Laserfiche WebLink
�� <br /> , � <br /> � ,i. �. r-mr:�. nNa COMPANY <br /> sunvFrna� rnr,�qrv�atnti f.ON9f11VCT10NMAN�OEMENT ' <br /> 291 I�h ilEwl I I nvE„SUI IF 8,EVERETT,WA88201 252-8734 <br /> ' DRAINA�E CALCULATIONS FOR STORA(3E VOLUME <br /> Bill Rigg Chestnut Street Apartment Pro,ject <br /> (�ob N34-1579) �I,� <br /> � ��� <br /> 1 . Runori' CoefPicient �5 �/�� <br /> Prom Table 1. Exiating - 0.50 i� lo4s �9 ba <br /> Proposed - 0.85 ��,�<<� v�l� <br /> Y� <br /> 2. Time of Concentration � ., <br /> From Figure 1. Existing - �� �. 1 + 10 = 11 m,h , i <br /> (oo <br /> Proposeu - 'o = 1 + 10 � 11 yv�� �� , <br /> �x 60 <br /> :{. Rainfall Intensity <br /> 10 year atorm. <br /> Figure 2. For t = .il minates <br /> i = J�75 I. �Z <br /> 4 . Tributary Area <br /> From Site Plan , 120 x 120 - 14 ,400 S.F. = 0. 33 Acrea <br /> 5. Allowable release rate <br /> Q = CiA - <br /> = 0.5 x 1.75 x . 33 = 0. 288 efs <br /> 6. Design Storm ' <br /> 10 year - <br /> Site is located in Area A of City <br /> 7 , Storage Volume : G , Cder = �• �S � � �N 2 <br /> �, 4)0 = Oallow : O; ZF�s = I .OZ� .j, . <br /> (14 Cder� 0.33x0•$5 l <br /> � T - _ zs t1/Z�- = -2sry?oz� � -zs +-4�.�7 = z1:8�1 <br /> Qe <br /> �' VS = 3�o�i •- 4DG�cT = C364�o.81$1) �4p��6Zb�(21�6��� <br /> � r+z5 ,� <br /> � : Ib �3� ��6 � �q�. sq = �785, 51 ������c i �kp. <br /> � \� �/ �( /� c, . <br /> C�.. V'r = V $ `�"�) (l..� rr) � � 65. 5 � K � 33x. �5 <br /> � - zzo . a3 �f <br /> � <br />