What is coincidental ponding?

As per the Fort Bend Drainage Criteria Manual ( –Design Criteria Assuming Coincidental Events), the maximum ponding level within the leveed area should not exceed the maximum water surface elevation associated with the 100-yr coincidental flood event computed in designing the internal drainage system of the levee area, including the required minimum freeboard of one foot and the pumping and storage capacity of the leveed system.

The coincidental ponding is determined from the coincidental probability of interior and exterior flooding and the capacity of pumps, drainage channels, and detention using the precipitation requirements of Atlas 14.

Show All Answers

1. What is Atlas 14?
2. Why is it necessary to adopt the Atlas 14 rainfall frequency values?
3. Who is affected by the implementation of Atlas 14?
4. What is coincidental ponding?
5. Are homes built to the new standards going to produce flooding in adjacent properties?
6. What is the City doing to mitigate the impact of increased rainfall frequencies?
7. How do I find out what areas of town will be affected?
8. Is my flood insurance rate going to increase?
9. Is my home at a higher risk of flooding?