Project Information
Project Description
The NAU department of Engineering and inspection has indicated that the Gammage, Cline Library, and Eastburn Education buildings have been experiencing flooding and resulting water damage. These building sites are susceptible to poor drainage conditions and can consequently suffer moderate flood damage during relatively minor flood events. In response, NAU’s Facility Services has re-graded and constructed a concrete channel in the parking lot behind Gammage this past summer (July 2016), in an attempt to alleviate flood damage at the given site, while the Cline Library and Eastburn Education sites are still in their original conditions. Accordingly, the new hydraulic infrastructure at Gammage will be analyzed for effectiveness while the existing drainage plan for the Eastburn Education and Cline Library buildings will be researched and revised to minimize flood impacts and drain the site area as efficiently as possible. Although the site area lies within the Federal Emergency Management Agency (FEMA) designated floodplain for the Rio De Flag, this drainage study will not include an analysis of the Rio De Flag’s 100-year flood plain.
Design Alternatives
Design Solution #1(Enlarge Pipe)
The first solution to the Cline Library/Eastburn Education storm drain would be to increase the size of the pipe to accommodate the 25-year storm. This process can be achieved through Manning’s Equation (Equation 3), using the Rational Method’s 25-year storm as the design flow, and then back calculating minimum pipe diameter, through the Hydraulic Radius and Cross-Sectional Area (both functions of pipe diameter).
Design Solution #2 (Green-roof)
The second solution to the Cline Library/Eastburn Education would be to reduce the surface runoff the storm drain receives. One possible design that could achieve that would be installing a green-roof [5] onto the Cline Library and Eastburn Education buildings. The installation of a green-roof can reduce surface runoff exponentially (Runoff Coefficient “C” reduction of .95 to .2
Design Solution #3 (Porous Pavement)
The third solution to the Cline Library/Eastburn Education storm drain would again be to reduce the surface runoff, but this time through the installation of porous pavement in the parking lot. Porous pavement can reduce runoff significantly (Runoff Coefficient “C” reduction of .95 to .5) at a much cheaper price than a green-roof
Topo Map
Gammage Topo Map
Cline Library/Easterburn Education Topo Map
Design Alternatives Cost
Team Cost
