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Date frUNFtNINC Z i s /c7 E Tr' (235_�V)RNG,CT/v JG /�C ,�7W c572Gc:-�' (5EC i 4=14 46 G, � � q / T/ /`�G LQ AIC Td iPErN �PTav �s, - r � 2 5 V/ — do J� /itJ�4 i2 STEPAN & ASSOCIATES, Inc. z 930 South 336th Street Federal Way, Washington 98003 927-7850 682-4771 Project ^L ,//6'����` Job No. Subject Comp. Date _ Sheet —of Chkd. Dote t N(;IN[tR1NL l( SEI f INGInf fRINC STEPAN & ASSOCIATES, Inc. 930 South 338th Street Federal Way, Washington 98M 927-7850 682-4771 Project Job No. Subject Comp. Dote Sheet —of Chkd. Dote STREET /r ' TIME (MIN.) l - - - �►1� DESIWI F10W �i- l' °tt``�t"� c� r! - f t� !J� °� `��` �'` o ''v �~ �r kk of 1 t to, : r O �� `V v . V� ` �n ��vt J 4 r W: REMARKS Q? 4 �° �O +3 �� �/ • 4i t� LINE G.. FROM TO —21 Z '/0, 7 D, Z- n,q 71 G //,o n Z a ✓,� /, 2 3 s3 7 2 ¢ , o 9' D, S D, 22 410 P, z ,0 Z 3 2 RETURN RFOR • �' �.o.f. cwevc STORM SEWER COMPUTATIOK STEPAN & ASSOCASSOCW ES INC. 930 S0.336TH ST. SUITE A FEDERAL. WAY, WA 9M3 SY , DATt DESIO R ENo'R SHEET of Jos NO. 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Dote F NC IN ERINC PC) TA CU 4", C V uLUME eE7CXU = I,S 14GY;-Ile )C G31Z FT3�i44- = l.41 8 FT-' a0TTOvv% 181X 30/ = 54J r-T�" 1' DF_Gp ZQIX 36, = 8('4 r- VOL = 3 8Lq + Sys t (gay)( syo L0016 FT3 P,./ 411-A)3LE �y g YZE ZoT10M = t8� K 3'Jr Z' D EF. n = 30 ' x Ll Z' I ' F/z.iEE H 0A4i2D T" 'E sT E E P ES T 120►4 D S t_.0 P E a0t-ITP—I 3L r,N TO POMD*' G' IS LESS THA- N -304' So ay )NsPEGTlDH ND 21P P-OVP l'S /2,'=CXD, STEPAN & ASSOCIATES, Inc. Z 930 South 338th Street Federal Way, Washington 98003 927.7850 682-4771 Project Job No. Subject Comp. Dote Sheet 5'of Chkd. Date ENGINEERING Of s TEMPORARY SEDIMENT PONDS - NOMOGRAPH 1 TYPE IA STORM AREA W C B A HYDROLOGIC SOILS GROUP n- -91 90- - 9( 8s- - 8! BO- i -81 7S— -75 70- W —7C 05- 2 5 a 60 - - 64 55- -55 AOJ FT3/,4c- 500- c; ' i500- '. H L�liO- L-, - 25700- a 0 30oo- * BASED UPON A TIME OF CONCENTRATION OF .25 HR. a - O W 4000- ^1_ 4540_ O E+ cn 5000— (RUNOFF VOLUME) ii NMI F�!=ji!= FJA� WINK Ed E i raw a r won � a�� w -14 1 %f I \■, ITS ■S\■ \■ ■k1■Hilm/l■ ■a ■\i■1l■■■ ■■\■wa■■m SOIL EROSION POTENTIAL HYDROLOGIC GROUP K FACTOF Alderwood moderate -severe C .20 Beausite moderate-ver severe B .15 Bellingham slight C .24 Briscot slight C Buckley slight B/C Earlmont slight B/C Ed ewick slight B Everett moderate -severe A .10 Indianola moderate -severe A .24 Kitsap moderate -severe C .37 Klaus slight B .20 Neilton slight -moderate B .15 Newberg slight B Nooksack slight B — Norma slight B/C .28 Orcas none D .05 Oridia slight C Ovall Severe C .28 Pilct.uck moderate -severe A .10 Putt -slight B/C .32 Puyallup slight B .28 Pagnar- moderate -severe _- A _ .32 Renton slight B/C Salal_ ---- slight -- - B -- - ------- Sammamish none C Seattle none C - Shalcar slight C .24 Si slight------- B Snohomish slight D .17 Sultan -- sli ht slight C .37 Tukwila D Woodinville _ slight - - — _— C/D 45. 