For the purpose of analysis, the 12 original soil fertility categories were collapsed into five categories (high, moderate, low, very low, lime-rich) and the 6 original soil drainage categories were collapsed into three (freely draining, impeded drainage, naturally wet).
Ogie et al.'s [51] study emphasised on flood mitigation infrastructure, whereby it is crucial to remove accumulating floodwater from low-lying areas where drainage is naturally poor due to a very low slope gradient.
The study provides a simple and straightforward method for detecting freshwater priority areas based on endemism and threat, and represents a starting point for integrating freshwater and terrestrial conservation in representative and biogeographically consistent site-scale conservation strategies, that may be scaled-up following naturally linked drainage systems.
Drainage tiles buried beneath many naturally poorly drained agricultural fields in the Midwestern U.S. are believed to "short circuit" pools of NO−3-laden soil water and shallow groundwater directly into streams that eventually discharge to the Mississippi River.
This paper also evaluates the water quality impacts of naturally occurring acidic drainages into SBs, as several acidic seeps with pH in the range of 5 6 and having high dissolved concentrations of metals (Fe, Mn, Mg and Ca), sulfate and phosphate were observed draining into the SBs.
The spills contain many volatile components in acid mine drainage, which include the most acidic naturally occurring (i.e. not in a laboratory) water on Earth.
Tench were introduced in large parts of China during the 20th century (Walker and Yang 1999; Huang et al. 2001), most probably from the Itrysh River drainage in northern China where tench naturally occur (Fig. 1).
Planting on a slope or in a raised flower bed can help with drainage — in these cases, water will naturally run away from the iris.
Aluminium occurs naturally in some rocks and drainage from mines.
And four years after the Flood Defence Act, which requires housebuilders to create developments which ensure rainwater runs off naturally – rather than clogging up already overloaded drainage systems – it seems clear that Defra no longer has the staff to ensure the legislation is enforced.
Sand was chosen because it is naturally available and abundant, has excellent absorption, drainage and water-holding ability as well as act as permeable reactive barrier to trap organic pollutants (Wang et al. 2001).
