Some areas flood more than others due to a combination of natural geography and human development.

Understanding these factors can help you prepare your property for potential flooding.

TL;DR:

• Geography plays a big role: low-lying areas, proximity to water bodies, and soil type affect flood risk.
• Urbanization increases flood risk through impermeable surfaces and altered drainage.
• Heavy rainfall events are becoming more common, overwhelming drainage systems.
• Poorly maintained infrastructure can worsen flooding.
• Knowing your flood zone is the first step to protecting your home.

Why Do Some Areas Flood More Than Others?

Have you ever wondered why a neighbor’s street stays dry while yours becomes a temporary river? It’s not random. Several factors combine to make certain areas much more prone to flooding than others. Understanding these reasons is key to protecting your home and family.

Geography: The Lay of the Land

The most obvious reason is elevation and proximity to water. Areas located in low-lying regions, floodplains, or near rivers, lakes, and coastlines naturally have a higher chance of experiencing floodwaters. Think of a bowl; water naturally collects at the lowest points. Coastal areas are also vulnerable to storm surges from hurricanes and other coastal storms.

Soil Type Matters

The type of soil in an area also impacts how much water it can absorb. Sandy soils drain quickly, while clay-heavy soils absorb water much slower. If an area has soil that doesn’t absorb water well, and you get a lot of rain, the water has nowhere to go but to pool and run off, increasing flood potential. We found that areas with compacted soil are even less absorbent.

Urbanization and Its Impact

As communities grow, so does the impact on natural drainage. When land is developed, many natural surfaces like forests and fields are replaced with impermeable surfaces. Think of roads, parking lots, and rooftops. These surfaces don’t allow rainwater to soak into the ground. Instead, the water flows rapidly over them, collecting into storm drains. These drains can quickly become overwhelmed, leading to street flooding.

The Role of Storm Drains

Storm drain systems are designed to carry rainwater away. However, in heavily developed areas, these systems can be undersized for the amount of runoff. They can also become clogged with debris like leaves, trash, and sediment. When storm drains can’t keep up or are blocked, water backs up, causing flooding in streets and even homes. This is a common reason for flash floods in urban environments.

Climate Change and Weather Patterns

We are seeing more frequent and intense weather events globally. Research shows that heavy rainfall events are becoming more common in many regions. These deluges can dump more water than local drainage systems or natural water bodies can handle, leading to increased flooding. Warmer temperatures can also contribute to more intense storms.

Sinking Land (Subsidence)

In some coastal or delta regions, the land itself is sinking. This process, called subsidence, can be caused by groundwater extraction or natural geological processes. As the land sinks, it effectively becomes lower relative to sea level, making it more susceptible to flooding, especially during high tides or storm surges. This exacerbates the problem of rising sea levels.

Human Infrastructure and Maintenance

The quality of our infrastructure plays a vital role. Dams, levees, and storm sewers are built to manage water. However, if these structures are not properly maintained or are built to inadequate standards, they can fail or become less effective. Poor maintenance of drainage ditches and culverts can also impede water flow, contributing to localized flooding. We found that a lack of regular upkeep is a common culprit.

Altered Waterways

Sometimes, rivers and streams are straightened, widened, or channelized for development or flood control. While intended to manage water, these alterations can change how water flows downstream. This can sometimes increase flood risk in areas that were not previously prone to flooding. It disrupts the natural flood plains.

Understanding Your Flood Risk

Knowing your flood risk is the first step to protecting your property. Many areas that flood are not in designated high-risk flood zones. This means flood insurance might not be required by lenders, but the risk is still present. It’s important to investigate your specific area. Understanding local topography and drainage patterns can give you a better picture.

Flood Zones Explained

Government agencies often map flood zones based on historical data and projected risks. These maps help identify areas with a higher likelihood of flooding. However, these maps are not always perfect and can be updated. Even if you are not in a high-risk zone, flooding can still occur. It is wise to consider your property’s unique characteristics.

The Importance of Insurance

Homeowners insurance typically does not cover flood damage. You often need a separate flood insurance policy. Understanding what your policy covers is essential. Many homeowners have insurance questions after damage occurs, but it’s best to be prepared beforehand. Knowing the difference between flood and water damage insurance can save you a lot of stress later.

What About Water Category?

Not all water damage is the same. Flood damage can often involve Category 3 water, also known as “black water.” This is highly contaminated water that can come from sewage backups or natural flooding. This type of water poses serious health risks. It’s crucial to understand the dangers associated with different types of water when dealing with a flood event.

