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. Generally, surface water runoff from rain falling anywhere in this area (Show students the Figure 1 watershed, or a similar image). Write down those dimensions. This will give you a rectan-gle on which to base the calcula-tion of area (See Figure 2 below). Calculate the regional water balance equation using conservation of mass. Note places where two roofs form a valley, which will affect runoff because water will come from two sides. where: A = total watershed area (mile 2). Calculating the size, or area, of a lake can be done a couple of different ways. 1, 2. Area is a quantity that describes the size or extent of a two-dimensional figure or shape in a plane. A watershed is an area or region that is drained by a common river system. Measure the roof to get the watershed area, the area from which water will run off. To calculate how … the watershed and down the opposite side of the watercourse. 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 The delineation appears as a solid line around the watercourse. The image below shows how differences in roof slope do not change this building’s catchment area. 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. ft. of roof area is directed onto 3,000 sq. CN = overall curve number for the watershed. At this point you have delineated the watershed of the wetland being evaluated. 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. Learn More 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. It may be 3. Eventually it will connect with the circle from which you started. 2. Note logical places for downspouts, like building corners. scale of the map and longitude and latitude marks to calculate the size of your watershed then convert to acres. 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. Related Surface Area Calculator | Volume Calculator. StreamStats Application. 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