The hierarchy of models applicable to transient free surface problems of ground water ̄ow to drains is discussed. The model choice is related to drain type and dewatering stage. Flow pattern is illustrated to vary with decrease of the water table. Simulation of drains and corresponding boundary conditions are discussed. # 2000 Elsevier Science B.V. All rights reserved.

Researchers have documented the flow of so-called drugs of abuse, such as cocaine, methamphetamine, and ecstasy, in rivers and streams from Venice, Italy, to Florence, Ore. However, new research published in ES&T (DOI 10.1021/es800768h) shows that conventional drinking-water treatment successfully removes these drugs and others considered to be more benign, such as caffeine and nicotine. The re...

..*.. person who decides on removal. ,'A ... I l l IDrains provide a mechanical meanso removig matera that wod otherwise be harmful to the patient, and this may be pus, air, blood, 9\S,i.': '.:.: !_F '' ',:,.,, _,urme, or alimentary secretions. There are three main reasons for inserting drains-namely, to remove air and blood that wil delay healing and recovery, to drain abscesses, and to provid...

Study Design Systematic review. Objective Determine whether closed suction wound drains decrease the incidence of postoperative complications compared with no drain use in patients undergoing spine surgery for lumbar degenerative conditions. Methods Electronic databases and reference lists of key articles were searched up through January 22, 2015, to identify studies comparing the use of closed...

In these notes on drainage design procedure, three drain spacing formulae are considered suitable for designing sub-surface drainage systems. The Hooghoudt and the Kirkham-Toksoz formulae have been developed for steady state conditions and the Glover formula is applicable to the transient state condition. The steady state condition implies that the surface inflow is equal to the outflow through...

This research work presents the high-speed railway line (HSRL) case study constructed on soft soils deposits. The performance of improvement method combining both PVD’s (Prefabricated vertical drains) and surcharge preloading was evaluated herein based numerical simulation approach to predict induced deformations during HSRL construction phase. For this aim, PVD-assisted in situ measurement dat...

* Department of Surgery, College of Medicine, Hawler Medical University, Erbil, Iraq. Introduction Traditionally many surgeons advocate draining the neck routinely after thyroid surgery. Although several prospective randomized reports regarding the function of the drains in thyroid surgery have not justified their use, most surgeons still employ routine drainage of the thyroidectomy bed. The ma...