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c <br />Sunrise Servir,es•Drain�gc Swcly <br />5. DGTGNTiON HYDRAULIC RCSULTS (conL) <br />E1vIERGCNCY SPILL1i�AY: <br />According to Watenvorks printout for a 12" riser in ihe printout pages (at EI = <br />463.0), a Qdev100 = 0.165 cfs flow will overflow the pond nt elevntion EI < <br />463.05 at an approximatc spilhvay depth of O.US Feet ;�nd will flow safely to the <br />� rock lir�ed downstream ch�nnel iF the orifices are plugged. <br />]n conclusion, the proposed broad notch weir is adequctte to safely relcase flows in <br />excr:ss of the Q100 developed if necessaiy. It is properly sized to function as an <br />emcr�r.�cy over(7o�v. <br />C <br />BMP E3.35 T�SC TRAP SIZING & ANALI'SIS <br />A small temporary pond is requircd for a si�c th;u is less than 3A acres in sizc <br />based upon the following fornwla: <br />( <br />As = 1.2 QZ / Vsed <br />Where As = trap surface arca <br />Q2 = 2-Year design [lo�v = I Iydrogriph #5 = 0.068 cCs <br />� Vsed = design particle settling velocity = 0.0096 fdsec <br />Minimum sediment storage depth is 1.5 feet belo�v the outict elevation. The outlet <br />is a i�rforated CMP riser with �vashed gravcl cone. The Pond shall to have a 3: l <br />minimum length ro width ratio. <br />� As = 1.2 (0.068) / 0.0009G ft/scc = S� sf <br />L = 3*W <br />A = L* W= 3�V': W= 3W^2 = 85 <br />� �V(maximum) _ (85/3)^0.5 = 5.32 fee� <br />L(m�mmuw) = 3* 5.32 = 1GA feet <br />D (rninimum) = l.� feet <br />The proposed temporary pond is more than adequatc with a proper riscr device to <br />l address the sedimentatian requirements of this project. A large portion of the <br />con:;tructiot: area will be graveled early in sequence durin� the consuur.tion <br />climi�� :tine much of thc erosion concerns. <br />t <br />�ersrewN encrveeiis, in�c ��� r�aar:cn•:oi �m, <br />� 3 <br />