
Related Links
Environmental Planning and Information Branch
Dayflow Program
3500 Industrial Blvd.
West Sacramento, CA 95691
(916) 376-9728
Email: mkoller@water.ca.gov
Mailing Address:
P.O. Box 942836
Sacramento, CA 94236-0001

The Dayflow Documentation has been modified over the years as the computational scheme has changed to reflect conditions and data. The original Dayflow Documentation contains the computational scheme that was used to back-calculate the 1930-1956 Dayflow output. The 1986 Dayflow documentation guided Dayflow estimates until 1996. The full Dayflow Documentation describes the computational scheme used for the current releases of all Dayflow output. Dayflow output between 1956 and present is calculated based on the current documentation. Some Dayflow Parameters are observed data, which are not calculated by Dayflow. Dayflow input station maps lists these parameters.
Summaries of annual Dayflow output highlights and modifications are presented annually in the IEP Newsletter. The same summaries are archived on the Dayflow Data Through Water Year 2014.
The following link provides quick access to all Dayflow parameters:
Observed Data Parameters
- Net Delta Outflow Index (NDOI) At Chipps Island (QOUT) (compare NDO vs NDOI)
- Total Delta Inflow (QTOT)
- Eastern Delta Inflow(QEAST)
- Miscellaneous Stream Flow (QMISC)
- Yolo Bypass Addition to the Delta Water Balance (QYOLO)
- Delta Precipitation Runoff Estimate (QPREC)
- Deltawide Gross Channel Depletion Estimate (QGCD)
- Net Channel Depletion (QCD)
- Total Delta Exports and Diversions/Transfers (QEXPORTS)
- Export⁄Inflow Ratio (EXPIN)
Interior Delta Flow Estimates
- Delta Cross Channel and Georgiana Slough Flow Estimate (QXGEO description and equation)
- San Joaquin River Flow Estimate Past Jersey Point (QWEST)
- Sacramento River Flow Estimate Past Rio Vista (QRIO)
Summary of Fish-Related Parameters and Indices
- Percent Water Diverted (QDIVER)
- Effective Western⁄Central Delta Inflow (QEFFECT)
- Effective Percent Western⁄Central Delta Water Diverted (QEFFDIV)
- Summary Tables of Monthly Data
Estimated Input Parameters Requiring Further Explanation
- Delta Gross Channel Depletion Estimates (QGCD)
- Delta Precipitation Runoff Estimates (QPREC)
- Delta Cross-Channel and Georgiana Slough Flow Estimate (QXGEO)
- State Water Project Exports (QSWP)
- Miscellaneous Water Diversions⁄Transfers (QMISDV)
- Estimated distance from Golden Gate to 2 ppt Sailinity, km (X2)
Methodology for Dayflow Output Generation