Terrain Modeling: How to delineate a watershed using a printed ...

Terrain Modeling:How to delineate a watershed using a printed topographical mapSee NRCS handout: How to Read a Topographic Mapand Delineate a Watershed

Mark the outlet (circle); Mark the highpoints adjacent to the stream or lake(“x’s”)Starting at the circle , draw a lineconnecting the “x's" along one side ofthe waterbody . This line shouldalways cross the contours at rightangles (i.e. it should be perpendicularto each contour line it crosses).

Practice Exercises; Watershed & Lakeshed DelineationFollow the steps just discussed:•Mark the outlet•Mark the high points adjacent to the water body•Connect the marks; always cross a contour line at rightangle (perpendicular).

Delineating Exercise 1Start with a “lakeshed”; the land area contributing(draining) to a lake.The lake is Four Point Lake in Cass County, nearHackensack, Minnesota

ADD OUTLET

MARK HIGH POINTSNEAR LAKE

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Delineating Exercise 2A watershed of a stream.The small stream south of the Kadunce River, nearCovill (just north of Grand Marais) in Cook County.

ADD OUTLET

MARK HIGH POINTSNEAR StREAM

Remembercontour linesoften point upstream; so nearoutlet make sureyou don’t includeother near by verysmall streamsCONNECT THEMARKS