FEMA No-Rise Certifications
We provide no-rise certification services for projects within FEMA-designated floodways, demonstrating that proposed development will not increase base flood elevations. Our work includes modification of effective HEC-RAS models, evaluation of existing and proposed conditions, and preparation of signed and sealed certifications for permitting. We focus on delivering clear, defensible results that meet regulatory requirements and keep projects moving forward.
What is a no-rise?
A no-rise is an engineering analysis based on the effective FEMA model (where applicable) that evaluates if a proposed project located within the regulatory floodway will create a rise in the 100-year water-surface-elevation (also called the base flood elevation, BFE). The root cause is tied to CFR 60.3(d)(3), and FEMA is black-and-white that the proposed project cannot cause any rise, out to the hundredths place (0.00 ft).
Are there guarantees?
There are no guarantees that your project will meet the no-rise requirement as defined by FEMA and the CFR. In fact, unless there is some offsetting factor (clearing of trees, cutting of fill material, etc), then a rise is likely. This is really a hydraulic analysis to determine IF there is a rise.
So what should I do??
First and foremost, any development in a floodway is going to prone to extreme flooding. This is a high-hazard flood area. Best practice is to find a new site. However, if that's not feasible, then adding activities that increase flood carrying capacity is highly recommended. Also, a consideration for "less impactful" development is important. For example, piling to a pier and boathouse are not a massive amount of flow blockage, whereas adding walls to the boathouse can block a lot of floodwaters.
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Red Mountain Engineering focuses on helping developers and homeowners achieve their goal in a flood safe, responsible manner. Reach out to us if you find yourself in need of a no-rise or hydraulic analysis.
