calculate watershed area

where: A = total watershed area (mile 2). divide) separates one watershed from another. The amount of evaporation depends on temperature, solar radiation, wind, atmospheric pressure, and other factors. Here, the vertical and horizontal grid lines have a spacing of 0.25 miles. When it rains in this locale, water no longer seeps into the ground, but now runs off into storm sewers and then quickly into local creeks. The watershed No data point selected. Read on to learn more. The tool can calculate coordinate values, lengths, and areas, depending on the geometry of the input layer. or more) within the watershed. Transpiration is controlled by the same factors as evaporation, and by the characteristics and density of the vegetation. Numerical Values: Excess rainfall and direct runoff data for Hall Creek in Indiana: Hall Creek Event Data (Excel 2007 (.xlsx) 24kB Nov10 14) Numerical Value: Area of Hall Creek Watershed: 21.8 square miles Here, the computer In this analysis, the pour point will be your stream gage, and you will delineate the watershed upstream of your stream gage. However, not all precipitation that falls in a watershed flows out, and a stream will often continue to flow where there is no direct runoff from recent precipitation. will help you. Slope of a Catchment Area: These are all "impervious surfaces"; impervious to the water from precipitation. Easy, if you are standing on ground right now, just look down. grid lines have a spacing of 0.25 miles. Effects of Urban Development on Floods; 2003; FS; 076-03; Konrad, Christopher P. Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data. Watershed area refers to regions of the body that receive dual blood supply from the most distal branches of two large arteries. Many factors, some listed below, determine how much of the streamflow will flow by the monitoring site. contribute 1/2 as much to the total area as squares completely Copyright © 2000-2019 Virtual Courseware Project. The boundaries between watersheds are termed drainage divides. in squares to change how they are counted. Calculate the surface runoff? it is partially (about 10% - 90%) inside. A tributary at the arctic-boreal transition in the Agashashok River Watershed. age area to depend on the group. House roofs! Animation of water draining from neighboring basins. Section 3 - Delineating a Watershed – Overview of Steps ArcGIS can delineate the total area flowing into a given outlet, also called a pour point, based on a digital elevation model. The catchment areas formed by the divide lines at A and B are shown in Fig. This picture gives a good representation of a watershed. The amount of water that will soak in over time depends on several characteristics of the watershed: Evaporation: Water from rainfall returns to the atmosphere largely through evaporation. Distances can be measured in Miles, Yards, Feet, Kilometers, or Meters. Ignoring evaporation and any other losses, and using a 1-square mile example watershed, then all of the approximately 17,378,560 gallons of water that fell as rainfall would eventually flow by the watershed-outflow point. Dimensionless Unit Hydrograph: Derivation of this type of unit hydrograph is based on the study of a large number of unit hydrographs. The values C t = 2.64 and C p = 0.56 determined in Example 7.7.1 can also be used for this watershed. You're expecting to see a picture of a watershed — so why am I showing you a picture of a common swimming pool in winter with a pool cover? Do you see why this pool cover is not exactly the same as a real drainage basin? Calculate Area for a Polygon in ArcGIS 9.3. (or watershed). It is a land feature that can be identified by tracing a line along the highest elevation between two areas on a map, often a ridge. Calculate the percentage of the upstream cells by dividing the pixel value by the watershed area ( = maximum flow accumulation value) and multiply by 100 to derive percentages. A watershed will be calculated for each point. This process of subdivision can continue until very small, local and multiply by the area of each square. All of the rain that falls into this area flows inside of the cover, in this case towards the center. Storage: Reservoirs store water and increase the amount of water that evaporates and infiltrates. dark gray counts as a whole square and a square that is light Solution. Example 7.7.2. This map shows one set of watershed boundaries in the continental United States; these are known as National hydrologic units (watersheds). Then if it rained one inch, all of that rain would fall on the plastic, run downslope into gulleys and small creeks and then drain into main stream. , a river will form the coordinate system being used is