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<br />TOWNHOMES OF LAKE OWASSO
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<br />PROPOSED DRAINAGE
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<br />SCALE 1" ~ 200'
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<br />"TO POND" DRAINAGE A.REA
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<br />PROP. DRAINAGE AREA ~ 7.65 AG
<br />POND NWL = 910,0
<br />100>" RUNOFF VOLUME = 3,6810.= 2.35 AF
<br />100>" HWL '" 914
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<br />PROP. CN = 79
<br />CONNECTED IMPERV, ARE:A(CN~98) ~
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<br />"TO OFFSITE" DRAINAGE !>.REA
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<br />PROP, DRAINAGE AREA = 5.3 Ac
<br />LOW POINT = 893,8
<br />1 DO>" RUNOFF VOLUME = 2,65 In, =
<br />1 DO>" HWL = 903.5
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<br />PROPOSED RUNOFF RATES
<br />(RA TIONAL METHOD)
<br />100)1' RUNOFF RATE = 26.7 cr. = EXISTING RATE
<br />100>" RUNOFF RA TE ~ 6.1 cr. (TO OFFSITE)
<br />100>" RUNOFF RATE = 13,1 cf. (TO WETLAND)
<br />100>" RUNOFF RATE = 7,5 cr. (FROM POND TO WEKAND))
<br />PROP, ORIIINI\GE AREA = 20,2 I\G
<br />TIME OF CONCENTRA.TloN = 45 mln,
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<br />PROPOSED NURP POND
<br />VOLUME REOUIRED = 2,5/12 . 7,65 . ,55 - 0,88 AF
<br />VOLU ME PROV1DED = 0,93 AF
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<br />PROPOSED DETENTION POND
<br />VOLUME REQUIREQ = 0,74 AF
<br />VOLUME PROVIDED b 0,96 AF
<br />POND NWL = 910.0
<br />POND 100yr PEAK OUTFLOW = 7.5 cr.
<br />POND 100>" HWL = 9g,o
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<br />CHARLEs W. f't,OfiE Ccwsu.11NG~
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