|PDH Online Course Description||PDH Units/Learning Units (Hours)Vincent D. Reynolds, MBA, PEThe largest contributor to drainage and surface runoff is the hydrologic cycle. During the hydrologic cycle precipitation falls to the ground as either rain or snow. Other causes of surface runoff are manmade. There are several methods available to calculate the flow rate of Stormwater; among those are the SCS and rational methods. Several variables are included in the rational method; among those are surface type, location of the site, and intensity of rainfall. Erosion occurs as a result of surface runoff. The effects of erosion can be reduced by implementing a design that can control the surface runoff such as rip rap, and stilling basins. Vegetation can also be used to control erosion. Vegetation acts by holding soil particles together and reducing the effects of erosion. This course will provide the reader with the knowledge that will aid in designing culverts and erosion control devices as safely and economical as possible. The course materials are based solely on the Army Corp of Engineers document “Drainage and Erosion Control.” This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials. NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website. AIA Members: You must take the courses listed under the category "AIA/CES Registered Courses" if you want us to report your Learning Units (LUs) to AIA/CES. If you take courses not registered with AIA/CES, you need to report the earned Learning Units (not qualified for HSW credits) using Self Report Form provided by AIA/CES.