Question

Flooding activity online Compatibility Mode Saved Picture Tools joykaffenber Design Layout References Mailings Review View Help Format AaBbCel AaBbC AaBbCcl AaBbCcl Aa Heading 1 Paragraph Font Styles GLY 120This Dangerous Earth Flooding Activity The Corps of Engineers Presents: H:0 Overload Assignment: Floodplain Management Details: You are the developer of a new community and must decide where to construct the following: a city park, a hospital, and a self storage business. The locations chosen for each construction site should correspond with an appropriate level of flooding risk. King River is near your site and is known for periodic flooding. You will be provided with a topographic map of your development area, a stream gage, and a flood frequency graplh showing the 10, 50, and 100 year flood gage readings. Identify the floodplain for each flood frequency and show the proposed locations for your construction projects Materials Required: 2 different colored pencils and a regular pencil or pen 1. 0 on the Stream Gage (top of next page) corresponds to elevation 492 ft. The 10 year flood gage reading has been given to you. Determine the elevations of the 50, and 100 year flood gage readings using the gage and graph at the top of the next page. 10 Year: 498 ft (492 ft +6 50 Year: 100 Year 2. Now locate each elevation on the map provided (the 10 year floodplain [elevation of 498 ft] has been colored in already for you) and color the 50 year floodplain one color, and the 100 year another color. These floodplains indicate how hioh the water from the Kino R ner will rise d'innơ a lo sn nr 100 vear flnnlino ment The S00 d States)

Answer 1

Since the base elevation of the stream is 492 ft, and the height of the 50 year stream is 8 ft, the elevation of the 50 year flood is 500 ft. Since the height of the 100 year old flood is 10 ft, its elevation is 502 ft.

In the image below, the brown line roughly depicts the extent of the 50 year flood following the 500 contour line, while the green line depicts the extent of the 100 year old flood, following the 502 contour line.

The gray square depicts the proposed location for the hospital. The location is chosen for it high elevation from the river bank, combined with road access. The red square indicates the location for the self-storage business. This is chosen for its location away from the river bank. The green square depicts the location of the park. This location is chosen because, despite its proximity to the 100 year old flood line, the damage done by these floods is minimal, since parks contain mostly trees and grass, which can grow again without huge losses, as opposed to the hospital and the business, where flooding can cause damage to life and property.

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