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, <br /> „ . ; <br /> � <br /> � OUTLINE OF DRAINAGE DGTENTION CALCUATIONS (Continued) � <br /> GRAND AVENUE CONDOMINZJMS f <br /> NEAR THE INTERSECTION OF GRAND AVENUE AND 20th STREETS + <br /> � <br /> � <br /> � <br /> '1'HE MAXIMUM OUTFLOW FOR 'iHE 20 MINUTE 10 YEAR ..STORM I5 LESS THAN € <br /> 0.25 cfs. FOR SUB AREAS B AND C, 100� RETENTION IS PROVIDED BY � <br /> MEANS OF A 48 INCA DRY WELL. ` <br /> 7. DISCHAR(3E FOR SUH AREA A ENTERS THE COMBINED SYSTEM IN � <br /> URAND AVENUE. FOR SUB AREAS B AND C , THE CALCULATED INFILTRATION <br /> RATE FOR THE 20 MINUTE 10 YEAR RUNOFF IS 1,� OF THE MINIMUM <br /> AVAILABLE SOIL PERMEABILITY. <br /> 8. FOR EACH SUB AREA, DETAIL COMPUTATIONS ARE PROVIDED TO <br /> � DETERMINE THE ALLOWABLE AND FllTUR�RATES OF RUNOFF, AND THE <br /> EXPECTED RATE OF INFILTR�TION. SEE ATTACHFD PLANS AND CALCULATIONS <br /> FOA DETAILS. <br /> , I . <br /> . _ j. <br /> �: <br /> >a <br /> ; . <br /> C <br /> i <br /> E <br /> I <br /> P <br /> �I <br /> , ' j <br /> 4 <br /> y <br /> � <br /> � � <br /> � <br /> I .-+I <br /> �'I <br /> �Age 2 OP 2 <br />