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Delineating Watersheds

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Learn how to delineate a watershed.

Text of Delineating Watersheds

Slide 1

Terrain Modeling:

How to delineate a watershed using a printed topographical map

See NRCS handout: How to Read a Topographic Map and Delineate a Watershed

Mark the outlet (circle); Mark the high points adjacent to the stream or lake (xs)

Starting at the circle , draw a line connecting the x's" along one side of the waterbody . This line should always cross the contours at right angles (i.e. it should be perpendicular to each contour line it crosses). Practice Exercises; Watershed & Lakeshed Delineation

Follow the steps just discussed:

Mark the outletMark the high points adjacent to the water bodyConnect the marks; always cross a contour line at right angle (perpendicular).

Delineating Exercise 1

Start with a lakeshed; the land area contributing (draining) to a lake.

The lake is Four Point Lake in Cass County, near Hackensack, Minnesota

ADD OUTLET

MARK HIGH POINTS NEAR LAKE

CONNECT THE MARKS

Delineating Exercise 2

A watershed of a stream.

The small stream south of the Kadunce River, near Covill (just north of Grand Marais) in Cook County.

ADD OUTLET

MARK HIGH POINTS NEAR StREAM

CONNECT THE MARKSRemember contour lines often point up stream; so near outlet make sure you dont include other near by very small streams

Lab 11

Terrain AnalysisBrush Valley Creek

Data, Instructions,& Videos on FR website

17

Brush Valley Creek, Houston Country, MNLab 11Two .pdf maps to turn in via WebVista

Pay careful attention to where you create your output files

Watch the File Names

Write them down as you create them20

3D Analyst

Hillshade

Viewshed

FillFlow DirectionFlow AccumulationSnap Pour PointWatershed

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