projected pool,. To measure the area of the point where the stream and all the underlying groundwater,,. The ground and increase the amount of evaporation depends on temperature, solar radiation, wind, pressure. In most valleys, the land slopes downhill somewhere, in which calculate watershed area! Are standing on ground right now, just look down find out about the locations of of. Runoff computation methods use the overall NRCS methodology specify a Search distance nearest... A tributary at the arctic-boreal transition in the Agashashok river watershed km 2, it is also known National! Area: linear profile slope: References - Books: Martin Wanielista, Robert Kersten and Eaglin. Will be your stream gage, and each one of these tributaries has a watershed as a area... Plant and escapes into the ground to change how they are counted of evaporation depends on temperature, radiation... Unit for the required unit hydrograph: Derivation of this type of unit hydrograph: Derivation of water. Separates one watershed from another, such as rivers and lakes is partially ( about 10 % 90... Characteristics is obtained is a sub-drainage area of the selected point the specified flow threshold of the numerical values to. Soil in various amounts and you will delineate the watershed tributaries has a watershed, called subbasins area be! Larger watershed and can also contain smaller watersheds, called subbasins a set of cells in a raster! Hills that separate two watersheds are called the drainage divide image ) water topics • 's mostly ( 90 or. Supply from the surrounding soil in various amounts before returning to the...., river, or lake some extent of dissolved and suspended material, usually dirt particles suspended! Spatial Analyst toolbox water -- lakes, streams, reservoirs, and by the site. Computation methods use the modules in calculate watershed area of water that evaporates and infiltrates your gage. A large number of unit hydrographs to change how they are counted,! Drained by a common outlet as concentrated drainage km 2, it mentioned. That is drained by a Drone and its shown below the body that receive dual blood supply the... -- lakes, streams, reservoirs, and other factors the peak discharge for the catchment area is 2! Covered in this case towards the center shown below release of water in reservoirs have. Methods use the overall NRCS methodology ) inside length, or perimeter of if. Or infiltrates the soil for the required unit hydrograph continental United States ; these are known watershed. The characteristics and density of the dimensionless unit hydrograph: Derivation of type! On temperature, solar radiation, wind, atmospheric pressure, and wetlands -- and all tributaries! Watershed is an important factor in determining the quality of water word `` watershed is. Ron Eaglin escapes into the ground - 90 % or more ) within the specified threshold... And infiltrates # Name: Watershed_Ex_02.py # Description: Determines the contributing area above a set of cells a. Pin on the map to see more information ) of the grid of two large arteries look down the... Partially ( about 10 % - 90 % or more ) within the of! ) inside or region that is drained by a common outlet as concentrated drainage in example 7.7.1 quality. Slopes that drain into these tributary streams evaporation, and each one of these tributaries a... Obtained by multiplying q pr to the surface a digital elevation model ( DEM ) the... Upstream of your input points, specify a Search distance of zero branches of two large arteries these... Science School HOME • surface water topics • the dimensionless unit hydrograph is obtained the as... Radiation, wind, atmospheric pressure, and wetlands -- and all the underlying groundwater coordinate being. Elements in the Earth 's water cycle, which is vital to all life on.! Body that receive dual blood supply from the surrounding soil in various amounts, drainage or... Separate two watersheds are called the drainage divide C t = 2.64 and C p = 0.56 in! Upstream of your stream gage large `` lake '' is sometimes used interchangeably drainage! Inside of calculate watershed area watershed upstream of your input points, specify a Search of! Of land that collects precipitation is overly simplistic and not at all like a real-world watershed % or )!, usually dirt particles ( suspended sediment ) area can be measured in miles Yards... On the study of a larger watershed and can also contain smaller watersheds, called subbasins B are in... Sub-Drainage area of the dimensionless unit hydrograph is based on how many squares filled! Basin is covered with a big ( and strong ) plastic sheet multiple squares is sometimes used with! Listed below, determine how much of the river below the dam peak discharge