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03276 - Technical Information Report - Storm Drainage Calculations
. � 2�G STORM DRAINAGE CALCULATIONS FOR THE PETETT MEADOWS SHORT PLAT LOCATED AT THE 2015 UNION AVENUE N.E. IN RENTON, WASHINGTON DATE: JUNE 8, 2005 REVISED AUGUST 9, 2005 »r. ��r�rn � r ��� r �crr ? � �nnc 1'1�L' 1'r11tL' lJ 1S 1 : 1`11 1 :�1,-1:� l.l�lil.it.t'.l�i_\�, 15118 S.E. 43RD STREET BELLEVUE, WA. 98006 (425) 562-7226 �f„���_,:.;�;�► .,�•, r, ��� s . z�� � t,:L ��„�,�� �i�:i,. f ``.� � .� !� 'i V .i:� r `� 'd� IL� �'' h � , .Vr, 3 770 /(� 'O� C1�R��`'" � ` f�J` ,�J�iiTAL I�� (/ EXPIRES IO/1�/ � � � �� 32�� Nau�aTlvE: This project proposes to subdivide approximately 1.27 acres of land (55,245 square feet) into seven single-family parcels. The site is located on the south side of N.E. 21�` Street at house number 2015 Union Avenue N.E, in Renton, Washington. Furthermore, it is located in the southeast quarter of Section 4, Township 23 North, Range 5 East, W.M. (See attached vicinity map.) The site is relatively flat with a mild slope from east to west. (See attached USGS map.) The ground is comprised of overgrown grasses and a few trees at the western end of the site and the soils are Alderwood Gravelly Sandy Loam, which is considered to be a till type of soil (See attached soils map.) Stormwater will be conveyed to an above ground pond located at the west end of the site. The City of Renton requirements dictate that a Level 2 threshold for this pond. Since less than 5000 square feet of new impervious surface is proposed, water quality is not required. See Level 1 Drainage Analysis dated December 2, 2005 for information regarding the downstream analysis. I I � � �� ut� �� �� �� �� �� � � � � �� �1!l �,I � ��I� �� �E ���6 � �� ��{ �1�� ��I 6 � i � � J � .�� r ~:_� � �,— _ - , N � " �---,�-._� --.. _ __ - _ —� ((JP111(�1 20U0 �Flili�f[!�i[/.k'.�%/�liA'- I n ..:V__r ' =0� ._-.�. _'.��_ V .�.,..� �� A3l3.1 nE� i. ^� __I__� 1 Y� T'I .�� .-_�� .�.�_ t�i��t�c ��2 a�� � � .�, F ! BU,INC '� ---- __ �. .�. .� 'a - ----,. .----� .. i- , ti� _... .. 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I � S� 1�. ` L F�r_ ..f' � �, ` (�- ' ... . . � ,�1AlTlE �2� ....� �. .. � �� _� = 71 _ x _I' '�._-_- _—_ ..-�'`� '� ___ .`i�` � . .�t ,� � �,�,.��� ' �L .�� '� : +' i � ��� _ _ �` �� - .. �.. l�,-"•., �� I�.�'S` ii ,�i:' �',. c � ` �, �I,' �� " � " �1` . �� �,� �! ;InC?�- `.����� , - i - . - �` �1 �'�,. �� ' �Il y =�� ;f��� ��� � � — -_�;�; ' � i -,j' � r,� .�€� I� s ! ; ! .;1��wr• .� ,. �1 �,�gD � i' •t ,� ,� �L y. � �( :. ; � ;};-:::, : � � �. ,�,�—��`-i i T � —_� �� , . �� ` -� ° II =� �- _ ��:; ',;,�- �` �_ �:�:. !� � `�, .. ;, i a � �; � �� �. r. � , . �. �. ��.� ��� ��.I���� � :�; ;t ; �' � � _ _ .1 I � � s�;' t� � . \B �r\ i.a .- . ' � I'' , �`I�:. :�I � ) �•• s �—��� r ( t y , � I Arit G "'�� ?'� � . • '!