This paper describes estimation of stream channel geometry with multiple regression analysis of GISderived watershed characteristics including drainage area, catchment-averaged precipitation, mean watershed slope, elevation, forest cover, percent area with slopes greater than 30 percent, and percent area with north-facing slopes greater than 30 percent. Results from this multivariate predictor ...

Some of the highest losses of nitrate to surface waters come from drained agricultural land. Given previous this article studied for Belgian farming conditions (i) the effect of subsurface drainage density on nitrate losses and (ii) the economics of nitrate emissions, using the nitrogen version of DRAINMOD (Brevé et al., 1997 a and b). DRAINMOD (Skaggs, 1997) was used to simulate the performanc...

OBJECTIVE To determine what practices are used by hospitals to prevent ventilator-associated pneumonia (VAP) and, through qualitative methods, to understand more fully why hospitals use certain practices and not others. DESIGN Mixed-methods, sequential explanatory study. METHODS We mailed a survey to the lead infection control professionals at 719 US hospitals (119 Department of Veterans Af...

In agricultural lands, high nutrient levels of nitrogen, phosphorus and potassium are very important due to the high need of plants. By improving the nutrient content of sodium soils, the fertility and growth of the plants improve. Accordingly, in order to investigate the effect of underground drainage on soil quality in Khuzestan region, this experiment was carried out in a completely randomiz...

Abstract The purpose of underground methane drainage technology is to prevent disasters and enable the efficient use coal mine (CMM), sealing depth a key factor that affects performance drainage. In this work, layouts in-seam crossing boreholes are considered analyze stress distribution failure characteristics roadway surrounding rock through numerical simulation field investigation determine r...

There are human and animal health concerns related to drainage systems because nutrients, especially nitrogen and phosphorus, can contaminate water supplies. A field study was conducted on consolidated paddy fields of Sari Agricultural Sciences and Natural Resources University, Northern Iran (36.3°N, 53.04°E), to determine the effect of subsurface drain depth and spacing on nitrogen (N) and pho...

Altogether 327 valleys and their 314 cross-sectional profiles were analyzed on Mars, including width, depth, length, eroded volume, drainage and spatial density, as well as the network structure. According to this systematic analysis, five possible drainage network types were identified such as (a) small valleys, (b) integrated small valleys, (c) individual, medium-sized valleys, (d) unconfined...