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2 .3 Project Data <br />Hydrological and structural data pertinent to the Project are summarized as follows. <br />2.3.1 !!Ydrological -- The hydrological analyses and flood discharges used in the <br />design of the Project were developed by the J.S. Army Corps of Engineers. This <br />information was reviewed by Greenhorne and 'Mara, Inc. This was accepted by <br />FMA, Boulder County, CWCB, and the Urban Drainage and Flood Control <br />District (UDD ) M' 1987_ The flood discharges in the study are Judged to adequately <br />reflect the year 2010 basin conditions so adjustments to the analysis are <br />unnecessary. <br />Peals discharges from the approximate 1 square mile drainage area upstrearn of <br />the property are sumnaari ed as follows: <br />10 year - 1,75 o efs <br />o year - 4,600 cfs <br />loo year- 6,100 cfs <br />Soo year -- 10,750 cfs <br />2.3.2 Physical - Iu,fonnation on the levee is as follows: <br />Levee. Deepe Pit <br />Year Designed <br />1979 <br />Year Constructed <br />1980 <br />Year Upgraded <br />1998 <br />Length 4 feet,, appro ately <br />Type Earthfill <br />Height of Top of Levee Above ground o - 1 +/- feet <br />Width at Top of Levee 12.7 - 22.8 +/- feet <br />Freeboard 4 feet plus <br />Maximum Side Slopes 3 horizontal: 1 vertical <br />Erosion Protection Riprap D50 = 9 " Depth =1 '' <br />Internal Drainage <br />Internal drainage includes a ditch and channel to collect surface <br />runoff from the area behind the levee and deliver the runoff to the <br />ouall at Viele Channel (see Figure 1). <br />(0075757 DMP1 3 <br />