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. However, the underlying condition, if it is known, should be treated. A watershed represents all of the stream tributaries that flow to some location along the stream channel. Classification of Drainage Patterns Geology Page Contact Us; Sign in. Parallel drainage patterns form where there is a pronounced slope to the surface. Rectangular Drainage The drainage pattern marked by right-angled bends and right-angled junctions between tributaries and the main stream is known as rectangular drainage. Tributary streams tend to stretch out in a parallel-like fashion following the slope of the surface.
Trellis drainage is characteristic of folded mountains, such as the in North America and in the north part of. In a dendritic system, there are many contributing streams analogous to the twigs of a tree , which are then joined together into the tributaries of the main river the branches and the trunk of the tree, respectively. Deranged Pattern This is an uncoordinated pattern of drainage characteristic of a region recently vacated by an ice-sheet. In a trellis pattern, the river forms a net like system and the tributaries flow roughly parallel to each other. In Centripetal patterns are produced where drainage converges on a single outlet or sink, as in some craters, eroded structural domes with weak cores, parts of some limestone country, and enclosed desert depressions. Many such water channels form a trellis.
Granuloma annulare is characterized by nonscaly, annular plaques with indurated borders, typically on the extremities. Subcutaneous granuloma annulare is characterized by large, skin-colored nodules that may be as deep as the lower dermis or subcutaneous fat. Drainage channels develop where surface runoff is enhanced and earth materials provide the least resistance to erosion. The Tamar Kosi, a left bank tributary of the Kosi River, the upper Rapti a tributary of the Ghaghra River , the Rapti another one , the left bank tributary of the Gandak River etc. This pattern resembles the veins of a leaf. Patients with generalized granuloma annulare have more widespread involvement, usually with 10 or more lesions. Spontaneous resolution is less common in these patients than in patients with localized granuloma annulare, and remission in fewer than three to four years is unlikely.
The most common clinical form is localized granuloma annulare, which accounts for approximately 75 percent of all cases. Pityriasis rosea—fawn-colored patch with fine scale along the border. Read on to learn some common types of drainage patterns, such as: dendritic, deranged, centripetal and trellised. Drainage patterns A drainage system is described as accordant if its pattern correlates to the structure and relief of the landscape over which it flows. However, other conditions may present with much the same appearance. This system forms on uniformly sloping surfaces, for example, rivers flowing southeast from the Aberdare Mountains in Kenya. The mature dissected Sonapet dome of Uttaranchal presents an ideal example of annular drainage pattern.
Though dendritic pattern is independent of structural and lithological controls but almost uniform lithology presence of same type of rocks in extensive area presents most ideal condition for the development of dendritic drainage pattern. The result is a stream system in which streams consist mainly of straight line segments with right angle bends and tributaries join larger streams at right angles. The cultures may take two to four weeks for growth. . It is difficult to gauge the effectiveness of any of these treatment options, considering the variability of the disease. The herald patch is generally a singular, ovoid macule located on the trunk and can range from 2 to 10 cm in diameter. Drainage patterns: Discordant drainage patterns.
A deranged drainage system is a drainage system in drainage basins where there is no coherent pattern to the rivers and lakes. Source: Centripetal The centripetal drainage pattern is just the opposite of the radial as streams flow toward a central depression. The classic example is the. Unlike tinea corporis, the lesions of granuloma annulare have no scaling or associated vesicles or pustules. Topical and systemic antifungals are usually curative. Among the systemic antifungal agents available, griseofulvin Grisactin , terbinafine and itraconazole Sporanox are effective.
The melting of the glaciers left land with many irregularities of elevation and a great deal of water to collect in the low points, explaining the large number of lakes which are found in. The master consequent streams emerge at the top of the dome and rediate in all directions down the slope like radial drainage pattern whereas tributary streams develop in the clefts formed due to erosion of soft beds, assume actuate shape and join the master consequent streams and thus annular drainage pattern is formed. Most cases persist for approximately nine months. Trellised drainage patterns are generally formed in the regions of cuesta topography where hard beds become escarpments and soft beds are eroded to become valleys or lowlands. In areas of uniform rock, with little distortion by folding or faulting, the rivers develop a random branching network similar to a tree. Over time, a stream system will achieve a particular drainage pattern to its network of stream channels and tributaries as determined by local geologic factors.
Urticarial vasculitis is not actually urticaria but a leukocytoclastic vasculitis that can mimic urticaria clinically, with the exception that the lesions may persist up to three to five days. Pityriasis rosea is characterized by small, fawn-colored lesions distributed along skin cleavage lines. It tends to develop on the flanks of a dome or a volcanic cone. While patients with tuberculoid leprosy have only a few organisms, those with lepromatous leprosy have abundant bacteria. This pattern is typical in the western and southwestern portions of the United States where basins exhibit interior drainage. Hazaribagh plateau, Parasnath hill, Panchet hill and Dalma lava upland all in Jharkhand have issued radial drainage pattern. Parallel drainage pattern Parallel drainage pattern A parallel drainage system is a pattern of rivers caused by steep slopes with some relief.