The Central Valley Hydrology Study (CVHS) was a multi-year effort of the California Department of Water Resources (DWR) and the US Army Corps of Engineers, Sacramento District (Corps), to update flood hazard information for the Central Valley. CVHS developed unregulated volume-frequency curves and regulated peak flow-frequency curves at over 200 locations. This systemwide information will be the basis of Central Valley studies for years to come and has already been applied for several studies, including the Central Valley Flood Protection Plan.

Below are CVHS technical memoranda and reports.

2015

CVHS_Final_Report

Appendix_I_Analysis_Points

Appendix_II_Computer_Models

Appendix_III_Flow_Time_Series_Development

Appendix_IV_Completed_Unregulated_Flows

Appendix_V_Annual_Series_for_Freq_Analysis

Appendix_VI_Unregulated_Flow-Freq_Analysis

Appendix_VII_Unregulated_Flow-Frequency_Curves

Appendix_VIII_Regulated_Flow_Time_Series

Appendix_IX_Extracted_Event_Dataset

Appendix_X_Transforms_and_Critical_Duration

Appendix_XI_Rainfall-Runoff_Modeling

2013

The sections below contain CVHS interim work product technical reports and memoranda prepared by various members of the CVHS study team. DWR’s Division of Flood Management, Hydrology Branch (referred to herein as DWR), was the project client. The CVHS study team was led by the US Army Corps of Engineers, Sacramento District, and is comprised of staff from the Corps, DWR, and the Corps’ prime contractor for this effort, David Ford Consulting Engineers. Although portions of the study were completed by various team members, the Corps approves all work products. This approval includes review following the District Quality Control process and Agency Technical Review. Details on the Corps approval and review process are available from the Corps.

These approved interim products are being provided for information and documentation purposes only. Documented interim results and findings during this development process were subject to change. The CVHS final report (2015) is the final documentation of the process and deliverables.

Interim work product technical memoranda

Summary_CVHS_Posted_Memoranda

09302011_PD3_Relate_Analysis_Points_To_Model_Nodes

08112011_PD3_Alternative_Augmentation_84A

07062011_PD3_CVHS_Local_Flow_Augmentation

07032012_PD5_Complete_Regulated_Time_Series

06202011_PD2_CVHS_Unregulated_HEC-RAS_Model

06142010_PD2_PBS&J_HEC-RAS_Model_Review

06142010_PD2_CVHS_HydraulicModels_Memo

06142010_PD2_Common_Features_HEC-RAS_Model_Review

02092011_PD2_CVHS_Regulated_HEC-RAS_Model

02082013_PD5_Additional_Scale_Factor_Simulations

02082012_PD3_Complete_Unregulated_Time_Series

01272012_PD3_Selecting_Event_Time_Windows

T2 Local flow development 20110705

Interim work product sensitivity analysis reporting

The following interim work product memoranda describe various sensitivity analyses and comparisons to past studies that were completed throughout the study. This is not an exhaustive list of the sensitivity analyses. However, the documents provided below describe sensitivity analyses related to unregulated flow routings and comparisons of those routings to past studies.

Summary_CVHS_Sensitivity_Analyses

12192012_Frequency_Curve_Comparison_Plots

08212012_Flow_Comparison_Feather-Yuba_Confluence

08142012_Upper_Feather_River_Frequency_Curve_Comparison

03202012_CVHS_vs_Comp_Study_Detailed_Comparison_Butte_Sink_Routing

03202012_CVHS_vs_Comp_Study_1997_Unreg_Boundary_Conditions

03202012_CVHS_vs_Comp_Study 1997 Unreg_Local_Flow_Comparison

03052012_CVHS_vs_Comp_Study_1997_Unreg_Routing_Comparison

2011

2011_CVHS_ungaged_watershed_analysis_procedures

2011_CVHS_procedures_document

2011_CVHS_procedures_&_ungaged_analysis_review_comments

2010

2010_life_after_CVHS_document

2009

2009_CVHS_procedures_flowchart

2009_CVHS_list_of_modeled_reservoirs

2009_CVHS_illustrative_example

2009_CVHS_data_management_plan

2009_CVHS_product_uses_document

2008

2008_CVHS_procedures_document

2008_CVHS_procedures_doc_review_comments