due to the important role of subsurface drainage in managing the ground water level, there are many researches focused on finding a new and more economic way to develop subsurface drainage technologies. lack of proper drainage system in northern iran has caused huge implantation of rice and it is impossible to have second implantation in this region. one reason of insufficiency of current drain...

Groundwater is important when there an insufficient spring water supply for daily needs. The population growth and expansion of the cities demand more water. Thimphu capital city Bhutan facing shortage in recent times due to urban growth. This study aims find potential area groundwater using Fuzzy Analytic Hierarchy Process. factors used this are elevation, slope, curvature, topographic wetness...

Tile drains and French drains are typically used to control subsurface drainage, especially on greens and fairways with shallow water tables or fine soil texture. Tile drains are defined as "drains constructed by laying drain tile with unsealed joints in the bottom of a trench which is then refilled," whereas French drains are a "type of drain consisting of an excavated trench, refilled with pe...

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...

The dynamic behavior of the basins evaluated by their morphometric parameters establishes a relationship with endogenous and exogenous factors earth that control modeling rocky massif weathering erosion processes. characterization these relationships can define degree affectation surfaces agents them as categorical element in definition scenarios within planning physical natural territory. This...

Yeo, C.J., Cameron, J.L., Maher, M.M., Sauter, P.K., Zahurak, M.L., Talamini, M.A., Lillernoe, K.D. and Pitt, H.A. (1995) A prospective randomized trial of pancreaticogastrostomy versus pancreaticojejunostorny after pancreaticoduodenectomy. Annals of Surgery; 222: 580-592. Objective: The authors hypothesized that pancreaticogastrostomy is safer than pancreaticojejunostomy after pancreaticoduode...