### METADATA ### 

# Title: Upper Klamath River Basin Surface Water Hydraulic Modeling Data from the Klamath River Basin Revised Natural Flow Study

# Author: Colin Byrne

# Publisher: Bureau of Reclamation

# Date of Publication: 9/01/2025

# Link to RISE Catalog Item: https://data.usbr.gov/catalog/8528/item/133877

# Modeling Component Name

Klamath River Natural Flow Study Surface Water Hydraulic Modeling

## Introduction

The main objective of the Klamath Natural Flow Study (KNFS) is to develop daily natural streamflow estimates from wateryear (WY) 1981 through WY 2020 at various locations in the Upper Klamath Basin. To accomplish that, seven different hydrologic models are being developed to contribute to the overall mass balance needed to estimate daily streamflow in the absence of land use changes, major development, and water management. Hydraulic modeling is one of the components needed to develop the mass balance to estimate natural streamflows. The hydraulics component of the Klamath River Basin Revised NFS focused on locations within the Klamath River Basin that are important to water storage and surficial exchange with other portions of the basin that may impact Klamath River streamflow. Key hydraulics components include area-capacity curves, lateral hydraulic connectivity, engineered and natural hydraulic controls, and hydraulic roughness along rivers. Hydraulic analyses were conducted for both 1981-2020 and pre-development conditions:

	• 1981–2020 conditions are defined as the landscape and hydrologic conditions that occurred from WY 1981 through WY 2020, as a result of land use, development, and water management practices. Note, the recently removed dams along the Klamath River were in place during this entire period.
	• Pre-development conditions are defined as the landscape and hydrologic conditions that existed prior to significant infrastructure development of the region for irrigated agriculture, forestry, and other purposes, but that would have occurred under the climate conditions of WY 1981 through WY 2020.

## Features

  -- models
		-- KlamathRiver_LostRiverSlough_LowerKlamathLake 
				- includes model inputs for the pre-development Klamath River, Lost River Slough, and Lower Klamath Lake two-dimensional (2D) model
				- To use the model, users need Aquaveo's Surface Water Modeling System (SMS), which can be downloaded for free. The user can then drag the *.srhhydro file into SMS and it should load the other model files.
				- The model that will load is just one version of the hundreds of models that were created for the Klamath Natural Flows Study. Other models used different boundary conditions.
		-- linkRiver_hydraulicControl
				- includes model inputs for the Link River hydraulic control 2D model
				- An SMS project file (*.sms) is included in this folder with a set of all necessary inputs. This model uses an older version of SMS meshing using a *.2dm file

  -- final_products - Because hundreds of model runs were completed for this research effort, not every model result has been included here, but results are summarized within this folder and available upon request
		-- acaps
		-- includes area-capacity (ACAP) relationships for 1981-2020 and pre-development conditions at several lakes and reservoirs
				- 1981-2020 condition ACAPs: Clear Lake, Gerber Lake, Rogue basin (Emigrant, Hyatt, Howard Prairie), Tule Lake sumps, Upper Klamath Lake, Pacificorp (JC Boyle, Copco 1, Iron Gate)
				- Pre-development conditions: Lower Klamath Lake, Tule Lake, Upper Klamath Lake
		-- flow_tables
				- final flow exchanges between the Klamath River and Lower Klamath Lake as well as flow lost through the Lost River Slough 
				- sensitivity analysis results also included in this folder
		-- rating_curves
				- developed for the Upper Klamath Lake hydraulic control under 1981-2020 and pre-development conditions

	
## Contributions

Colin Byrne maintains these hydraulic analysis products; please reach out to cbyrne@usbr.gov with any questions.

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