نتایج جستجو برای: to design subsurface drainage systems
تعداد نتایج: 11054019 فیلتر نتایج به سال:
[1] Land drainage is common in peatlands. Artificially drained blanket peat catchments have been shown to have a significantly greater soil pipe density than intact catchments. This paper investigates the role of surface land drains in the enhancement of soil piping in blanket peats. The density of piping was found to significantly increase in a linear fashion with the age of the drainage. Thir...
[1] Recession flows in a basin are controlled by the temporal evolution of its active drainage network (ADN). The geomorphological recession flow model (GRFM) assumes that both the rate of flow generation per unit ADN length (q) and the speed at which ADN heads move downstream (c) remain constant during a recession event. Thereby, it connects the power law exponent of –dQ/dt versus Q (discharge...
Background The United States beef cattle industry has increased in value by 32% from 2002 to 2011 and is presently estimated to be worth $79 billion dollars (USDA, 2013). As livestock demand and production continue to rise, there is a greater need for increased forage production and improved forage quality. Missouri ranks second in the number of cows in the United States (USDA, 2014). Forage pr...
The aim of this research was to study how water use management can increases vegetation cover inrainwater catchment systems. The study was conducted through comparison of two methods of irrigation, i.e. traditional sub-surface drip irrigation and drip irrigation. Three soil samples were taken and analyzed from three locations in north of Sistan from a depth of 50 cm. A furrow was dug with a bas...
abstract this study aimed at investigating the impact of etymology strategy instruction on the development of vocabulary of iranian intermediate efl learners. etymology, knowledge of origin of words, roots, and affixes, has proved to be a controversial issue and a question of long debate with regard to its impact on the process of vocabulary learning. this study employed etymology strategy in ...
hydrochlorothiazide (hct) is a diuretic agent which is shown to be effective in the treatment of hypertension. literature reports have demonstrated that urinary excretion data may be used to assess the bioavailability of various formulations containing this thiazide. also hct consumption by the athletes is one of the drugs which should be regulated by world anti-doping agency (wada), because of...
the present study sought to investigate the impact of using mind-mapping technique instruction on female elementary efl learners reading comprehension; it also investigated their attitudes towards using mind-mapping technique as a tool to improve their reading comprehension. this study followed a quasi-experimental design with two intact groups as experimental, and control groups. the participa...
The development of building information modelling has facilitated the improvement cost and time management in panelized construction. This research proposes an automated method to design draft drainage systems BIM environment. proposed can improve efficiency, eliminate errors, reduce material waste. In order production efficiency at construction plant, pipe network is separated into smaller com...
Aflatoxins are secondary metabolites produced by Aspergillus flavus, A. parasiticus, A. tamari, A. bombycis and A. nomius species. Relative humidity (RH) is one of the most important parameters influencing the development of aflatoxins in pistachio orchards by Aspergillus species. The type of irrigation system affects density and frequency of the Aspergillus species in the soil. In the current ...
Identification and diagnosis of salt-affected soils in the Baixo-Açu irrigated perimeter, RN, Brazil
HIGHLIGHTS Spectral analysis is feasible to identify salinized areas. The most saline areas are lowlands with deficiency of natural drainage. studied soils in surface and saline-sodic subsurface.
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