DATABASE
Consequence Data Calculations Descriptions
NLD Consequence Data Calculations Descriptions
The NLD provides information about the people and property behind each levee. This information is computer-generated and is developed by comparing each leveed area with national datasets from other federal agencies. However, if a risk assessment or levee review has been completed for a levee system, the values for population, property value, and number of buildings behind the levee may be updated to match those developed during the assessment to increase accuracy.
The following table explains the type of information collected for the area behind each levee and which external datasets are used to calculate the data.
| Consequence Data Field | Source Data | Reported Result |
|---|---|---|
| People | USACE National Structures Inventory 2026 | Total population in the leveed area, includes Day and Night breakdown. |
| Property Value | USACE National Structures Inventory 2026 | Value of structure and contents in dollars. |
| Buildings | USACE National Structures Inventory 2026 | Count of buildings. |
| Crop Acres | USDA National Cropland Data Layer 2022 | Crop type listed in acres. |
| Critical Structures | DHS Homeland Infrastructure Foundation-Level Data (HIFLD) Open 2023 | Critical Infrastructure. |
| Endangered Species | USFWS Threatened & Endangered Species 2023 | Threatened and Endangered Species. |
| Environmental Concern Facilities | EPA Facility Registry Service 2023 | List of Facilities in the leveed area |
| Communities | FEMA Communities Layer 2020 | List of communities recognized by FEMA as part of the Flood preparedness programs |
| Tribes | BIA Land Areas of Federally Recognized Tribes 2022 | List of Federally Recognized Tribes. |
