## how to calculate watershed area ◂ Voltar

Learn More To calculate how … At this point you have delineated the watershed of the wetland being evaluated. Measure the roof to get the watershed area, the area from which water will run off. where: A = total watershed area (mile 2). StreamStats Application. ft. of roof area is directed onto 3,000 sq. Eventually it will connect with the circle from which you started. ft. of lawn area then the Capture Ratio would be 3,000 / 5,000 or 60%. (Show students the Figure 1 watershed, or a similar image). 1, 2. 3. This will give you a rectan-gle on which to base the calcula-tion of area (See Figure 2 below). It may be Draw a rectangle on the pond shape that would approximate the area of the pond if some water was eliminated and placed onto an equal amount of land. ... Often in hydrology, we talk about the hydrology of a watershed. Area is a quantity that describes the size or extent of a two-dimensional figure or shape in a plane. Draw the general shape of the pond on paper (graph paper works best). Optional: Calculate the amount of rain that falls on the watershed by finding out the average rainfall and multiplying the value by the watershed area. CN = overall curve number for the watershed. 2. Generally, surface water runoff from rain falling anywhere in this area For example, if 5,000 sq. Note places where two roofs form a valley, which will affect runoff because water will come from two sides. The area is based on the “footprint” of the roof, which can be calculated by finding the area of the building and adding the area of the roof’s overhang. The image below shows how differences in roof slope do not change this building’s catchment area. StreamStats is a Web application that provides access to an assortment of Geographic Information Systems (GIS) analytical tools that are useful for water-resources planning and management, and for engineering and design purposes. calculate area. The Capture Ratio is the ratio of the pervious area receiving the runoff (such as a lawn area) to the impervious area that generates the runoff. Note logical places for downspouts, like building corners. You can estimate the size by treating the lake as a the closest geometric figure, such as a circle, rectangle or triangle, or you can try to directly count the square footage of the lake by using graph paper on a scaled area map. the watershed and down the opposite side of the watercourse. (Contact the local Soil Conservation service for watershed acreage.) It can be visualized as the amount of paint that would be necessary to cover a surface, and is the two-dimensional counterpart of the one-dimensional length of a curve, and three-dimensional volume of a solid. Multiply length (peak to eave) by width to determine square footage. Write down those dimensions. Calculating the size, or area, of a lake can be done a couple of different ways. A watershed is an area or region that is drained by a common river system. area; B, the basin lag factor, which is the basin length divided by the square root of the channel slope; C, the basin length in miles; D, the main channel slope in feet per mile; E, the total impervious area, in percent of the basin area; and F, the basin Related Surface Area Calculator | Volume Calculator. scale of the map and longitude and latitude marks to calculate the size of your watershed then convert to acres. The delineation appears as a solid line around the watercourse. Calculate the regional water balance equation using conservation of mass. Two-Dimensional Figure or shape in a plane Conservation service for watershed acreage. have delineated the watershed of the being... Of area ( See Figure 2 below ) Conservation service for watershed acreage. s catchment area opposite of! Of area ( mile 2 ) connect with the circle from which you started the watercourse note places where roofs! 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