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Stormwater Drainage Design
General Background Information
In 1968, the U.S. Congress passed the National Flood Insurance Act, which created the National Flood Insurance Program (NFIP). The NFIP was designed to reduce future flood losses through local floodplain management and to provide protection for property owners against potential losses through an insurance mechanism that allows a premium to be paid for the protection of those most in need. The creation of the NFIP represented a major shift in Federal strategy from previous structural flood-control and disaster relief programs.
As part of the agreement for making flood insurance available to a community, the NFIP requires the community to adopt floodplain management ordinances that meet certain minimum requirements intended to reduce future flood losses. The community official or agency responsible for floodplain management in a community may be able to provide information that would be useful to a requester. This official or agency usually is responsible for engineering, public works, flood control, or planning in the community as well.
- Letter of Map Amendment (LOMA)
A letter from DHS-FEMA stating that an existing structure or parcel of land that has not been elevated by fill (natural grade) would not be inundated by the base flood.
- Conditional Letter of Map Amendment (LOMA)
A letter from DHS-FEMA stating that a proposed structure that is not to be elevated by fill (natural grade) would not be inundated by the base flood if built as proposed.
- Letter of Map Revision by Fill (LOMR-F)
A letter from DHS-FEMA stating that an existing structure or parcel of land that has been elevated by fill would not be inundated by the base flood.
- Conditional Letter of Map Revision by Fill (CLOMR-F)
A letter from DHS-FEMA stating that a parcel of land or proposed structure that will be elevated by fill would not be inundated by the base flood if fill is placed on the parcel as proposed or the structure is built as proposed.
- Bridges and culverts
- Open Channel systems
- Dams, levees and reservoirs
- FEMA Map revisions and submittals (LOMR’s)
- Drainage master plans
- Stormwater drainage studies
- Floodplain management programs
- Flood control
- Army Corp of Engineers Permitting and Surveys
- Channel restoration
- Water Quality Sampling and Test Reports
- Curb and gutter design
- Above and below ground storm water detention structures
- Bridges, culverts and open channel design
- Erosion Control Design
- Flumes, weirs and spillways
- Wastewater treatment
- Watershed protection
- Wildlife habitat