Groundwater Water Budget Requirements 11/13/2019 - - PowerPoint PPT Presentation

▶

Feb 02, 2024 260 likes •411 views

. Groundwater Water Budget Requirements 11/13/2019 PETALUMAVALLEYGROUNDWATER.ORG 1 September November 2018: 1.0 Introduction- Initial Draft and Advisory Committee Review Complete 2.0 Description of Plan Area - Initial Draft and Advisory

SLIDE 1

Groundwater Water Budget Requirements

11/13/2019 PETALUMAVALLEYGROUNDWATER.ORG 1

SLIDE 2

Petaluma Valley GSP Section Development Working Schedule

PETALUMAVALLEYGROUNDWATER.ORG 2

September – November 2018:

1.0 Introduction- Initial Draft and Advisory Committee Review Complete 2.0 Description of Plan Area - Initial Draft and Advisory Committee Review Complete

December 2018 – December 2019:

3.0 Basin Setting 3.1 Hydrogeologic Conceptual Model - Initial Draft provided to Advisory Committee May 2019 3.2 Current and Historical Groundwater Conditions Initial Draft provided to Advisory Committee September 2019 3.3 Water Budget 3.4 Management Areas Bring Drafts of Sections 1 through 3 to GSA Board for Input: Hold Public Workshop on Sections 1 through 3

January 2020 – December 2020

4.0 Sustainable Management Criteria 5.0 Proposed Monitoring Program Bring Drafts of Sections 4 and 5 to GSA Board for Input: Hold Public Workshop on Sections 4 and 5

January 2021 – December 2021

6.0 Projects and Actions 7.0 Implementation Plan Bring Completed Draft Entire GSP to GSA Board for Input: Hold Public Workshop(s) on Complete GSP

SLIDE 3

Water Budgets

GENERAL WATER BUDGET COMPONENTS AND SGMA REQUIREMENTS

11/13/2019 SONOMAVALLEYGROUNDWATER.ORG 3

SLIDE 4

SGMA Water Budgets

CA CCR §354.18 & Best Management Practices document Three water budgets for GSP:

1. Historical conditions
2. Current conditions
3. Projected conditions over the 50-year planning and implementation horizon

Water budget must include:

Inventory of all inflows (supply) and outflows (demand)
Summary of both surface water and groundwater budgets
Evaluation of changes of groundwater in storage
Estimation of groundwater overdraft (if applicable)
Estimation of sustainable yield

SLIDE 5

Summary of Typical Surface Water Budget Components

SURFACE WATER INFLOWS

Stream inflows from outside of basin
Overland runoff (from precipitation)
Groundwater discharge to streams
Irrigation return flows

SURFACE WATER OUTFLOWS

Streambed recharge to groundwater
Direct stream diversions
Evaporation (often negligible or hard to

compute)

SLIDE 6

Summary of Typical Groundwater Budget Components

GROUNDWATER INFLOWS

Deep percolation of precipitation
Streambed recharge to groundwater
Deep percolation of applied irrigation water

(or irrigation return flows)

Septic system return flows
System loss return flows
Subsurface inflows

GROUNDWATER OUTFLOWS

Groundwater pumping (agricultural, urban,

domestic)

Groundwater discharge to streams
Subsurface outflows to adjacent basins
Riparian and crop evapotranspiration

SLIDE 7

Water Budget Diagram

From: Water Budget BMP, California Department of Water Resources, 2016

SLIDE 8

Groundwater Modeling

GENERAL INFORMATION ON HYDROLOGIC MODELS APPROACH FOR USING MODELING FOR GSP

11/13/2019 SONOMAVALLEYGROUNDWATER.ORG 8

SLIDE 9

What is a Hydrologic Model?

Models are a mathematical approximation of physical processes underground Models are powerful tools that integrate measured and observed hydrologic data and provide estimates within data gap areas Models organize and synthesize multiple related activities and hydrologic processes

Groundwater pumping
Rainfall and recharge
Evapotranspiration
River flows
Groundwater flow and fluxes

9 Discretized hypothetical aquifer system. (Modified from McDonald and Harbaugh, 1988)

SLIDE 10

Groundwater Flow Model – USGS (under review)

Integrated Hydrologic Model

Climatically driven agricultural demands
Streamflow simulation
Incorporation of surface water diversions
Recycled Water deliveries
Representation of land use trends and

changes Example Model Uses

Estimate hydrologic budget
Identify recharge areas
Evaluate water-resource management

strategies

Evaluate climate-change impacts
Evaluate effects of changes in land-use

SLIDE 11

Typical Model Outputs – Overall Water Budgets

Exam ample f from S Sonoma V a Valley M Model

SLIDE 12

SONOMAVALLEYGROUNDWATER.ORG 12

Typical Model Outputs – Detailed Budget Components

Exam ample f from S Sonoma V a Valley M Model

SLIDE 13

11/13/2019 SONOMAVALLEYGROUNDWATER.ORG 13

Historical calibrated Model Historical water budget Current water budget Include climate change and projected urban growth/land use changes Baseline future water budget Develop SMCs Develop projects and actions Projected future water budget Are SMCs met? Yes No

GSP Modeling Process Flow

Projected Model with projects and actions

SLIDE 14

11/13/2019 SONOMAVALLEYGROUNDWATER.ORG 14