The text mentions that the eastern part of the state is traditionally flood-prone. However, in recent years, western Uttar Pradesh has also experienced massive flood situations.

Eastern Uttar Pradesh is traditionally flood-prone due to several geographical and climatic factors. This region is located in the Gangetic plain, which is formed by the alluvial deposits of the Ganges and its tributaries. The combination of heavy rainfall, high discharge from the rivers, and the flat topography of the area makes it vulnerable to flooding. Here is a detailed explanation of why Eastern Uttar Pradesh is prone to floods:

1. Geographical Location:
- Eastern Uttar Pradesh is situated in the lower part of the Gangetic plain, which is a vast stretch of fertile land formed by the sedimentary deposits of the Ganges River.
- The region is crisscrossed by several major rivers, including the Ganges, Yamuna, Ghaghara, and Gandak, which contribute to the flooding during the monsoon season.
- The rivers in this region receive water from the Himalayan rivers and the runoff from the surrounding areas, leading to a significant volume of water flow.

2. Monsoonal Climate:
- Eastern Uttar Pradesh experiences a monsoonal climate characterized by heavy rainfall during the months of June to September.
- The region receives a substantial amount of rainfall during this period, which leads to an increase in the water level of the rivers.
- The excessive rainfall, combined with the already high water levels, often exceeds the carrying capacity of the rivers, resulting in floods.

3. Flat Topography:
- The topography of Eastern Uttar Pradesh is predominantly flat, with low-lying areas and floodplains.
- The lack of natural barriers or slopes in the landscape makes it easier for water to accumulate and spread over a larger area during floods.
- The flat terrain also hampers the drainage of excess water, causing it to stagnate and prolonging the duration of floods.

4. Human Interventions:
- Certain human activities have further increased the vulnerability of Eastern Uttar Pradesh to floods.
- Deforestation, encroachment of floodplains, and inadequate maintenance of river embankments have disrupted the natural flow of water and reduced the capacity of rivers to handle floodwaters.
- The construction of dams and barrages upstream can also contribute to the intensity and duration of floods downstream.

In conclusion, Eastern Uttar Pradesh is traditionally flood-prone due to its geographical location in the Gangetic plain, the monsoonal climate with heavy rainfall, the flat topography, and human interventions. These factors combined make the region susceptible to flooding, causing significant damage to lives, property, and agriculture.