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| Titel |
Reconstructing the natural hydrology of the San Francisco Bay–Delta watershed |
| VerfasserIn |
P. Fox, P. H. Hutton, D. J. Howes, A. J. Draper, L. Sears |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 10 ; Nr. 19, no. 10 (2015-10-22), S.4257-4274 |
| Datensatznummer |
250120831
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| Publikation (Nr.) |
 copernicus.org/hess-19-4257-2015.pdf |
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| Zusammenfassung |
We evaluated the impact of landscape changes on the amount of delta outflow
reaching San Francisco Bay. The natural landscape was reconstructed and
water balances were used to estimate the long-term annual average delta
outflow that would have occurred under natural landscape conditions if the
climate from 1922 to 2009 were to repeat itself. These outflows are referred to as
natural delta outflows and are the first published estimate of natural
delta outflow. These natural delta outflows were then compared with
current delta outflows for the same climate and existing landscape,
including its re-engineered system of reservoirs, canals, aqueducts, and
pumping plants.
This analysis shows that the long-term, annual average delta outflow under
current conditions is consistent with outflow under natural landscape
conditions. The amount of water currently used by farms, cities, and others
is about equal to the amount of water formerly used by native vegetation.
Development of water resources in California's Central Valley transferred
water formerly used by native vegetation to new beneficial uses without
substantially reducing the long-term annual average supply to the San
Francisco Bay–Delta estuary. Based on this finding, it is unlikely that
observed declines in native freshwater aquatic species are the result of
annual average delta outflow reductions. |
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