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Dayflow

Published by California Department of Water Resources | State of California | Catalog Last Checked: October 24, 2026 at 08:44 PM | Dataset Last Updated: September 25, 2026 at 08:35 PM
Dayflow is a computer program developed in 1978 as an accounting tool for determining historical Delta boundary hydrology. It presently provides the best estimate of historical mean daily flows: (1) through the Delta Cross Channel and Georgiana Slough; (2) past Jersey Point; and (3) past Chipps Island to San Francisco Bay (net Delta outflow). The degree of accuracy of Dayflow output is affected by the Dayflow computational scheme and the accuracy and limitations of the input data. The input data include the principal Delta stream inflows, Delta precipitation, Delta exports, and Delta gross channel depletions. Both monitored and estimated values are included as described in this Dayflow program documentation. Currently, flows are not routed to account for travel time through the Delta. All calculations involving inflows, depletions, transfers, exports, and outflow are performed using data for the same day. All Dayflow summary reports distributed through January 1985, providing flow data through August 1984, and data for September 1984 reported herein were generated according to the algorithm described in the Computational Scheme section.

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Complete Metadata
@type dcat:Dataset
accessLevel public
contactPoint 
{
  "fn": "Jeff Galef",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:jeff.galef@water.ca.gov"
}
description Dayflow is a computer program developed in 1978 as an accounting tool for determining historical Delta boundary hydrology. It presently provides the best estimate of historical mean daily flows: (1) through the Delta Cross Channel and Georgiana Slough; (2) past Jersey Point; and (3) past Chipps Island to San Francisco Bay (net Delta outflow). The degree of accuracy of Dayflow output is affected by the Dayflow computational scheme and the accuracy and limitations of the input data. The input data include the principal Delta stream inflows, Delta precipitation, Delta exports, and Delta gross channel depletions. Both monitored and estimated values are included as described in this Dayflow program documentation. Currently, flows are not routed to account for travel time through the Delta. All calculations involving inflows, depletions, transfers, exports, and outflow are performed using data for the same day. All Dayflow summary reports distributed through January 1985, providing flow data through August 1984, and data for September 1984 reported herein were generated according to the algorithm described in the Computational Scheme section.
distribution 
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  }
]
identifier 2121f526-a523-4f73-a2ac-34408acce805
issued 2019-08-20T17:36:22.212039
keyword 
[
  "Delta",
  "Flow",
  "NDOI",
  "Sacramento Delta",
  "X2",
  "california department of water resources"
]
modified 2026-09-25T20:35:21.164908
publisher 
{
  "name": "California Department of Water Resources",
  "@type": "org:Organization"
}
theme 
[
  "Natural Resources",
  "Water"
]
title Dayflow

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