# tgaw, lesson 2, floods

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tgaw, lesson 2, floods

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• BIG PICTURE: What is a drainage basin?

Learning OutcomesWHAT: Identify what a drainage basin is.

HOW: By describing the key features of a drainage basin.

WHY: So I can analyse the Mississippi drainage basin.

• Activate: What is a drainage basin?A drainage basin is the area of land drained by a river and its tributaries. A tributary is a small river that feeds into the main river.

Today you are going to create your own drainage basin!

• Cut out the template.Make sure you cut up the vertical line.

• Using a brown crayon, shade around the circumference of the circle.

• Using a blue crayon, shade the left triangle, draw some blue lines running from the top of the triangle and branching out towards the edge of the circle.

• 1234567

• Watershed the area of high land forming the edge of a river basin. Source where a river begins. Mouth where a river meets the sea. Confluence the point at which two rivers meet. Tributary a small river or stream that joins a larger river. Channel this is where the river flows. Drainage Basin this is the area of land drained by a river and its tributaries. 1You will now need a pen. Number the following features on your template.234567

• Stick the glued triangle under the shaded triangle, so it fits neatly.

• Open your book to a double page. Glue the triangle and the bottom sides of the diagram. Stick this firmly across the cease of the book. The tip of the triangle should correspond to the crease.

• It should look like this!

• Watershed the area of high land forming the edge of a river basin. Source where a river begins. Mouth where a river meets the sea. Confluence the point at which two rivers meet. Tributary a small river or stream that joins a larger river. Channel this is where the river flows. Drainage Basin this is the area of land drained by a river and its tributaries. 1234567Give your diagram the title River Basin.Write neatly the numbers and corresponding definitions into your book.

• Homework: Produce a River Fact File on the Mississippi, including the following items:What are the names of its tributaries?Where is its source?Where is its mouth? How long is the river?What are the problems of living next to a river?

• Watershed