# Presentation: 057602

## Single Purpose AnalysisIterative Process for Single Purposes – WQ and RF

**CALSIM ****Simulation**

**Compare the ****Long-term****Average Annual ****Friant Unit Delivery ****to Benchmark Study**

**CALSIM ****Simulation ****Completed**

***Increased***

**Increase****Annual Demand**

**Decrease ****Annual Demand**

***Decreased***

***Same***

**Single Purpose Analysis**Iterative Process for Single Purposes – WQ and RF

## Single Purpose Analysis

- Millerton Lake Water Budget Components

**Available ****Storage**

**Forecasted ****Inflow**

**Available Water**

**NOT TO SCALE**

**River Loss**

**Available Water****for Canal Delivery Allocation**

**Canal Loss**

**Evaporation**

**WQ Demand**

**RF Demand**

**Rain Flood Release**

**Annual Reservoir**

**Dynamic allocated based on hydrologic conditions and reservoir storage **

**D/S Water Rights**

**Prescribed based on constant or year-type varying demand patterns**

## Multi-Purpose Analysis Millerton Lake Water Budget Components

**Available ****Storage**

**Forecasted ****Inflow**

**River Loss**

**Available Water****for Canal Delivery Allocation**

**Canal Loss**

**Evaporation**

**WQ Demand**

**RF Demand**

**Rain Flood Release**

**Annual Reservoir**

**Available Water**

**River Loss**

**Available Water****for Canal Delivery Allocation**

**Canal Loss**

**Evaporation**

**WQ Demand**

**RF Demand**

**Rain Flood Release**

**Reservoir with Carryover Storage**

**Carryover Requirement**

**NOT TO SCALE**

**Dynamic allocated based on hydrologic conditions and reservoir storage **

**D/S Water Rights**

**D/S Water Rights**

## Initial Evaluation Approach for USJRBSI, Phase 1

**Friant Enlargement Concept**
**Evaluation scenario only – not an alternative**
- Increase Millerton Lake by 700 TAF
- Simulate operations with additional storage
- Identify how problems and opportunities could be addressed.
- Use results to guide definition of “Functional Equivalence”
**Initial Modeling Assumptions**
**Based on existing conditions and honoring current laws, rules, and regulations.  **

## Initial analysis 
Identify the potential water that could be available from a Friant enlargement to address a single problem area
Water quality, supply reliability, or restoration
Identify how other problems and opportunities could be affected
Water quality
River restoration
Water supply reliability
Flood control
Hydropower
Delta inflow

**Identify the potential water that could be available from a Friant enlargement to address a single problem area**
**Water quality, supply reliability, or restoration**
**Identify how other problems and opportunities could be affected**
**Water quality**
**River restoration**
**Water supply reliability**
**Flood control**
**Hydropower**
**Delta inflow**

**Initial Evaluation Approach for USJRBSI, Phase 1 ****Single Purpose Analysis Approach**

## Initial Evaluation ApproachSingle Purpose Analysis

**Single Purpose Analysis – Operate to address one goal only**
**Single Purpose - Water Supply (WS)**
**Single Purpose - Water Quality (WQ)**
**Single Purpose - Restoration Flow (RF)**
**Same water supply allocation logic**
**Maximize the annual water supply to each purpose while maintaining long-term annual total delivery.  **

## Single Purpose Analysis (Preliminary Assumptions) Scenarios

| Scenario | Friant Unit Delivery | Water Quality Demand  | Restoration Flow Demand  |
| --- | --- | --- | --- |
| Benchmark | Allocations based on a 520 TAF storage | No | No |
| Single Purpose – WS | Allocations based on a 1,220 TAF storage | No | No |
| Single Purpose – WQ | Constrained by Average annual total delivery from Benchmark Study | Maximized Annual Demand by an Iterative Process | No |
| Single Purpose – RF | Constrained by Average annual total delivery from Benchmark Study | No | Maximized Annual Demand by an Iterative Process |

## Single Purpose Analysis (Preliminary Assumptions)Demand Development

|  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- |
|  |  |  | CALSIM | Impact Evaluation |  |
| Initial (preliminary) | Yes | Constant | Complete | Ongoing | Yes |

**Demand Development for Single Purposes – WQ and RF**

**Phase of ****Demand Pattern Development**

**Status**

**Annual Demand **

**Needed for ****Single Purpose Analysis ?**

**Operating Friant as an Annual Reservoir?**

| Refined | Yes | Variable by year type | Ongoing |  –  | Yes |
| --- | --- | --- | --- | --- | --- |

| Future | Undecided | Dynamic | Not in Phase 1 | Not in Phase 1 | No |
| --- | --- | --- | --- | --- | --- |

## Single Purpose Analysis (Preliminary Results) Summary of CALSIM Results

|  |  |  |  |
| --- | --- | --- | --- |
|  | Water Supply | Water Quality | Restoration Flow  |
| Benchmark | 1,242
 | 0 | 0 |
| Single Purpose – WS | 1,376
i.e., + 134 at Friant Dam | 0 | 0 |
| Single Purpose – WQ | 1,249 | 102 at Mendota Pool distributed uniformly in July through September.
i.e., + 138 at Friant Dam  | 0 |
| Single Purpose – RF | 1,245 | 0 | 80 at Mendota Pool distributed in unimpaired flow monthly pattern
i.e., + 152 at Friant Dam |

**Scenario**

**Average Annual Water Allocations for Each Purpose (TAF)**

## Single Purpose Analysis (Preliminary Results) Annual Average Friant Unit Delivery

| 
Scenario |  |  |  |  |
| --- | --- | --- | --- | --- |
|  | Class 1 | Class 2 | 215 Water | Total |
| Benchmark | 745( 0 ) | 352( 0 ) | 145( 0 ) | 1,242( 0 ) |
| Single Purpose – WS | 758
( 13 ) | 570
( 218 ) | 48
( - 97 ) | 1,376
( 134 ) |
| Single Purpose – WQ | 728
( - 17 ) | 476
( 124 ) | 44
( - 101 )  | 1,249
( 7 ) |
| Single Purpose – RF | 725
( - 20 ) | 477
( 125 ) | 44
( - 101 ) | 1,245
( 3 ) |

**Delivery in TAF ****(Difference from Benchmark) **

## Single Purpose AnalysisNext Steps

**Introduce year-type dependent demands for water quality and restoration flow; Options include**
**Annual quantity based on predetermined proportion**
- Benchmark Study water delivery amounts by year type
- Unimpaired flow amounts by year type
- Option to include reductions in a multi-year drought
**Refine approach to preserve long-term average delivery**
- Annual average deliveries by year type
- Water supply reliability similar to that of the Benchmark Study
**Develop guidelines for evaluating impacts **
**Ecosystem, water quality, water delivery, economics, etc.**