Dendritic systems form in V-shaped valleys; as a result, the rock types must be impervious and non-porous. The two join at Devaprayag to form the mainstream known as Ganga. Angles are both more and less than 90 degrees. All of the precipitation rain or snow that falls within a drainage basin eventually flows into its stream, unless some of that water is able to cross into an adjacent drainage basin via groundwater flow. It is best displayed by streams draining a maturely dissected structural dome or basin where erosion has exposed rimming sedimentary strata of greatly varying degrees of hardness, as in the Red Valley, which nearly encircles the domal structure of the Black Hills of South Dakota.
In the summer season, the melting snows on the river heads keep the rivers flowing. In antecedent drainage, a river's vertical incision ability matches that of land uplift due to tectonic forces. Perhaps it's somewhere i … n between. During wetter portions of the year, these streams feed ephemeral lakes, which evaporate away during dry periods. A parallel pattern also develops in regions of parallel, elongate landforms like outcropping resistant rock bands.
It is an indicative of insequent streams flowing across horizontal and homogeneous strata or complex crystalline rocks offering uniform resistance to erosion. The main river, by sheer force, cuts the hard rock and flows down the slope forming an escarpment and thus a river gap is created. Mahanadi, Godavari, Krishna, and Kaveri flow into the Bay of Bengal. These streams resemble the spokes of a wheel or the radii of a circle. Dendritic drainage systems are not the only pattern in which water may form rivers, they are the most common.
Millions of pilgrims bathe in the Ganga, Yamuna and Godavari. Examples would be granite, gneiss, volcanic rock, and sedimentary rock that has not been folded. Drainage patterns depend on the and of the land. The rivers that occupy many glaciated valleys, including the gap ofdunloe, also have trellis pattern. There are five headstreams that join to form the mainstream. Geomorphologists and hydrologists often view streams as being part of drainage basins. The three main types of drainage patterns are illustrated in Figure 13.
They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land. This system forms on uniformly sloping surfaces, for example, rivers flowing southeast from the Aberdare Mountains in Kenya. Superimposed drainage develops differently: initially, a drainage system develops on a surface composed of 'younger' rocks, but due to denudative activities this surface of younger rocks is removed and the river continues to flow over a seemingly new surface, but one in fact made up of rocks of old geological formation. In Bangladesh, Ganga is known as Padma until it joins Brahmputra after which the combined river is called Meghna. The dendritic pattern is associated with the areas of homogeneous lithologies, horizontal or very gently dipping strata, flat and rolling extensive topographic surface having extremely low reliefs.
A drainage basin is the topographic region from which a stream receives runoff, through flow, and groundwater flow. Source: Centripetal The centripetal drainage pattern is just the opposite of the radial as streams flow toward a central depression. They can sometimes also be found on tops of mountains. Gradients are high, and profiles are ungraded. There are a number of holy shrines along the length of Ganga. The classic example is the Canadian Shield. The rivers Indus, Euphrates and Tigris, Nile and Hwang-Ho were the most significant aids in the growth and development of the Harappan Culture, the Mesopotamian, Egyptian and the Chinese civilizations.
Trellis drainage is characteristic of folded mountains, such as the Appalachian Mountains in North America. A terrace on the Similkameen River is shown in Figure 13. Such pattern is generally developed due to river capture fig 17. Barbed Drainage Pattern : Barbed drainage pattern, a rare kind of drainage pattern, is formed when the tributaries flow in opposite direction to their master streams. The drainage network of dendritic pattern becomes most extensive if the land surface is characterized by flat surface, level to gentle slopes and impermeable rocks. Trellis drainage patterns typically develop where sedimentary rocks have been folded or tilted and then eroded to varying degrees depending on their strength.
This pattern is formed by a series of streams which after emerging from surrounding uplands converge in a central low land which may be a depression, or a basin or a crater lake. The current base level is the river. This pattern is typical in the western and southwestern portions of the United States where basins exhibit interior drainage. Radial patterns form around isolated mountains such as volcanoes or hills, and the individual streams typically have dendritic drainage patterns. It's fairly easy to assess the ground to determine its ability to support runoff unless we're talking a graded lot. The Kathmandu valley of Nepal presents an ideal example of centripetal drainage pattern wherein the tributary streams of the Baghmati converge in the tectonically formed circular basin. The river is a useful highway of communication for about 600 km.