When floodwaters recede, affected a

When floodwaters recede, affected areas are often blanketed in silt and mud. The water and landscape can be contaminated with hazardous materials, such as sharp debris, pesticides, fuel, and untreated sewage. Potentially dangerous mold blooms can quickly overwhelm water-soaked structures. Residents of flooded areas can be left without power and clean drinking water, leading to outbreaks of deadly waterborne diseases like typhoid, hepatitis A, and cholera.

But flooding, particularly in river floodplains, is as natural as rain and has been occurring for millions of years. Famously fertile floodplains like the Mississippi Valley in the American Midwest, the Nile River valley in Egypt, and the Tigris-Euphrates in the Middle East have supported agriculture for millennia because annual flooding has left millions of tons of nutrient-rich silt deposits behind.

Most flood destruction is attributable to humans' desire to live near picturesque coastlines and in river valleys. Aggravating the problem is a tendency for developers to backfill and build on wetlands that would otherwise act as natural flood buffers.

Many governments mandate that residents of flood-prone areas purchase flood insurance and build flood-resistant structures. Massive efforts to mitigate and redirect inevitable floods have resulted in some of the most ambitious engineering efforts ever seen, including New Orleans's extensive levee system and massive dikes and dams in the Netherlands. And highly advanced computer modeling now lets disaster authorities predict with amazing accuracy where floods will occur and how severe they're likely to be.

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Ketika floodwaters menyusut, daerah yang terkena dampak yang sering ditutupi Lumpur dan Lumpur. Air dan lanskap dapat terkontaminasi dengan bahan-bahan berbahaya, puing-puing yang tajam, pestisida, bahan bakar dan limbah yang tidak diobati. Mekar berpotensi berbahaya cetakan dapat cepat membanjiri struktur direndam air. Penduduk daerah banjir dapat dibiarkan tanpa listrik dan air minum bersih, menyebabkan wabah mematikan tertular penyakit seperti tipus, hepatitis A, dan kolera.Tapi banjir, terutama di dataran sungai, sebagai alam seperti hujan dan telah terjadi selama jutaan tahun. Dataran yang subur terkenal seperti lembah Mississippi di Midwest Amerika, lembah Sungai Nil di Mesir dan lembah Tigris-Euprates di Timur Tengah telah mendukung pertanian selama ribuan tahun karena banjir tahunan telah meninggalkan jutaan ton kaya gizi silt deposito di belakang.Kebanyakan banjir kerusakan disebabkan oleh manusia keinginan untuk tinggal di dekat garis pantai yang indah dan di lembah sungai. Memperparah masalah adalah kecenderungan untuk pengembang untuk pengurukan dan membangun pada lahan basah yang sebaliknya akan bertindak sebagai buffer alam banjir.Many governments mandate that residents of flood-prone areas purchase flood insurance and build flood-resistant structures. Massive efforts to mitigate and redirect inevitable floods have resulted in some of the most ambitious engineering efforts ever seen, including New Orleans's extensive levee system and massive dikes and dams in the Netherlands. And highly advanced computer modeling now lets disaster authorities predict with amazing accuracy where floods will occur and how severe they're likely to be.