Green House Gas Emissions Calculator

The Greenhouse Gas (GHG) Emissions Calculator was developed as a tool to support the Climate Change Analysis. It was developed to evaluate mitigation strategies, while the Climate Change Analysis focused primarily on adaption and vulnerability analysis. Development of the tool began in 2012 and was completed in August 2013.


Click here to view User Manual for the Greenhouse Gas Emissions Calculator for the Water Sector


This manual explains the methods used to develop the calculator and provides instructions on how to use it by introducing examples. The examples focus on the SARW to show how to develop a GHG emissions baseline, evaluate what it would take to meet specific GHG emission reduction goals, and illustrate how the GHG Emissions Calculator can be used to analyze projects.


Chapter 1 of the manual provides an introduction to the project, a literature review, and a summary of California’s GHG legislation. The methods used in the GHG Emissions Calculator can be found in Chapter 2. A guide showing users what data is needed and how to enter that data can be found in Chapter 3. Chapter 4 provides an introduction to the SARW, the GHG emission baseline for the SARW, discusses varies scenarios to reduce GHG emissions, and compares those reduction scenarios. In Chapter 5 SAWPA’s 20 finalist for the Integrated Regional Water Management (IRWM) funding were analyzed using the GHG Emissions Calculator.


The Greenhouse Emissions tools allow the user to estimate GHG emissions from 1990-2050 regardless of data availability. The instructional video below provides a detailed overview of the various tools. These tools can be used with 3 levels of data: Required Data, Suggested Data, and Detailed Data or any combination of the 3. Yellow cells in each worksheet can take user input, blue cells are calculated values, and tan cells provide detailed instructions.


GHG Scenario Manager          GHGE Calculator


Climate Change Analysis

The climate change analysis for the Santa Ana Watershed report explains the methods used to develop an analysis of potential implications of the changing climate, and how those implications might affect issues of importance to the Santa Ana River Watershed. Chapter 1 provides an introduction to the project and the study area, along with a summary of relevant previous studies. The development of climate projections and hydrology models used can be found in Chapter 2. Chapter 3 provides projections for water supply and demand in the SARW. An impact analysis was conducted focusing on key areas of importance to the SARW, the results of which can be found in Chapter 4. A tool to evaluate demand management is presented in Chapter 5, along with a case study of potential adaptation strategies. Chapter 6 addresses uncertainties in climate change analysis.

Climate Change Analysis: Santa Ana River Watershed

OWOW 2.0 Climate Change Workshop Presentation