Classification of Catchment Areas 6. The catchment area is drawn to scale and the position of these 6 stations are plotted on it. Specific catchment area is used to calculate saturation and saturation excess overland flow in hydrological models such as TOPMODEL (Beven and Kirkby, 1979) and, along with other topographic indices, to calculate erosion and landsliding in many other models. Convert inches into feet by diving by twelve. Following basic data are required for flood computation studies. Hydrologic Processes The multiplication either calculates annual totals, an average rainfall event, or a storm rainfall amount producing heavy downpours. Hydrology. With the flow direction you can calculate flow accumulation. Data Required; Maps & Plans: Catchment Area Plans Scale 1:50,000 or 1:25,000 showing contour lines I-Flood Studies. Hydrometry. It finds considerable application in urban drainage designs and in the design of small culverts and bridges. The Upper Cauvery catchment drains an area 10,619 km 2 in the north-western region of the Cauvery catchment. CATCHMENT AREA The area of land draining into a stream or a water course at a given location is known as catchment area. The method accounts for translation only and does not include storage. Time-area method is based on the concept of time-area histogram, i.e. A catchment has an area of 150 ha and a runoff/rainfall ratio of 0.40.If due to a 10 cm rainfall over the catchment a stream flow at the catchment outlet lasts for 10 h, the average stream flow in the period is chsrf.org. Hydrology is the science of occurrence, movement and distribution of water above/below the land surface or in the atmosphere. GE2229 WATER AND THE ENVIRONMENT River Basin The interactions between hydrology and hydraulics (e.g. It is essential to have a good understanding of the catchment hydrology and develop reliable and robust models to ensure improved water resource management in such highly water-stressed catchments. a) What is the size of the catchment area? Catchment Area [raster] Catchment Height [raster] Catchment Slope [raster] Total accumulated Material [raster] Accumulated Material from _left_ side [raster] Accumulated Material from _right_ side [raster] … q = KA x …(3.9) where, q = magnitude of the peak runoff . There was no advantage from including stream length. Meaning of Catchment Area 2. chsrf.org. chsrf.org. It is the science and practice of water flow measurement. File: PDF, 8.65 MB. Hydrology -Collection of formulas- (Aid for the Exam and the Assignments) Zurich, 2011. Time (min) 3Discharge (m /s) 0 0 15 4.5 30 10 45 12.5 60 11 75 9 90 6.5 105 4 120 2.5 General: Brief History of the Project giving salient features related to the Dam & spillway. b) Calculate and plot the hydrograph for a 60 minute rain with an effective intensity of 10 mm/h. Relation of Catchment Area with Its Length 4. Please read our short guide how to send a book to Kindle. a histogram of contributing catchment subareas (segmentations of the catchment). Step7: Multiply the areas found in Step 6 by the average precipitation in the area. Karst Topography 7. In hydrology, the drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle, because the majority of water that discharges from the basin outlet originated as precipitation falling on the basin. Remark This formulary is meant to be of assistance in working on the exam and the exercises. Hydrological Cycle . Basic Data/ Information Required for Hydrological Design. 19.3 Cook’s Method. Let there be 3 stations outside the catchment, but in its neighborhood. A : Catchment area in km² Source: HP5:1989 (Azmi and Zahari, 1989) 2.2 Features of the Rational Method The Rational Method is generally considered to be one of the best available flood estimation procedures for small urban and rural catchment areas. Your formula should look something like log10(CatchmentArea) After these steps, your catchment area should look something more like Figure 14. Sizing a Catchment Area – The size of the catchment area or roof will determine how much rainwater that you can harvest. VVR111 – Hydrology and Aquatic Ecology • Find below the discharge values for a 30 min Unit Hydrograph. Figure 14. The time-area method of hydrologic catchment routing transforms an effective storm hyetograph into a runoff hydrograph. The catchment area is the area from which rainfall is collected. 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