the watershed and down the opposite side of the watercourse. 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. 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. (Contact the local Soil Conservation service for watershed acreage.) calculate area. Area is a quantity that describes the size or extent of a two-dimensional figure or shape in a plane. (Show students the Figure 1 watershed, or a similar image). This will give you a rectan-gle on which to base the calcula-tion of area (See Figure 2 below). It may be Measure the roof to get the watershed area, the area from which water will run off. The image below shows how differences in roof slope do not change this building’s catchment area. StreamStats Application. The delineation appears as a solid line around the watercourse. A watershed is an area or region that is drained by a common river system. For example, if 5,000 sq. 2. Note places where two roofs form a valley, which will affect runoff because water will come from two sides. Eventually it will connect with the circle from which you started. 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. Learn More Generally, surface water runoff from rain falling anywhere in this area At this point you have delineated the watershed of the wetland being evaluated. Draw the general shape of the pond on paper (graph paper works best). 3. 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. ... Often in hydrology, we talk about the hydrology of a watershed. ft. of roof area is directed onto 3,000 sq. Multiply length (peak to eave) by width to determine square footage. Calculate the regional water balance equation using conservation of mass. ft. of lawn area then the Capture Ratio would be 3,000 / 5,000 or 60%. Related Surface Area Calculator | Volume Calculator. 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. 1, 2. To calculate how … 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. CN = overall curve number for the watershed. Calculating the size, or area, of a lake can be done a couple of different ways. 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