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6-mon�h 1.0 <br />2-ycar 1.4 <br />10-year 2.1 <br />100-yoar 3.0 <br />Area <br />(ac�es) CN <br />Impervious 0.060 98 <br />Pervious Type 7 1.820 73 <br />Pervious Typc 2 U.000 73 <br />Pcrvious Type 3 0.000 73 <br />Wcighted Pervious 1.820 73 <br />TOTAL AREA: 1.680 <br />Area <br />Impervious <br />Pcrviaus Typc 1 <br />Pcrviou: Typc 2 <br />Perviou: Typc 3 <br />N.'eighted Pervious <br />TOTAL Ai:EA: <br />Arca, sq.ft: <br />Depth,inchus: <br />Infitlra[ion Ratc, in/hc <br />TS <br />Total Runolf Volumc, c <br />Peal; Runoff Rate, <br />Poak Underdrein Discharge Ratc, <br />Poak Storago, c <br />Peak Uvedlow ftatc, <br />Total Volume InfilUated, c <br />Tolal Valumc OvcriloWed, c <br />0202 98 <br />0.202 86 <br />0017 70 <br />0.279 84.A <br />0.421 <br />1062 <br />18.0 <br />1.0 <br />o: The runoll rafe �hown to �he Iefl represent, <br />full devclopment arca. This represents an <br />a largcr than ihat analyz^.d balow. <br />o�e: The basin �nalyzed here iepresenis �he <br />enlral Core (roadway, driveways and adjacenl <br />nA,caped areas in the front yards) ot �he site. <br />Exisling <br />(Full Developed Area) <br />918 2825 <br />0.02 0.05 <br />/lrca estimaled ba;ed upun total volume <br />�d by �tandard deplh ol 18' as lollcws' <br />��/7 Sit= 1062s1 <br />Developed <br />(Ceniral Core Only) <br />ca• 6-monih 2-year 10-ycai 100-year <br />6268 714 1.170 ?.054 3.278 <br />0.16 0.04 0.07 0.14 022 <br />� 0.02 0.02 0.02 0.02 <br />25 103 445 1,366 <br />�\\\ 712 1.168 1.785 1.89G <br />TnLir ]- R:�in Garden titura�_��. �I7::�hucnt & �)�crllun� Tablc <br />As shown in the row at the bottom of Table 1 labeled "Total Volume Overflowed, cu.ft." <br />all runoff from the four design storms is stored and infiltrated. Combined runoff from the <br />underdrain measures 0.02 cfs. <br />Three terraced compost filter berms provide a redundant facility to collect and detain <br />excess runoff from the rain gardens. in the event of prolonged rainfall, runoff that <br />exceeds the storage capacity of the rain gardens flows westerly to the compost filter <br />HEARTHSTONE LANE 8 DRAINAGE REPORT <br />APRIL 2006 <br />