SGMA Informational Workshop

Groundwater in Solano County

Chris Lee

Solano County Water Agency

What is Groundwater?

Sacramento Valley Groundwater Basin

Geology

Faults

UplandRecharge Seepage

Sac R.

Confined layers

Salt water

Water Sources

North Bay Aqueduct (State Water Project) Solano Project (Lake Berryessa)

Groundwater

Surface/Groundwater UseSurface Water Use-Acre-Feet/Year-90%

NBA35 TAF

SP175 TAF

Groundwater Use-Acre-Feet/Year-10%

RV3 TAF VV

6 TAF

DXN3.5 TAF

SID10 TAF

Agricultural/Municipal & Industrial Use

M&I36%

Ag Use74%

5-21.66

Northern Solano X-sec

Its Complicated!

Long-term Well Data

Sola

no

Pro

ject

19

47

-19

50

Dro

ugh

t

19

59

-19

62

Dro

ugh

t

19

76

-19

77

Dro

ugh

t

19

87

-19

92

Dro

ugh

t

20

00

-20

02

Dro

ugh

t

20

07

-20

09

Dro

ugh

t

20

12

-20

15

+ D

rou

ght

Some areas of the County show different conditions• Along Putah Creek• The Dixon Ridge• Montezuma Hills

Reduction of groundwater storage

Sea water intrusion

Degraded water qualityLand subsidence that

substantially interferes with surface land uses

Chronic lowering of groundwater levels

Depletions of surface water that have adverse impacts on

beneficial uses of surface water

Critical Parameters as Defined by DWR

Groundwater Monitoring

• CASGEM

• Urban Water Management Plans

• Agricultural Water Management Plans

• Irrigated Lands Program

• Deep Monitoring Wells

• Land Subsidence

Currently Monitored WellsCurrently Monitored Wells

SCWA Deep Monitoring Wells

Subsidence Monitoring

Next Steps

• Fill Data Gaps

• Expand Groundwater Toolbox

• Continued Coordination/Collaboration

• For More Information:

www.scwa2.com/SGMA

707-451-6090