I am posting my question in two parts. Can a geologist Expert answer these quest

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I am posting my question in two parts. Can a geologist Expert answer these questions for me.

Thaanks.

Floods Application.

The Federal Emergency Management Administration (FEMA) prepares flood maps for most areas of the United States. As a geologist working for an insurance company, you need to know how flood zone maps relate to flood risk and insurance rates. To complete your work, you will use a Flood Insurance Rate Map (FIRM), which is a map that shows the different flood hazard zones within a community. As you can see in the accompanying chart, insurance rates vary widely depending upon the map zone that a property is located within.

Floods occur when rivers overflow their banks due to increased water flow, which can be caused by intense rainfall or snow melting upstream. As a geologist working with risk-assessment scenarios, you know that a 100-year flood has a 63% chance of occurring in any 100-year period of time, while the same chance exists for a 500-year flood level occurring in any 500-year period of time.

To complete your work, you will use the links on the left, which will help you

·         Understand that a site’s flooding risk can be determined by using maps from the Federal Emergency Management Administration (FEMA),

·         Understand that flood insurance premiums are determined by using flood insurance rate maps and characteristics about the property, and

·         Determine the flood insurance premium for a site by using a flood insurance rate map of the area and a schedule of premiums from FEMA.

Part A - Flood zones

Flood zones are designated by the 100-year and 500-year flood boundaries. The prior indicates a greater risk for flooding. Sites located within a zone compared to sites located on a zone boundary vary for risk. Review the accompanying map and the content provided at the Legend link in the introduction to identify which sites are located in which zones and how that relates to flood risk. Learn more about each neighborhood by clicking on its name on the city map located at theMap link.

What does each zone designation mean for each neighborhood?

Select all that apply.

1. A majority of Riverside is safe from any flood smaller than the 500-year flood event.

2. Point Park lies within Zone A and has a low chance of being affected by flooding.

3. The Hazard City railroad on the south side of the river lies in Zone B and is only in danger of floods larger than the 100-year flood event.

4. All of Downtown is within Zone C and is relatively safe from flooding.

Part B - Flooding probabilities

Examine the map below, and determine the flooding probabilities. Check out the flood zone Legend and Map links for information that helps determine flood risk, such as slope, elevation, and stream/river proximity. Be sure to review the information below the map at the Map link.

What do the zone designations for each site mean for flood probability?

Select all that apply.

1. Site 2 has a greater probability for flooding than Site 1.

2. Site 1 has a greater probability for flooding than Site 3.

3. Because the elevation of Site 2 is less than the nearby base flood elevation, it will be at less risk for flood than if its elevation were above 838.

4. Site 3 has a high probability for flooding due to its elevation.

Part C - Flood insurance rates

Examine the zone map again and the rate chart that is provided in the introduction of this lesson to determine the flood insurance rates for the three sites indicated based on probability of flooding. Note that not all labels will be used.

Drag the appropriate labels to their respective targets. Not all labels will be used.

Part D - Rivers and elevation

On the Hazard City map, the blue feature running through Riverside and Ralston is a river system. Which direction is the river system flowing through Hazard City?C

Choose from (1, 2, 3, 4)

1. toward north

2. toward east

3. toward south

4. toward west

Insurance Cost Per Year for each $100,000 of property value* $301 Map Property Details Zone 7no one foot or more above base flood elevation Zone A Zone Aat base flood elevation $431 Zone A one foot or morv below base food one foot or more below base flood elevation $1251 Zone B no basement, previous flooding Zone Bbasement, previous flooding Zone B no basement, no previous flooding Zone B basement, no previous flooding Zone C no basement, previous flooding Zone Cbasement, previous flooding Zone C no basement, no previous flooding Zone C basement, no previous flooding Zone V Zone X no basement, previous flooding Zone Xbasement, previous flooding Zone X no basement, no previous flooding Zone X basement, no previous flooding $351 $441 $221 $246 $351 $441 $221 $246 $835 $351 $441 $221 $246 all properties (rates listed in this table are fictitious and do not represent actual insurance costs) insurance costs for a $200,000 home would be 2x the amount shown costs for a $50,000 home would be 0.5x the amount

Explanation / Answer

Part A:

1.A majority of Riverside is safe from any flood smaller than 500 year probablity because majority of the area has not experienced previous flooding

2.Point Park lies within zone A has a low chance of being affected by flooding could be due to the fact it is either above or at flood elevation level

3.The Hazard City railroad on the south side of the river lies in zone B and only in danger of flood events larger than 100 year flood event because it has not experienced previous flooding in the area

4. All of downtown is within zone C and is safe from flooding because it has not experienced cases of previous flooding as well as it is far from the source area of flooding that is river.

Part B: Flood zones are demarcated on the basis of 500 year as well as 100 year flood zones. The 100 year flood zones has a greater probablity of risk than 500 year flood zones. Each flood zone expose the risk due to flood.

1. Site 2 has greater probability of flood than site 1 because site 2 has experienced previous cases of flooding whereas site 1 could be above the flood elevation level.

2. Site 1 has greater probabity of flooding than site 3 because site 3 has not experienced previous cases of flooding and it is farther from the source of flood i.e river.

3. If the elevation of an area is above the flood elevation level it will be at lesser riskof flooding as compared to that area which is at or below the flood elevation level.

So in this case if the elevation of site 2 is above 838 i.e. above flood elevation level it will be at lesser risk of flooding as compared if it was nearby base flood elevation level.

4. No, Site 3 has a lower risk of flooding because it is farther from source of flooding that is river and also it has not expereinced previous cases of flooding ,the site A and site B are more prone to risk of flooding than site 3

Part 3:

Site 1 (within zone B): $441, $221 and $246

Site 2 (within zone A):$301, $1251

SIte 3(within zone C):$221,$246,$241

Part D: On observing the Hazard City map we can see than elevation contours are decreasing from 841 to 838 values which means that the elevation is decreasing from Palouse River to Clearwater River. We know that river flows from high gradient to low gradients i.e from higher slopes to lower slopes so this means that river is flowing towards east.

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