Document Actions
20080527Minutes
Attending:
Bob, Alex, Deanne, Lisa
Grey=Requires landuse data, updated consistently, and historic data needed to eval trends
Orange= problematic for other reasons
Review of work on "White" indicators:
Stream flow/Supply
- Runoff coefficient
Alex working with Bob's methods (Oak Knoll, rainfall vs runoff) and will have results this week. Got Chris Ferrar's synthetic hydrograph for missing years '82-'02, and the rainfall records from Sonoma Dev Center from '52. Now have rainfall data for all the years that we have flow data.
Bob has done the work for Napa. Trying to decide if the trends are meaningful, would like input from others on how to quantify error bars. And it will be interesting to compare the Sonoma data. Lisa notes that there are different trends in the Oak Knoll data depending on the length of the running average- what do we think of that? Question is: is the drop in the runoff coeff significant? do we see a similar trend in Sonoma? also worth looking at the late season flow and irrigation. Big question is- how do we feel about this indicator as a score in the scorecard and how will the metric be used. Need to compare to historical values. Need to decide how current conditions compare with the trends from the past. Availability for beneficial uses is what we're trying to get at. Are we gauging management or just runoff? If we're not seeing a signal of increased RO/P it may not be a good management indicator.
Action items: Finish Sonoma data analysis, send to Peter and Chris Ferrar for their opinions. Decide how to use and present in the scorecard.
- Dry season flow
Need to get our low-flow data- Deanne call Victor back. Alex will clean up and send to Peter to see if he can pull out anything meaningful. Napa doesn't have that kind of data. Bob came up with average dry season flow from the stream gauge at Oak Knoll. Appearing to be a slight upward trend, when expressed as percent of annual rainfall. Look at rainfall compared to extent of dry channels in Sonoma.
Action items: Talk with Mike Webster about the utility of dry season flow and how best to calculate. Alex will do this.
Go through the calculations and see
Storage
- Surface Storage
Bob looking at records for Napa reservoirs, Alex at SDC reservoirs.
Napa has high and low for each calendar year, could use the ratio to see how much water supply you have.
Action items: continue with obtaining data for both watersheds.
- Groundwater storage
Relying on well monitoring data, Sonoma deciding whether to pick the 8 historic wells or look at an area where there is a problem... To be consistent we could choose the DWR network in both watersheds.
Action items: Lisa will get the well data for Alex and Bob for Napa with a contact from Lisa- Mark Norburg. Spring and Fall measurements, longest term that is possible. Decide how to score- just thumbs up or down (aquifer rising or dropping? Compare recent data with historic trends- is our aquifer full? Get data first, organize it and then talk to Chris Ferrar about the model for a good ground water depth and how to interpret.
Stewardship
- Efficiency
Peter
- Demand
Action items: Alex to follow up on initial contact with Tim Parker. Records kept by PRMD. Water use estimates come right out of Groundwater Mgt Plan.
Bob did his task, got population figures for incorporated areas and annual series of total water supply from '68 to 2005. Tried some averages, there appears to be upward trend in per capita use. Compare the most recent values with
Sonoma will summarize from GW Plan.
Action items: Bob will share the data. Sonoma to find out more about how our data works- Alex to discuss with Tim Parker.
Set meeting in June- 18 10-1 is good. Deanne will email everyone.