Example metrics: Slope, Mean Value in Watershed; Elevation, Mean Value in Watershed; Flow Accumulation, Mean in Watershed; Why relevant: These indicators can be used to characterize watershed conditions for interpreting other RPS indicator data and results. 116 APPENDIX D: WATERSHED DELINEATION STEP 5: Check the slope of the landscape by locating two adjacent contour lines and determine their respective elevations. Watershed is that land area which drains or contributes runoff to a common outlet. It is usually calculated as the elevation difference between the endpoints of the main flow path divided by the length. Average Watershed Slope C3D How to NRCS Iowa 1 3/24/2014 Overview: Determine the average watershed slope of a surface. The size of a watershed (also called a drainage basin or catchment) is defined on several scales—referred to as its Hydrologic Unit Codes (HUC)—based on the geography that is most relevant to its specific area. Formerly, the term watershed was used for the divide of a drainage basin. Watershed characteristics such as size, slope, shape, drainage density, land use/land cover, geology and soils, and vegetation are important factors affecting various aspects of runoff. Like a funnel directing sand into a bottle, a watershed directs water from the surrounding land into a river, bay, lake, etc. It reflects the rate of change of elevation with respect to distance along the principal flow path. A surface model that is goes beyond the limits of the drainage area is used as the starting point. Other purposes of watershed management A watershed can be small, such as a modest inland lake or a single county. 5.4.1.3 Basin Slope: Watershed/basin slope affects the momentum of runoff. Watershed managers can play important roles in preventing landslides by making appropriate land management decisions. Since the UN conference on water at Mar del Plata, Argentina in 1977, however, the term watershed has come to mean also the drainage basin itself [].Accordingly, “watershed is defined as any surface area from which runoff resulting from rainfall is collected and drained through a common point. slope stability and therefore increase the risk of landslides. The slope is calculated as the change in elevation, along a straight line, divided by the distance between the endpoints of that line. to define a watershed. Watersheds cover all of the earth's land. ADVERTISEMENTS: vi. This process of subdivision can continue until very small, local Meaning of Watershed Management: The word “watershed” introduced in 1920 was used for the “water parting boundaries”. That is, the entire drainage area of a major river like the Merrimack can be considered a watershed, but the drainage areas of each of its tributaries are also watersheds. Note, however, that landslides caused by tectonic processes cannot be prevented or ameliorated through watershed management. a. Each tributary in turn has tributaries, and each one of these tributaries has a watershed. It includes the degree of slope, length of slope, mean slope of the land surface and areas of watershed falling under various slope groups. Watershed average slope (Alvard -Horton’s) d i =distance between two subsequent contour lines l i =length of the average elevation line between two subsequent contour lines •local slopes i = Δh i /d i vs basin slope, •local slopefor approximately rectangular areas between two subsequent contour lines of difference h: ⤷ where a i Surface Drainage: On drainage features of watershed the following informations are included for describing the physical features of watershed. 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