TY - GEN
T1 - Evaluating a spreadsheet model to predict green roof stormwater management
AU - Jarrett, A. R.
AU - Hunt, W. F.
AU - Berghage, Jr., Robert
PY - 2008
Y1 - 2008
N2 - The departments of Agricultural and Biological Engineering and Horticulture at the Pennsylvania State University have combined efforts to quantify the stormwater attenuation capabilities of extensive green-roof systems. This green-roof system consisted of a roof with a conventional flat-roof covering, a 0.5-in thick Enka-drainage layer, 3.5 in of porous medium, and Sedum spurium planted 3.0 in on center. The combined layers of this green roof had a maximum retention of 1.5 in and a saturated hydraulic conductivity of 0.43 in/s. The green roof system was modeled using a checkbook approach with daily rainfall depth as an input and ET and runoff as the outputs. The AGRR model was applied to 28 years (1976-2003) of rainfall data in Raleigh, NC, and showed that 45% of the annual rainfall volume (depth) can be retained on the green roof. Increasing the volume of storage does not improve the roofs ability to retain rain water. Providing only 0.125 in of roof storage will still cause over 30% of the annual rain depth to be retained on the roof.
AB - The departments of Agricultural and Biological Engineering and Horticulture at the Pennsylvania State University have combined efforts to quantify the stormwater attenuation capabilities of extensive green-roof systems. This green-roof system consisted of a roof with a conventional flat-roof covering, a 0.5-in thick Enka-drainage layer, 3.5 in of porous medium, and Sedum spurium planted 3.0 in on center. The combined layers of this green roof had a maximum retention of 1.5 in and a saturated hydraulic conductivity of 0.43 in/s. The green roof system was modeled using a checkbook approach with daily rainfall depth as an input and ET and runoff as the outputs. The AGRR model was applied to 28 years (1976-2003) of rainfall data in Raleigh, NC, and showed that 45% of the annual rainfall volume (depth) can be retained on the green roof. Increasing the volume of storage does not improve the roofs ability to retain rain water. Providing only 0.125 in of roof storage will still cause over 30% of the annual rain depth to be retained on the roof.
UR - http://www.scopus.com/inward/record.url?scp=78751656008&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78751656008&partnerID=8YFLogxK
U2 - 10.1061/41007(331)23
DO - 10.1061/41007(331)23
M3 - Conference contribution
AN - SCOPUS:78751656008
SN - 9780784410073
T3 - Low Impact Development: New and Continuing Applications - Proceedings of the 2nd National Low Impact Development Conference 2007
SP - 252
EP - 259
BT - Low Impact Development
T2 - 2nd National Low Impact Development Conference 2007: New and Continuing Applications
Y2 - 12 March 2007 through 14 March 2007
ER -