�� II I M h j�� �� � ��IiP�rr ir.'I� � 4� � � �..,;,�`-, , - 7, i`- - 1�• ' :� ..r `_�_�L_-- ' � �' ��� � .�:� +i.a �•. z� • �.� - _ �. f� �� �, � ,� , g, ' . i i sM ��V '._ i <N ?� ,t ..��1 ' '� - i� ' �y;� j ". . � ,i, � �� 'i Ip-_. - ��� N� ? '� , �P� J` •:� � ' � '.Ji � ` k� /�r I,�"'� s . � '�� � �. �� t, ��� • . ���r+-a _� .I � i ._li ""_"."� ��' !I �` n:�, ' . :i , ,' `�3 � �'t 'y � �i �. h��i� . C '���{Li� �.��� �? R�r ' � �'_ _ _ /-`� - --�'-� -�� F�`l�r �.�r�o-�'_� .:�i �. �� �,�-':�_��_ IrL J `�-�I ; � .t'��"�. _ , > ; _ .;.- . � - - - � ...._ ,_ -• � ' - - . .. � _�-� , ,. - ` F _ r---. _ `-- � _ __ -�- CORE REQL11RE1�TE1�'TS ANAL1'SIS: 1. This project will discharge stormwater from the site at its natural location. A conveyance system will be constructed to direct the flow to this location approximately 300 feet to the west. 2. The Level 1 downstream analysis has been prepared and submitted as a part of the preliminary approval. No impacts to the downstream system are anticipated from this development. 3. Flow Control is dictated by a Level 2 Standard. A detention pond with a controlled outlet is proposed. 4. The conveyance system will be analyzed for the most stringent condition. 5. An Erosion and Sediment Control Plan is included as a part of this submittal. 6. An Operations and Maintenance Plan will be provided as necessary. 7. Financial Guarantees or Liability will be provided as necessary. 8. Water quality is not required since less than 5000 square feet of new impervious surface is proposed. SPECIAL REQUIREMENTS ANALYSIS: None are applicable to this project. i i � � ����� .��.�, a�, . . � �� � � ; �� � cx�o.57 �s �� `� � � � � � �s oQs � _ <� � �srz) t s ��►-r�� �a � , i �� ,S � 4, > > �s�,� ) 4- C�'� i � ; , -1���`�'�' �" `.��a v�9 v o �`1 I °d S�o.�ti w� c-�a� � � � �, � 1 � �� - � ; � 'o — c, 5�a.�► O��c-� ' ..�--���Cc.. _ � � Q . � _ S �.a � „ a, �-°�' y,�,�►� � � �.� �a � v+.a� i`.�'��-� �--�Q��,n-a� � � �' ` I � i l`7 ��'d � � � : � � � �-Z� � c� 5 � �..,, � ���2 �"�� #7�Q = �"�i�.i.�"�O` �`�� S c+O 1 1�J�� � � � ��.�-o = �s�.s� �-s�-��� � � �P , ,�.,-� ►�s L�; ; �� (f � , i !�`9G'� ' � NNii � S vo �, ��'m� �.-`�S ��C� :.r ��� , it N� O O tn � O4?O I=� � rx m m f� �m� I . `n'1��-�1- `�^�1 1 p"�^l�"J 11(� te tMn t`i!r r ' ' '�-�f �-,' � = Q O ��o�J = �5�.�� q+�l =-�-�.,.�J G'-��..^� •.��, ��,� : i�-tZ'1:� �,Z �SS - �� �+� -�ZI �.a�,' n � � � — �� "'`�.+ �"'�' --J-. ; � t�'1 =� �5�9-F� _ ���.-f�7 f,o 1 � ��-.'p".�r '1 'S a''�'�-�- ; � ; � ��.�� � a �� �+ �-�'� ; I ` , ._� ; � ����� ���d � � _ �}�d �� '� �sn� i - � _.`aa � �=�.�p c c�-�-r -� ��'�'� � . Y fi/ - - - --- � � � � _ - — _ ` . � 1 � GJ''�` /�'t.� � � 1 .� _�,�.....,.� �,_------�__ _ . �-_ _� _ �}J ��L ���1� �� �r}._� J —�_ �> _'_ -F-•`_'___"-_...���- _ ��N._ '' li �.<.._ _ � � � _ �� .. --� l II c�� J N� PIPE � � ' ��k'�6a. �� � 8 �OATf�f�� ',:. � i, � Q�0�60 3 1 ���t ��1,�I� � ?O i j Q YEIOGly„fPs �. �, i s�„ \k - i ( ' ,�� ` �.