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Premium member Presentation Transcript TYPES OF DRAINAGE PATTERNS : TYPES OF DRAINAGE PATTERNS Over time, a stream system achieves a particular drainage pattern to its network of stream channels and tributaries as determined by local geologic factors. Drainage patterns or nets are classified on the basis of their form and texture. Their shape or pattern develops in response to the local topography and subsurface geology. Drainage channels develop where surface runoff is enhanced and earth materials provide the least resistance to erosion. The texture is governed by soil infiltration, and the volume of water available in a given period of time to enter the surface. If the soil has only a moderate infiltration capacity and a small amount of precipitation strikes the surface over a given period of time, the water will likely soak in rather than evaporate away. If a large amount of water strikes the surface then more water will evaporate, soaks into the surface, or ponds on level ground . On sloping surfaces this excess water will runoff. Fewer drainage channels will develop where the surface is flat and the soil infiltration is high because the water will soak into the surface. The fewer number of channels, the coarser will be the drainage patternDENDRITIC DRAINAGE PATTERN: DENDRITIC DRAINAGE PATTERN A dendritic drainage pattern is the most common form and looks like the branching pattern of tree roots. It develops in regions underlain by homogeneous material. That is, the subsurface geology has a similar resistance to weathering so there is no apparent control over the direction the tributaries take. Tributaries joining larger streams at acute angle (less than 90 degrees).IMAGES OF DENDRITIC PATTERN: IMAGES OF DENDRITIC PATTERNTRELLIS DRAINAGE PATTERN: TRELLIS DRAINAGE PATTERN Trellis drainage patterns look similar to their namesake, the common garden trellis. Trellis drainage develops in folded topography like that found in the Appalachian Mountains of North America. Down-turned folds called synclines form valleys in which resides the main channel of the stream. Short tributary streams enter the main channel at sharp angles as they run down sides of parallel ridges called anticlines. Tributaries join the main stream at nearly right angles. The rectangular drainage pattern is found in regions that have undergone faulting.IMAGES OF TRELLIS PATTERN: IMAGES OF TRELLIS PATTERNRADIAL DRAINAGE PATTERN: RADIAL DRAINAGE PATTERN The radial drainage pattern develops around a central elevated point. This pattern is common to such conically shaped features as volcanoes. The tributary streams extend the headward reaches upslope toward the top of the volcano .IMAGES OF RADIAL PATTERN: IMAGES OF RADIAL PATTERNRECTANGULAR DRAINAGE PATTERN : RECTANGULAR DRAINAGE PATTERN The rectangular drainage pattern is found in regions that have undergone faulting. Streams follow the path of least resistance and thus are concentrated in places were exposed rock is the weakest. Movement of the surface due to faulting off-sets the direction of the stream. As a result, the tributary streams make shape bends and enter the main stream at high angles.IMAGES OF RECTANGULAR DRAINAGE PATTERN: IMAGES OF RECTANGULAR DRAINAGE PATTERNPARALLEL DRAINAGE PATTERN: PARALLEL DRAINAGE PATTERN Parallel drainage patterns form where there is a pronounced slope to the surface. A parallel pattern also develops in regions of parallel, elongate landforms like outcropping resistant rock bands. Tributary streams tend to stretch out in a parallel-like fashion following the slope of the surface. A parallel pattern sometimes indicates the presence of a major fault that cuts across an area of steeply folded bedrock. All forms of transitions can occur between parallel, dendritic , and trellis patterns.IMAGES OF PARALLEL DRAINAGE PATTERN: IMAGES OF PARALLEL DRAINAGE PATTERNPRESENTED BY:: PRESENTED BY: GEOGRAPHY PRESENTATION PRESENTED TO : Mrs . Supriya Nandurkar . AMI BADANI – 2 SAKSHI BHALOTIA – 4 SAMIDHA MANTHANWAR – 6 KHYATI KATKORIA – 19 DIMPLE MANTHANWAR – 23 SHRUSTI PATEL – 32 THANKING YOUHave a fun with this ppt submit ur project ….. With no tension …: Have a fun with this ppt submit ur project ….. With no tension … If u r satisfied the contact my facebook account . Search @ dhananjay manthanwar on facebook nd twitter.or linkdin .thanking u 4 looking or my website @ google seach my name You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.