Water Everywhere

Water Everywhere (HMG75)

Location: Sunnyvale, CA 94089 Santa Clara County
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Country: United States of America
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N 37° 25.807', W 121° 58.784'

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Water Seeks Its Own Level

Water in Alviso is a complex issue that touches on the environment, economics, and life safety. Already susceptible to flooding, Alviso's situation was worsened by regional development. Hard paving, which prevented water absorption into the ground, and increased groundwater pumping caused the water table to drop. As a result, the land subsided, and Alviso dropped 13 feet over the last 100 years. Situated below sea level, it became even more vulnerable to flooding.

More recently, Alviso also experienced the extreme of no water. Suburban and industrial growth and salt pond construction silted in or closed off much of Alviso's waterways. This drastically altered the amount of water that naturally flushed this wetland area, endangering the region's environmental health.

The re-channeling of the Guadalupe River and the outflow from the nearby sewage treatment plant have also impacted the level, flow, and quality of water in Alviso.

[Text of Timeline Aerial Photos:]
Development has changed the Alviso area in the fifty-year span of the photographs above. Salt ponds, development, and the resulting siltation have filled in the shoreline and blocked many waterways. To aid flood control, the course of the Guadalupe River has been straightened and channelized.

Aerial photo Above: Courtesy of Pacific Aerial Survey.
Details
HM NumberHMG75
Series This marker is part of the Juan Bautista de Anza National Historic Trail series
Tags
Placed BySanta Clara County Parks and the Santa Clara Valley Water District
Marker ConditionNo reports yet
Date Added Sunday, September 21st, 2014 at 7:47am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10S E 590266 N 4143076
Decimal Degrees37.43011667, -121.97973333
Degrees and Decimal MinutesN 37° 25.807', W 121° 58.784'
Degrees, Minutes and Seconds37° 25' 48.42" N, 121° 58' 47.04" W
Driving DirectionsGoogle Maps
Area Code(s)408, 650
Closest Postal AddressAt or near 490 Mills St, Sunnyvale CA 94089, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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