2010 Chino Basin Recharge Master Plan Update

Production and Replenishment Optimization

and 2009 Peace II CEQA Analysis

2010 Chino Basin Recharge Master Plan Update

Production and Replenishment Optimization

and 2009 Peace II CEQA Analysis

July 23, 2009

Goal Today

Provide a description of the work and conclusions for:

Production and replenishment optimization

Peace II CEQA hydrologic analysis

Background

2007 Peace II Analysis

Projected production was not sustainable.

2008 Dry-Year Yield Expansion

Projected production was not sustainable.

Optimization Approach

Problem: Pumping depressions limited the amount of water that could be produced.

Solution: Trial and error optimization to satisfy production projection:• Operational constraints include drawdown limits

at production wells and spreading capacity. • Decision variables include production quantity,

production location, replenishment quantity, and replenishment location.

• Results include values for decision variables that satisfy the most operational constraints.

Develop Drawdown Constraints

Update Pumping PrioritiesPrepare Model Input Files

Run Model

Demand Met?

Drawdown Constraints

Met?

Modeling Completed

Update Replenishment Priorities

No

No

Yes

Yes

Wells used in optimization map

Production and Replenishment Optimization Results

Near optimal solutionProjected production can be met

Not all drawdown constraints are met

Peace II Analysis

Purpose: To identify the hydrologic impacts of implementing Peace II using the updated Baseline

Water level changes

Changes in the movement of water quality anomalies

Potential for subsidence

Ability to maintain hydraulic control

Baseline and Peace II Alternatives

Alternative B

Alternative A

Peace II Alternative- Desalter Expansion to 40,000 acre-ft/yr- Re-operation- 100,000 acre-ft DYY Program

Baseline B

Baseline A

Baseline- Desalter Expansion to 40,000 acre-ft/yr- Full Desalter Replenishment- 100,000 acre-ft DYY Program

B- Replenishment

Water Supply from MWDSC

A- New

Replenishment Supply

Unmanaged CURO (figure 1)

Add that this is no reop…..

Unmanaged CURO (figure 2)

Additional Replenishment Supply (figure)

Reduced Production (figure)

Differences Table

Peace II Analysis Results

Water levels

Water quality anomalies

Potential for subsidence

Hydraulic control

Baseline A Drawdown

Difference Map A L1

Baseline B Drawdown

Difference Map B L1

Pomona

MVWD

Chino Hills

Chino

Ontario

CVWD

Fontana

JCSD

Water Levels near Riparian Habitat

Evaluated groundwater level changes under riparian habitat

Compared water levels in 2030 for the Baseline and Peace II Alternatives

Figure 1

Figure 2

Changes in the Movement of Water Quality Anomalies

Simulated the movement of known water quality anomalies in the Chino Basin

Estimated the difference in the movement of these anomalies resulting from the implementation of the Peace II Agreement

Plume Figure (A scenarios)

• This figure shows– 2008 plumes in grey– Appropriator wells in colored circles.– Dashed blue is w/o Peace II/Re-operation

Potential for Subsidence

• Regional groundwater level change

PA-7 Hydrograph

HC Figure 1

HC Figure 2

Conclusions

Water levels

Water quality anomalies

Potential for subsidence

Hydraulic control

Questions