Presentation Title

Hydrologic Analysis using Civil Design verses HEC-HMS on Horsethief Creek Canyon Wash, California

Faculty Mentor

Seema C Shah-Fairbank

Start Date

17-11-2018 2:15 PM

End Date

17-11-2018 2:30 PM

Location

C302

Session

Oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

This project develops an effective process to compare hydrologic results from CivilD and HEC-HMS. CivilD is a hydrologic modeling software used in Southern California: specifically Riverside, Los Angeles, San Diego, Orange, and San Bernardino counties. The software has a fee, but contains all of the necessary parameters to model a watershed with respect to the requirements in the jurisdictions with which it has received approval. HEC-HMS is a free hydrologic modeling software provided by the US Army Corps of Engineers, where the engineer needs to input all the necessary parameters. The results show that the percent difference between CivilD and HEC-HMS is 2.08% on average between varying storm return periods and durations. The greatest error occurs during the 25 year 24 hour storm due to, what is believed to be, variation in rounding of excess precipitation values between HEC-HMS preprocessing and the CivilD software. The study does not recommend the use of either software, it merely illustrates that they are both reliable tools for calculating flow rate. Based on our findings, we are able to verify the results of HEC-HMS with CivilD, and provide users with a clear understanding of the various inputs and outputs the programs require and generate, respectively. In addition, HEC-HMS allows a user to test various other hydrologic modeling methods, as the program provides a platform for more user autonomy. Thus, a user will gain value through exposure to insights this paper provides, which explain why a certain method is applicable for this project.

Summary of research results to be presented

This research project focuses on investigating how to determine the data necessary to evaluate the watershed of interest in Riverside County, California. That data is then input into the hydrologic analysis software, CivilD. CivilD is user friendly and allows the user to simply input watershed characteristics to derive a peak flowrate (Peak Q), and output volume through the production of a Runoff Hydrograph. This project uncovers the hydrologic analysis methodology behind CivilD and demonstrates how the same results are reproducible in HEC-HMS. The data processing is outlined and the resulting outputs from both programs are compared analytically in tabular and graphical form. After processing the data from the Horsethief Canyon Wash Watershed in both CivilD and HEC-HMS, identical results were computed for each model. The HEC-HMS model was found to elicit a Peak Q as much as 4.92% different from the CivilD Peak Q, and as little as 0.03% different. These findings are an indication that HEC-HMS is an invaluable tool to the practicing engineer, and can clearly be used in lieu of CivilD, especially if financing CivilD is not worthwhile. It can also be used as an alternative method for verifying results found in CivilD.

This document is currently not available here.

Share

COinS
 
Nov 17th, 2:15 PM Nov 17th, 2:30 PM

Hydrologic Analysis using Civil Design verses HEC-HMS on Horsethief Creek Canyon Wash, California

C302

This project develops an effective process to compare hydrologic results from CivilD and HEC-HMS. CivilD is a hydrologic modeling software used in Southern California: specifically Riverside, Los Angeles, San Diego, Orange, and San Bernardino counties. The software has a fee, but contains all of the necessary parameters to model a watershed with respect to the requirements in the jurisdictions with which it has received approval. HEC-HMS is a free hydrologic modeling software provided by the US Army Corps of Engineers, where the engineer needs to input all the necessary parameters. The results show that the percent difference between CivilD and HEC-HMS is 2.08% on average between varying storm return periods and durations. The greatest error occurs during the 25 year 24 hour storm due to, what is believed to be, variation in rounding of excess precipitation values between HEC-HMS preprocessing and the CivilD software. The study does not recommend the use of either software, it merely illustrates that they are both reliable tools for calculating flow rate. Based on our findings, we are able to verify the results of HEC-HMS with CivilD, and provide users with a clear understanding of the various inputs and outputs the programs require and generate, respectively. In addition, HEC-HMS allows a user to test various other hydrologic modeling methods, as the program provides a platform for more user autonomy. Thus, a user will gain value through exposure to insights this paper provides, which explain why a certain method is applicable for this project.