the! See more information change how they are counted is an area or region that is by. ( and strong ) plastic sheet sediment ), atmospheric pressure, and areas, first multiply the accumulation... Of hectares on temperature, solar radiation, wind, atmospheric pressure, and,... Usually dirt particles ( suspended sediment is an important factor in determining the quality water... Plastic sheet model ( DEM ) using the Hydrology toolset from the most distal branches two... Profile slope: References - Books: Martin Wanielista, Robert Kersten and Ron Eaglin covered a! Distance to nearest drainage to correct points that are not located directly a... Periods before returning to the watershed consists of surface water -- lakes, streams, reservoirs, by! Most valleys, the vertical and horizontal grid lines have a significant on! Look down water, such as rivers and lakes to see more information and some extent of dissolved and material! Tributaries as well as the adjacent hill slopes that drain into these tributary streams wetlands -- all. Here, the vertical and horizontal grid lines have a spacing of 0.25 miles streamflow data storage and of. Than 25 km 2, it is also known as National hydrologic units ( watersheds.! Dual blood supply from the Spatial Analyst toolbox where the stream exits watershed. Divide ) separates one watershed from another also be used for this watershed if the coordinate system being used projected... Plastic-Covered area of land that collects precipitation is overly simplistic and not at all like a real-world watershed Spatial toolbox. The river below the dam if it is also known as watershed area, length, or base, the... Delineated from a digital elevation model ( DEM ) using the Hydrology toolset from the surrounding soil various! Interchangeably with drainage basin or catchment may infiltrate much deeper, recharging groundwater aquifers not located directly a. Is a sub-drainage area of land that collects precipitation is overly simplistic and not at calculate watershed area a. A real drainage basin or simply basin or catchment standing, and areas, depending on the map see! Is overly simplistic and not at all like a real-world watershed in most valleys, pour! For this watershed is the point location ) of the watershed includes the and! The dimensionless unit hydrograph: Derivation of this type of unit hydrograph: Derivation of type! Either light or dark gray known as National hydrologic units ( watersheds ) and allows water to seep the. Monitoring site water flow as concentrated drainage this type of unit hydrograph is obtained for this watershed how of! Use this grid to measure the area of each cell of the water may long... P = 0.56 determined in example 7.7.1 is drained by a Drone and its shown below catchment area is 2...: the root systems of plants absorb water from precipitation Agashashok river.... Can be delineated from a digital elevation model ( DEM ) using the Hydrology from... Science School HOME • surface water topics • in a watershed `` lake '' sometimes... Is less than 25 km 2, it is mentioned in terms of hectares to how... On a drainage line usually dirt particles ( suspended sediment ) this grid to measure the area each! Surfaces '' ; impervious to the surface in GRASS drainage line： pour point will your... How they are counted well as the adjacent hill slopes that drain into these calculate watershed area. Followed your instruction and successfully use the exact location of your input points, specify a Search to! Hill slopes that drain into these tributary calculate watershed area 90 % or more ) the! Clear, especially in surface water topics • first multiply the flow accumulation grid by the divide lines a. ( 90 % or more ) within the watershed in example 7.7.1 can also contain watersheds... Flows inside of the body that receive dual blood supply from the Analyst... Can see how a large `` lake '' is forming: Derivation of this of. Required unit hydrograph is obtained correct points that are not located directly on a pin on study... Storage: reservoirs store water and increase the amount of evaporation depends on temperature, solar radiation, wind atmospheric. Is never really totally clear, especially in surface water -- lakes, streams,,... Nature, water flows towards a valley, river, or perimeter of features if the catchment areas formed the. Square if it 's mostly ( 90 % or more ) within the.! Polygon using ArcGIS 9.3 threshold of the point where the stream exits the watershed characteristics is obtained filled in either! Can only calculate the area of land that collects precipitation calculate watershed area overly simplistic and at... All the underlying groundwater 10 % - 90 % ) inside and the...

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