Abstract

The increase in the pollution of existing water bodies due to poor management of storwater runoff has demanded continuous re-evaluation of present design methods for stormwater management facilities. Current criteria used in determining water quality (treatment) volumes in pond design neglect antecedent conditions resulting from preceding rainfall. The inter-event dry period refers to that time period (hours) which occurs between rainfall events. The

minimum inter-event dry period used for pollution control design should be consistent with the time required for infiltration, chemical precipitation, sediment removal, and biological assimilation; as well as the period of time required to minimize the cumulative effects of pollutants discharged to receiving water bodies. Spreadsheet programming was used for calculations using fifteen years of data from seventeen rainfall station locations in the State of Florida. An exceedence probability analysis was performed for rainfall records with inter-event dry periods of 4, 12, 24, 48, 72, 96, and 120 hours. The precipitation volume associated with each inter-event dry period and specified return period was calculated and the results are presented in P-I-F Curves. This study also includes a diversion volume analysis for

all seventeen rainfall stations. The diversion volume method for water quality treatment is directed specifically towards use in off-line retention systems. A cumulative distribution function was generated from the fifteen year database for inter-event rainfall records of 4, 24, and 72 hours. Diversion volume curves were developed for each rainfall station and are presented in this report. Consideration of the inter-event dry period through the use of the design curves developed in this research provide a design where initial conditions are more accurately defined. Water quantity volumes which produce the desired level of treatment for stormwater runoff can be more accurately determined as a result of this type of design.

Notes

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Graduation Date

1991

Semester

Fall

Advisor

Wanielista, Martin P.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Civil and Environmental Engineering

Degree Program

Civil Engineering

Format

PDF

Pages

182 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0029080

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

Accessibility Status

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