� �O � '� . � ,. _ _ ,� 'o �� s . � � 8 0 �= � �� .�- � �T�� z � �� � •,4 •, O Q - 'a �n e � "� � �.��vo, c,,°Oo °���� �;, � ( J I/�����i?"� �� 1 � II Q �ti,,: M P�� \ SGAtE.�„ �� r p ; •� �`� O`Q� ' � ; 4�'� a+ `, y� /G4,�.���.41� a+ � � �P�� . � . . e� ������,��0S���� � . O ��. I 'a9" "•'��N� _ ;� i�'O�.QsOv- �'� p y f E ''+'s t 5 12� A ��.�-• .. � . P . f :36"_ -�t �O 1 � 1.0 A. D i . 1 c?'~ .� ' z, B � 1 ��;_ . W .. O q 0 I ' 33" �� .. no .�, 1 �� -Q o � �, ��'� . `T 4;' o' � � ' .,��� .�.�, � � �o� � � � 9' �jr►'�'�:,a, '� '� °� Qe ' � ', . lb f q1"' � ` �.. 4Q� i ' �o s.�%Jy�� '� �'y i . " � � 1A /!`� � �p b �� r ' r� �P � � o O�' • �� 2 P I U ����F.,'1�~ � ��t .R B 0 D �S G� � `'� i s 4, ryo •06 ROUCi1'�N�S p�0 ,� � 'I , ; ,rj8 � � : �0 � SLOFE.-FFEt p�a i I f . �,, ` . � : '2 .3 .4 I ' ; Cs ,��a . =o � ; t1.5. GALLONS ���TFR � v N � , T____- � �`�� � t � � � '._ FEiLD'S Lf'IfDBAULI�S CA6CN6ATOR �•��� .' i ' � ;: FOR GRAYITY ' � . �LQW IN PIPES � , s�/.wn�r macm ` i..,c.vuu ��PY^9M 1950,lseA+l!W ts�t � � � ta-e»• BASED ON THE MANIVINCs EQRMUTA 3s14 ak�eenoo���wu* S AleaaadrfO.Kir - . ¢ • . � ... � . . �:� ,' + � � � i � � ; i � 1 � � � � a { ; _ l � ; � , ; ; ; �,v, � w'�'�''rl , J �'�� , , ; r2�' � � � ' Q — Z�► � i = � � ��� (�.�2�"� �Z �. �� ; , ; ��� > � �/ � � � _ NaNSN � ��lO _ � iaAA i ja N�+ 1 i N� � O O O : /��� '��� � 'I=S a ��// (( �, A1/R T 3 �QY� '� �� �..��� � � ' V � �v'u�� V1 tn V� t j � � � ± 5—,,--�t� -�, ,�,,, �yL�Q � C�Q1 � i — �� 3 , ( . . N��S ^''�) � �`�J���) i ; � i _.—, _ -�--��� sy��rc,�.� c��-'d I � � �}S S��vt� -���C S °� '�z -�'�''S�'�' : a� ��c.-t.t>>d r � � . s c�� � � - � �� ,�»� '� . 5 5: : 5 1 '� S 55 / i 55 1 5 5� � '. 55 . : . � 5 � • ;5 . COPI Ut6 Time Series � :.rs... �... ...� r„�„�,.� -� . � .._ . __ _ � . - -�� �'- �� �� � �� �°`��� "'� �� - � �� �.: s-'���� .�,_��: Flow Prequencg AnaZysis Time Series File:pettpre.tsf Project Location:Sea–Tac --Annual Peak Flow Rutes— Flov Frequency Analysis----- F1oW Rate Rank Tiwe of Peak – – Peaks – – Rank Return Prob CCFS> CCFS> Feriod 0.116 4 2/99/01 15:98 8.244 1 1�.88 0.998 0.�,7 7 1/05/02 16:80 8.132 2 25.00 0.968 0.132 2 2/27/03 7:88 �.128 3 10.88 6.908 0.942 8 8/26/04 2:89 9.116 4 5.08 0.880 0.�?0 6 1/05/05 8:88 0.112 S 3.08 0.66? 0.120 3 1/18/06 16:08 0.0'T� 6 2.69 0.580 8.112 5 11/24/�i 3:08 0.86? ? 1.38 0.231 8.244 1 1/89/� 6:88 0.@42 8 1.10 0.091 nputed Peaks 8.286 50.�0 0.988 . . � � � �� KCRTS `'r ��`� � � ���� }. � � . .. , .. , � � . .. � . .� � . .. � . .. � . � • . � � .. � - � � - Com ute Time Series � - # �r`�,Y ,,�_ `� ���- Flow Frequency Analysis Time Series File:pettdev.tsf � �� Project Location:Sea-Tac ---Annual Peak Floa Rates--- ---Plow Frequency Analysis - Flow Rate Rank iiwe of Peak - - Peaks - - Rank Return Prob CCFS> <CFS> Period 0.286 6 2/89/81 2:M A.570 1 1�.88 0.999 8.248 8 1/95/82 16:68 9.390 2 25.88 8.968 0.342 3 2/27/83 7:BB 9.342 3 18.88 8.988 8.268 7 8/26/94 2:99 8.321 4 5.N 8.898 8.321 4 10/28/94 16:09 8.304 5 3.98 9.667 6.394 S i/18/� 16:09 0.286 6 2.89 e.500 8.398 2 10/26/�, 8:� 0.268 7 1.39 �.231 9.570 1 1/09/08 6:� 8.240 8 1.18 0.091 omputed Peaks 6.510 50.08 0.980 . � t\ �S1e.,L�k� :��a����. �, �'�'' � � _.',�s ..,,as" .