Stormwater Management

Poster Presentation

Hydrologic Modeling of Watershed Processes after Vegetation Restoration in an Urban Watershed using HEC-HMS

Tuesday, February 13
1:30 PM - 3:30 PM


Level of Presentation: Beginner

This session will discuss an ongoing restoration project of a urbanized creek near San Diego State University, CA. I will be sharing information about my hydrologic model developed through the USACE HEC-HMS program that can be used to guide future restoration projects. S

The San Diego River Watershed in California is highly urbanized, where stream channel geomorphology are directly affected by anthropogenic disturbances. Flooding and water quality concerns have led to an increased interest in improving the condition of urban waterways. Alvarado Creek, a 1200-meter section of a tributary to the San Diego River will be used as a case study to understand the degree to which restoration efforts reduce the impacts of climate change and anthropogenic activities on hydrologic processes in urban stream ecosystems. In 2016, non-native vegetation (fan palm (Washingtonia spp.), Canary Island palm (Phoenix canariensis)) and approximately 7250 kilograms of debris were removed from the study site. This research develops the United States Army Corp of Engineers Hydrologic Engineering Center’s Hydraulic Modeling System (USACE HEC-HMS) using field-based data to model and predict the short- and long-term impacts of restoration on geomorphic and hydrologic processes. Field observations include cross-sectional area, grain-size distributions, and continuous measurements of streamflow, temperature, and precipitation from Fall 2015 to present. Baseline and design storms are simulated before and after restoration. The model will be calibrated and validated using field observation data. Design storms simulated will represent statistical likelihoods of storms occurrences, and the before and after restoration hydrologic responses will be compared to evaluate the impact of vegetation and waste removal on runoff processes. Ultimately model parameters will be transferred to other urban creeks in San Diego that may undergo potential restoration. Hydrologic modeling will be used to learn about the response trajectory of rainfall-runoff processes following restoration efforts in urban streams and guide future management and restoration activities.

Learning Objectives:

Target Audience: Academic,Engineer,Government Agency,Storm Water

Kyler Stevenson

Undergraduate - Environmental Engineering
San Diego State University

I am an undergraduate researcher at San Diego State University. I work under Dr. Alicia Kinoshita in the Disturbance Hydrology lab that is part of the Civil, Construction, and Environmental Engineering Department. While we are involved in all kinds of disturbances, I mostly focus on an ongoing restoration project that is located near the SDSU campus. My work includes understanding the restorations' effects on hydrologic and geomorphic processes, and to attempt to model some of these processes.

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Hydrologic Modeling of Watershed Processes after Vegetation Restoration in an Urban Watershed using HEC-HMS

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