the economic growth and development programs in iran call for particular attention for environmental quality control and protection through designing proper sewage treatment and disposal. to design such system, 'the frequency analysis of rainfall is required for the estimation of quantities of flows. there are few places in iran, with adequate rainfall data to permit frequency analysis, an...

Future projections provided by climate models suggest that the occurrence of extreme rainfall events will increase and this is evidence that the climate is changing. Because the design of urban drainage systems is based on the statistical analysis of past events, variations in the intensity and frequency of extreme rainfall represent a critical issue for the estimation of rainfall. For t...

BACKGROUND Aneurysmal subarachnoid hemorrhage (SAH) may be complicated by delayed cerebral ischemia, which is a major cause of unfavorable clinical outcome and death in SAH-patients. Delayed cerebral ischemia is presumably related to the development of vasospasm triggered by the presence of blood in the basal cisterns. To date, oral application of the calcium antagonist nimodipine is the only p...

sediment-related environmental problems pose a serious threat to sustainable land management in many developing countries, including iran. information regarding sediment sources represents a key requirement from the management perspective since identification of sediment sources is a precursor to the design of effective sediment management and control strategies. the fingerprinting approach has...

Surface and subsurface water collection in small seasonal rivers is very crucial, particularly in dry seasons. In this study a type of intake is introduced which acts as a river drainage network. An experimental model of the subsurface intake was constructed and the effective parameters such as upstream discharge, installation depth, and drain intervals were evaluated. The results showed that t...

Before 1900, Blacks typically occupied the swampy portions of New Orleans, Louisiana. As the city embarked on an ambitious Progressive Era public works project to improve drainage in the 1890s, it began to overhaul environmental conditions. This process, if carried out according to rational engineering principles, would serve the entire city equitably. At the same time as the improvements, Jim ...

OBJECTIVES To investigate the etiopathogenic role of sinus inflammatory disease in primary acquired dacryocystitis and other chronic obstructive diseases of the lachrymal drainage system. STUDY DESIGN Noninterventional controlled study. SETTING Tertiary care center. SUBJECTS AND METHODS Sixty consecutive patients with primary acquired dacryocystitis and other chronic obstructive diseases ...

To reduce the impact of stormwater pollution on the environment, operators in charge of urban drainage systems and waste water treatment plants need real-time predictions of pollutant concentrations during rainfall events. In this paper, this problem is addressed using nonlinear recurrent neural networks, which are used to simulate the rainfall-runo transformation, as well as the production and...

Recent research suggests future alterations in rainfall patterns due to climate variability, affecting public safety and health in urban areas. Urban growth, one of the main drivers of change in the current century, will also affect these conditions. Traditional drainage approaches using grey infrastructure offer low adaptation to an uncertain future. New methodologies of stormwater management ...

The urban drainage system is co-regulated by various governmental departments, who adopt different standards in designing the system, an attempt not conducive to prevention of water logging. This study took Zhongshan and Zhuhai as subjects, proposed Copula-based design a calculated most practical solution drainage, waterlogging rainfall based on Kendall’s Return Period, providing references for...