�., � - � ' � 1 J � �1 J J J � i i i ' � J J I 1 J J J I I J 1 J � J 1 J J I " 1 ' 1 1 Com ute Time Series � � �, .KCR7'�-:,; �'~ .��� �. # �a Flow Frequency Analysis Time S¢ries File:pettby.tsf �-----��-- ---�- Project Location:Sea-iac ---Annual Peak Flow Rates— —Flow Frequency Analysis - Flow Rate Rank ?iwe of Peak - - Pealcs - - Raink Retum Prob �C�� <C�> Period 0.060 4 2/89/81 2:90 A.130 1 109.88 0.998 0.839 6 1/85/02 16:88 8.8'T2 2 25.88 0.960 0.072 2 2/27/83 7:00 6.8(4 3 19.88 8.988 0.039 7 10/28/04 16:�9 e.868 5 3.88 8.66�7 0.064 3 1/18/06 16:80 A.839 6 2.e8 0.508 8.668 5 11/24/86 3:98 8.939 7 1.38 0.231 0.136 1 1/99/e8 6:88 8.838 8 1.18 8.891 o�nputed Peaks 8.111 50.08 0.988 - � , . . � / (! I � U s� r � p � �� L.t � _ � .� x �� . � � _ , � �� � ���t�.��:� _ o�X� Edit R/D Facility:POND Side 51ope CHorizontal Component> 3_000 Lenyth/Width Ratio 2.600 ! Effecti�e Storage Depth hefore Ovet�flot•� CFt> 4.BF�B � Elevation at 0 Stage CFt> 100.000 � Riser Head {Ft) 4.000 Riser Diameter <In) 12.000 Number of Orifices 2 Top of Riser Flat ' i - - [H] Edit Test�HYDROGRAPH Parameters [R] Define RISER Oz•ifices and Notch CI] Iterate then save to pttstr.rdf � � �� !�� 6 � �oi�+�i� �l I��G� , �� �.. �� � ' �`��' �.�--���,�� ����� � _ . �i �' � � '��.._���_ °.��� .,_.. � � Point of Compliance — Facility Inflow: pettde�.tsf Facility Outflow: t•dout Ht7/T4! file for Control Sti•ucture Outlet Pipe (File yenerated by HCBW Backwater Proyram� , Filename (s ecif ) P y - . i POC- Facility 4utf lotr If POC=DotanStream Outflo+a ==3 i�put applicable data heloor 111111111111111111111111111111111111111111111111111111111111 i Compliance: Discharye i Lag to POC: 0.000 � Tributar•y TSF: Cspecify) Reservoii• File: (specify> � Doainstream Outf lou1: dsout ! , I -��`-.:; C}�anges.Gcan��lete ,£or t}te D�e.�nStream i?nalysis I O�Dr11�7rIrIMNLA�r1 � . � � ��y► • ���! � � I �MrMINNli'i�"��iMT�� I .0 I I I I I 1 1 � I � V 7Q'NFf��ILff�O►IAN ro���m,,,�-�,�-�,�'-���,�-� ,. � m mmao�mmmmmm �;� � � 0 , � � �O�ON MO`Y7��DNOD � . . � ��C�r111fODNLP� , , . �. . � O Ny��rlrlrlNNNMl+7 �i+n m .� tA I X�mmmmmmmmmm a�� w •.� I a q d � � � T I V NrIrINNNMMC'!� A rt I I �mm�mmmmmm� • *� "� � � I �WWWWWf�WWWW- ,,,, �, H � �,^��, I � �a�r,o�mu� o�mv��o � µµ 61 �W .0 S mm \ - O I I .4�'frlNMritOl+7N�Orl ;`. �, � I � �mmmmmmmmmmfdt � . . . � � �o'�a++� a a c�'i�+�� ��+ e ���w -� �,�s exww y y �ww u�w•� �a�v � 0,--------�-------- � o �n+ ' ' ,�;��'. °"mmm c�i �mm a"A 6 i i �u�ma�mmmmmmm ��-' �". � . . . . 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