When to Call a Professional

After a flood, the damage can be extensive. It’s important to call a professional right away to assess the situation. They have the expertise and equipment to handle water extraction, drying, and restoration. Delaying professional help can lead to secondary damage, like mold growth. We found that prompt action is key to minimizing damage and costs.

Preventing Further Damage

Once the initial water is removed, the next major concern is preventing mold. Mold can start to grow within 24-48 hours. Proper drying and dehumidification are critical. If you are unsure about the process, it’s best to consult with restoration experts. They can guide you on how to prevent mold growth after water leaks.

Documentation for Claims

When dealing with flood damage, it’s vital to document everything for insurance purposes. Take photos and videos of the damage before any cleanup begins. Keep records of all expenses related to the damage and repairs. This is crucial for documenting damage for a claim and avoiding issues with your insurer. It also helps if there are any disputes about the extent of the damage.

When Claims Get Denied

Sometimes, flood damage claims can be denied, even by government agencies like FEMA. This can happen for various reasons, such as insufficient documentation, not having the required insurance, or the damage not meeting the policy’s criteria. Understanding why some flood damage claims get denied by FEMA can help you prepare your claim more effectively.

Conclusion

The reasons why some areas flood more than others are complex, involving a mix of natural geography, soil conditions, urban development, weather patterns, and infrastructure. By understanding these factors, you can better assess your personal flood risk and take steps to protect your home. If your property experiences flood damage, remember that prompt action is essential. Des Moines Damage Mitigation Pros is a trusted resource for navigating the challenges of water damage and restoration, helping you get your property back to normal safely and efficiently. We recommend you do not wait to get help when water damage strikes.

What is a floodplain?

A floodplain is a flat or nearly flat land adjacent to a stream or river that is subject to flooding. These areas are naturally designed to absorb excess water during heavy rainfall or snowmelt events. Development in floodplains increases the risk of property damage and can worsen flooding downstream.

Can development make flooding worse?

Yes, development can significantly worsen flooding. Replacing natural landscapes with concrete and asphalt creates impermeable surfaces. This prevents rainwater from soaking into the ground, leading to increased surface runoff. This runoff can overwhelm storm drains and natural waterways, causing more frequent and severe flooding.

Is flood insurance necessary if I don’t live near a river?

Yes, flood insurance is often necessary even if you don’t live near a river. Many floods are caused by heavy rainfall inland, not just coastal or riverine flooding. We found that a significant percentage of flood insurance claims come from areas outside of designated high-risk flood zones. It’s a good idea to investigate your property’s specific flood risk.

How quickly can mold grow after a flood?

Mold can begin to grow as quickly as 24 to 48 hours after water damage occurs. If materials like drywall, carpets, or wood remain wet for an extended period, mold spores can take root and spread. This is why rapid water extraction and thorough drying are critical steps in the restoration process to prevent mold growth after water leaks.

What is the difference between flood water and regular water damage?

Flood water, especially from natural events, is often considered Category 3 water, meaning it is highly contaminated with bacteria, viruses, and other pathogens from sewage or standing water. Regular water damage might be Category 1 (clean water) or Category 2 (gray water). The contamination level of flood water presents more significant health risks inside damaged homes and requires specialized cleanup procedures.

John Tomko

John Tomko is a highly respected, licensed damage restoration expert with over 20 years of hands-on experience in property recovery. Known for his technical precision and authoritative industry knowledge, John specializes in helping homeowners and businesses navigate the complexities of catastrophic loss. He holds an extensive portfolio of advanced credentials, ensuring every project meets the highest standards of safety and excellence.

𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀:
John is an IICRC-certified specialist in Water Damage Restoration, Applied Microbial Remediation (Mold), Applied Structural Drying, Odor Control, and Fire and Smoke Restoration.

𝗕𝗲𝘀𝘁 𝗣𝗮𝗿𝘁 𝗼𝗳 𝘁𝗵𝗲 𝗷𝗼𝗯:
John finds his greatest fulfillment in restoring peace of mind. He prides himself on being a steady, empathetic guide for clients during their most stressful moments of property recovery.

𝗙𝗮𝘃𝗼𝗿𝗶𝘁𝗲 𝗣𝗮𝘀𝘁𝗶𝗺𝗲:
When he isn’t on-site, John enjoys restoring vintage furniture and spending time outdoors with his family.

About the Author

Des Moines Damage Mitigation Pros Team

Licensed Damage Restoration Expert