A two-component linear model to compute runoff hydrograph on an urban watershed is developed. The method is based on a linear reservoir approach and considers the rainfall-runoff processes separately for the impervious and for the pervious parts of the watershed, before combining them to obtain the total hydrograph. Methods of determining model parameters are discussed and the effects of increased urbanization examined. Included in this thesis are a description of the theoretical development of the model, the verification of the model by its application to Arcadia Watershed, and the computer program that describes the computation in the model.

Structural health monitoring (SHM) is an emerging field in civil engineering in recent years. The main objectives of the SHM are to identify structural integrity issues at early stage and improve the structural safety through measuring and analyzing structural behaviors. Sensing systems for SHM can be used to identify applied vehicle loads for bridge structures. Bridge weigh-in-motion (BWIM) is one type of such vehicle load identification. As a tool to monitor the vehicle weight moving on the bridges, BWIM uses the structural responses induced by moving vehicle on the bridge to back-calculate vehicle information. In this thesis, optimized BWIM systems using multimetric measurements will be investigated. In Chapter 1, the concept and background of BWIM systems will be introduced. The objective of this research will be also demonstrated in this chapter. Chapter 2 is the literature review section. In Chapter 3, the finite element bridge model adopted for this study will be described. In this section, the moving-load time history analysis, sectional properties for bridge members, and other structural parameters of bridge model will be introduced. The methodology of BWIM systems used in this study will be demonstrated in Chapter 4. In Chapter 5, optimized sensor locations for BWIM using normal and shear strain measurements and acceleration measurement will be discussed for the case without measurement noise. In Chapter 6, sensor location optimization for the case considering measurement noises will be investigated. A new acceleration-based BWIM method is proposed in this section. Non-drift displacement reconstruction technique using acceleration measurement and FIR filtering is applied for BWIM. Finally, Chapter 7 is the conclusion part of this thesis.

Sediment carrying pool-rapid rivers are abundant in the United States. However, not much is known about the behavior of the pool beds. It is known that with an increase in the flow that sediment eventually is scoured from the bed and when the flow is decreased the bed elevation eventually increases, but what actually occurs before the final equilibrium bed configuration is attained can only be approximated. It is a reasonable assumption that the bed elevation fluctuates due to scour and deposition, until the final equilibrium bed configuration is attained. An approximate analysis of the scour and fill patterns of the pool-rapid river was made to predict the scour and fill patterns of pool-rapid rivers. A numerical model was analyzed to better account for what actually happens to the pools. The results of the analysis verified that when there was a change in the flow that the pool bed had fluctuated by scouring or filling, and that the time period until equilibrium would occur varied by several orders of magnitude.

The Central Arizona Project is a water delivery system which will bring Colorado River water to urban and agricultural areas in central and southern Arizona via a 330-mile canal. Colorado River water is a high quality source but will minimally require treatment for turbidity removal and disinfection in order to meet federal, state and municipal standards. In this research, ozone treatment of CAP canal water was investigated. A parametric study was conducted to evaluate the effects of Ozone dose, aluminum sulfate dose and mixing conditions on turbidity and particle removal, organic carbon removal and filtration characteristics. Fluctuations in raw water quality were substantial over the sampling period of several months. At a 95% confidence level, turbidity removal by filtration depended on alum dose and rapid mix duration. Particle removal and TOC removal by filtration depended on ozone and alum doses as well as mixing time. Substantial removal of organic carbon, did not occur, but the mechanism of removal was found to be adsorption and subsequent filtration. In pressurized filtration tests, volume throughput was found to be dependent on ozone and alum doses, with higher alum doses resulting in decreased filtration.

The goal of this project was to determine the performance of two types of stilling basins with varying tailwater elevation. The performance was evaluated in terms of scour at the toe of the stilling basin and containment of the jump in the basin. The investigation involved establishing the relationships for different flow rates, different velocities and depth of approach flow for the U.S. Bureau of Reclamation stilling basins III and IV. It is well known that the Bureau of reclamation stilling basins perform satisfactorily for design tailwater conditions. It is not clear how much higher or lower the tailwater can be and still have marginally acceptable performance in the basin. This research sought to establish: (1) the behavior changes with high and low tailwater, and (2) the limiting range of tailwater for acceptable performance.