6,l (;R111.7R, Ijrc. 19707 - 441h AvAnue �J'ps1 • -,ifj Lynnwrod, Wa^h1nglo, s-2Z-79 �Y— P-27- �G6� STORM SYSTEM & DRAINAGE ANALYSIS FERNWOOD UNION AVE. S.E. & S.E. 2ND PLACE CITY OF RENTON, WASHINGTON May, 1979 79-8005 It C� �-w - ?, ` 7 4(y ' "'Itic; ENGINEF RING PLANNING %I 1 "Oe -7 OV 1Z x.,Ic z,4,e4!r ,pawozop- kf111-71 79- �1,�r i979 6 U,,:, 1-14t +,�-a / s yXp45 01'1 l &, -Ile J 1,76z y ,�tiz�� 0 0�31 18Z 0 r /JFi�Niio N � ,S,4&IV i 6L OOo/Ni�� lepy Dins/� _.- %i/ '"��' �:" •;?� � �.!� �'� � ��- �.,/�/,JM T�� v Al to -& - 9 4 _ _ D ZS o O, 4� .o 1S f 176 Z Y-i.11 _ ?BZO x T,o (Kai-vM f. r F -&J71011 i i A/W al X ':o �, 1,''f�y� � jam•• �^� �� ., � 'J '� ! : �7k. 5 ,v w z_ 7 16AWSS 79 lfs� .POD�,�,eAiivs ON ftXlor (SJPOdFf� INS TOSr�f a sksTL''ml 1 a,2yLVG!—L, A = JS OO/,A/N 7,5 Z ke4-, Inl APer� = / ZD c�.s _ D 11S 7-r I rJ I Las REMARKS INCREMENTAL RUNOFF TIME Of RAINFALL RUNOFF PIPE FLOW TIME U. w&CUTe LOCATION AREA COEF. AC I AC COMCE INTENSITY Q OIA SLOPE LENGTH PIPE CAPACITY INPIK STMFAEQ YR A C TC I (L AC- I) IPiPf tOEf. FROM TO ACRES MIN. IN C.F& IN % FT Q MIN 61? 2 S 4- 2� Q e4 11,5, /, 3O 0,3' 8 D-�' Z8 D yp 2 �¢ iJ, � � s.5fi,�c �� °° R,A g 4.7 �- 24 w / % J y �� 2 Q 9.S `j S9 r _ 4- 1716 6 S8x36 >°A �`� 2 27.Z7 70 �sz4o F D ,�o �B o� 3 /779 -7Z 3:&" GROUP FOUR; Inc. •Y �, sli�EL/< ?/✓ SKEET 10707 44th Avesae Wed �E�/J yf/p� ,, % / ao Ha 7�?- gam Lywxw ot, Waohixptos to M . 20 7754581 I ItiC"ENTAL RUNOFF LOCATION AREA COEF. AC I AC A C THAE CIF CDNa TC RAINFALL INTENSITY I RUNOFF Q (I AC - I) PIPE OIA SLOPE LENGTH PIPE CAPACITY FLOW TIME IN PIPt REMARKS LSM18.CNTle / gm FmQ !J YR. PIPE COIF. MIN t IN US. IN % FT Q V PAIN FROM TO ACRES �j _ �•- /) 2 G D 4 , ' p 4S - D,�� ZS-� p /Z ,73 674 n o 17ZZ /7 62: ,': 7 92 / 1 7 16 /b _" -. D ¢Z -�0 3 Z�j 3 so ,7 E J �" 8 / Q 1% �, _ 12 o �/ g3 1, V oy /S /3 / . ,/3/ �,O¢ /2, /Z 1,0 1106 90 .3,99 S/z z /z 9 v; , z ;• } RA 6, �/ �.�; .'.. �-�/; JO NCl 79 84� SHEET ? 2 at o GROUP FOMI)W. IRM s� A,s. Wed w"hbt0m WOO , sot 7754581 /✓l/✓!� 0 r i fWEMENTAL RUNOFF LOCATION AREA COEF. A C FROM TO ACRES i 1 GROUP FO+U lnI . 19707 44th Avemw West Lys+nbai, W"hinown "Gm , see r75- E AC THE OF CoHaNTMTKN TC RAINFALL INTENSITY I RUNOFF Q (L AC I) PIPE DIA SLOPE LEKGTH PIPt CAPACITY FLOWTINIE IN PIPE REMARK3 u.S.w&(MTIC /� STM FAQ YA P1Ptt COEf. D, ��� AC MIN. IN/HR. C.F.S. IN % FT Q `l MIN � _�'• ill J! )/)i'. T, =. _ .. 1l: �'' ��/C:7/i Jf� %�'�'F�Qh'✓ 12 o 4 v z/ v' Z ;�'/ ! Irr - SWEET DF o�E�P�✓WDOD iai>I �o rya