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Urban Hydrology and Hydraulic Design
Latest developments of urban hydrology and hydraulic design procedures for storm water management.Drainage planning is an approach that integrates both local and regional efforts to identify drainage conveyance and storage facilities based on hydrologic optimization and cost minimization individually and collectively. In general, the first six chapters cover the hydrologic procedures for rainfall and runoff predictions, and the next 12 chapters focus on hydraulic designs of urban channel, culvert, street inlet, sewer drain, detention basin, retention basin, infiltration basin, low impact designs, and storm water modeling techniques by various routing methods.Hydrology analyses are lengthy in...
Stormwater
Fully revised and updated, this second edition shows how to use new methods for controlling stormwater runoff. Contains up-to-date information on the latest developments in watershed and wetland detention, past management practices, new sizing calculations, as well as numerous complete designs based on actual, working detention facilities. On-the-job advice is aimed at civil, environmental and construction engineers, surveyors, stormwater managers, or anyone involved with runoff control.
Introduction to Stormwater
This professional reference tool combines basic concepts ofhydrology with the latest applications for landscape architectureand site engineering--including effective, eco-friendly, andpeople-friendly design methods for: * Wetlands construction * Groundwater recharge * Infiltration * Porous pavements * Stream restoration * Water harvesting Stormwater management is an essential component of all landscapearchitecture and site engineering projects. Introduction toStormwater helps solve environmental problems that arise in theprocess of planning, implementing, and evaluating the builtenvironment. This useful guide is of singular importance to landscapearchitects, civil engineers, architects, wetl...
Fate and Persistence of Pathogens Subjected to Disinfection
Disinfection of wastewater is a necessary treatment process for protecting the public from potential exposure to pathogenic microorganisms because many wastewater effluents are discharged into water bodies that may be used for recreation or as future drinking water supplies. Two common forms of disinfection are chlorine and ultraviolet (UV) light. However, microorganisms differ in their susceptibility to UV and chlorine disinfectants. It is necessary to understand how different classes of pathogens respond to UV and chlorine disinfection processes in wastewater to better develop strategies for optimizing the treatment of pathogens in wastewater. It is also recognized that water quality may i...
A New Tool for Measuring Biosolids Floc Strength
The ability to measure sludge network strength is important in sludge dewatering applications because it can be used to determine optimum polymer dose for conditioning to achieve good dewaterability. This was demonstrated in laboratory and in full-scale dewatering and thickening. The network strength increased as the polymer dose was increased, however, at the optimum dose a "drop" in the network strength occurred. Further research is needed to verify this concept at full scale and to provide a robust technology to the water and wastewater treatment industry. A second phase is sought through WERF funding. Rheometry was used for determining the sludge network strength. This report also formul...
Methods for Wastewater Characterization in Activated Sludge Modelling
Mathematical modeling is a useful tool for the design, analysis and control of wastewater treatment systems. The activated sludge process is one of the most common processes used in wastewater treatment, and therefore is a particularly important candidate for the application of mathematical models. In the 1980s, a task group organized by the International Association on Water Quality (IAWQ) developed a conceptual model of the activated sludge process, which has become an industry-wide standard for the development of computer-based activated sludge models. A recent version of the IAWQ model incorporates 19 components, 17 processes, and numerous rate and stoichiometric coefficients. It is difficult and costly to quantify all of the necessary coefficients for any given application of the model; consequently, it is important to identify the most critical wastewater and biomass components and the relevant coefficients to be quantified for the most common uses of the model. It is also important to provide guidance to potential model users on the use of default and/or estimated values for the remaining parameters.
Cyanide Formation and Fate in Complex Effluents and its Relation to Water Quality Criteria
Cyanide occurs in many industrial and municipal wastewaters and is often an expected constituent of typical treatment plant wastewater streams. However, a growing number of wastewater treatment plants (WWTPs) across the USA have detected cyanide in cholorinated effluents at levels exceeding influent concentrations. Because water quality criteria and related discharge limits are typically low some of these WWTPs periodically exceed effluent cyanide standards. Potential causes include cyanide formation during wastewater cholrination processes, the presence of interferences that cause false negatives, and false positives caused by artifacts of sample handling or analytical techniques. The possible causes of the apparent cyanide formation phenomenon were investigated in this study. This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below
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