Risky Lifestyles and Unintentional Firearms Fatalities

This state-level study departs from other investigations of unintentional firearms fatalities by examining the relationships between lifestyle choices, legislation, and accidental gun deaths. We find that the source of these deaths is very similar to those for unintentional fatalities from other mechanisms, such as motor vehicle accidents, residential fires, or occupational injuries. Unintentional mortality is consistently associated with state-level indicators of risky behavior, and to a lesser extent, inactivity. Moreover, we also examined the influences of child access prevention (safe storage), overall firearms laws, and background checks on firearms fatalities. Unlike previous research, we found that these legislative initiatives were not significantly associated with reductions in accidental shooting deaths. Our findings suggest that theories about unintentional fatalities will remain incomplete and harm reduction policies, including the public health model endorsed by many scholars, will not be fully effective if the role of risktaking and sensation-seeking behaviors as an important source of these tragedies is neglected

Sustainability Of Dual Water Distribution Systems For Fire Flow Condition

The objective of this study is to compare the sustainability of current water systems when a dual water distribution system (WDS) is used for the non-potable water purposes of fire protection, irrigation, and toilet flushing. Sustainability of urban WDS is evaluated in terms of hydraulic efficiency and water quality. The first step is to assess sustainability of an example urban WDS by using sustainability index (SI). The SI is measured by reliability, resiliency, and vulnerability performance indices. Pressure and water age are selected as main parameters to determine sustainability. Once the SIs for pressure and water age are calculated by using the extended period simulation in the U.S. Environmental Protection Agency EPANET, these parameters are aggregated into an overall score (SIoverall). The critical areas are identified and improved by either adding network elements (i.e. pumps, valves) or adding a second WDS (i.e. reclaimed WDS) to serve for non-potable water demand. Fire flow is added to the modified WDSs and the SI is calculated again. The proposed methodology and application for SI calculation of WDS proved to be a credible approach in identifying poor performance areas and improving water services. A dual WDS for fire flow, irrigation and toilet flushing can assist in providing sustainable water utilities in urban areas meeting future needs. A linear programming procedure is used to determine the minimum cost of the branched dual WDS

Advanced methodologies for design of storm sewer systems

This report describes the development of a series of computer models capable of determining the diameter, slope and crown elevations of each sewer in a storm drainage system in which the layout and manhole locations are predetermined. The criterion for design decisions is the generation of a least-cost system. The basis for all of the models is the application of discrete differential dynamic programing (DDDP) as the optimization tool. Two important concepts are introduced as optimal model components: hydrograph routing and risks and uncertainties in designs. Three routing procedures are adopted, each with its own advantages. Expected flood damage costs are evaluated through the analysis of numerous risks and uncertainties associated with the design. This analysis permits the estimation of the probability of exceeding the capacity and the corresponding expected assessed damage of any sewer in the system. The expected damage cost is added to the installation cost to obtain the total cost which is then minimized in the DDDP procedure. Two example sewer systems are used as a basis for illustrating different aspects of the various least-cost design models and developing user guidelines.U.S. Department of the InteriorU.S. Geological SurveyOpe

Illinois least-cost sewer system design model: ILSD-1 & 2 user’s guide

ILSD models are sewer system models for least-cost optimal design of the entire system. ILSD-1 designs for a specified layout the size and slope of the sewers with or without detention storages with user supplied rainfall and/or inlet hydrographs. ILSD-2 is similar to ILSD-1 but also with risk consideration; i.e., with the risk damage cost included in the optimization procedure and a risk equation supplied by the user. The user may choose either ILSD-1 or 2 as he (she) wishes and according to the available data. This user's guide provides the necessary information to use the computer program. Data preparation for various options to fit different engineering situations is presented.U.S. Department of the InteriorU.S. Geological SurveyOpe