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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />Freeboard: A factor of safety usually expressed in feet above a certain flood level. <br />Freeboard compensates for the many unknown factors (e.g., waves, ice, debris, etc.) that <br />may increase flood levels beyond the calculated level. <br />Forbs: Vegetation that does not consist of trees, grass or shrubs. Forbs are typically <br />associated with flowering plants <br />Geographic Information System (GIS): Computer databases of georeferenced <br />information on the cities various resources. <br />Global Positioning System (GPS): Network of satellites used to map and identify <br />locations on the earth. <br />Hydric Soil: Soils that are saturated, flooded, or ponded long enough during the growing <br />season to develop anaerobic conditions in the upper part. Hydric soil is one of the three <br />criteria that define wetlands <br />Hydrophytic Vegetation: Macrophytic plant life growing in water, soil, or a substrate <br />that is at least periodically deficient in oxygen as a result of excessive water content. <br />Hypereutropic: A very nutrient -rich lake characterized by frequent and severe nuisance <br />algae blooms and low transparency. <br />Intensity -Duration -Frequency (IDF) Curve: A graphical representation of the rainfall <br />intensity versus time of concentration for an area. The IDF curve is typically used in the <br />Rational Method of storm sewer design to determine design rainfall intensity in inches <br />per hour. The following IDF curve is taken from the Minnesota Department of <br />Transportation Drainage Manual and applies is used in the rational method of storm <br />sewer design for the Ramsey Area. <br />Section XI <br />March 20, 2015 Page 75 <br />