollution is waste heat generated from industrial processes which<br />

use water for cooling. The water is returned back into the water system at a<br />

significantly higher temperature, decreasing the dissolved oxygen and<br />

increasing the biological demand for oxygen from organisms.<br />

Changes in temperature, even slight changes, will cause stress to urban<br />

streams and aquatic life. Specifically, increases in temperature result in<br />

changes in migration patterns, increased sensitivity and mortality in fish,<br />

and an increase in metabolic activity producing greater disease and parasite<br />

susceptibility (CWP, March 2003).<br />

Table 5-15 Temperature: Sources and Causes<br />

Photo Courtesy of Tetra Tech,<br />

2005.<br />

Sources<br />

Urban Runoff<br />

Lack of Riparian Buffer<br />

Publicly Owned Treatment Works (POTWs)<br />

and Industrial Discharges<br />

Cause<br />

Impervious Surfaces<br />

Lack of Shade over Drainage and Storage<br />

Facilities<br />

Lack of Shade over Watercourse<br />

<strong>Plan</strong>t Effluent Limits<br />

Poor Design<br />

Poor Maintenance<br />

Other Potential Problems<br />

While woody debris is not technically a pollutant, large amounts of it hinder<br />

recreation such as canoeing in rivers and streams and may indicate bank<br />

erosion problems. Woody debris can also increase the flood stage and<br />

increase flooding on private property. However, woody debris is generally<br />

beneficial to the environment since it provides habitat for fish and<br />

macroinvertebrates which is critical for maintaining a healthy fishery.<br />

Table 5-16 Woody Debris: Sources and Causes<br />

Sources<br />

Dead Fall<br />

Yard Waste Dumping<br />

Wildlife Habitat<br />

Cause<br />

Natural Causes<br />

Flow Fluctuations (see Altered Hydrology)<br />

Clearing by Property Owners (view of river)<br />

Lack of Convenient Disposal Facilities<br />

Natural Causes<br />

Photo Courtesy of Tetra Tech, 2005.<br />

5-22 <strong>Looking</strong> <strong>Glass</strong> <strong>River</strong> <strong>Watershed</strong> April 2007

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