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Home My WebLink About03213 - Technical Information Report - Drainage' � � � � N m . : . � ��►�� ; .�, ;' �'+C3 R <: ::.;..:...... ,:> < ...;,> >.: .. , , < 5,�1:VT�'Si�f�1 S��€3R�'`:�''��` ' ' > r�� " ........ 13l t� 36 > �TR��`�'' ' :; <; ; > ; > ; ` �2�:i�'�`(3t�, �'4{r1��;��'U11E ;;: ;, ; DEVEl.OPME�IT P��r�ING FILE NO. 851-001-031 C1lY OF RENTON JUN 1 1 2004 �E�E��ED PREPARED BY TOUMA ENGINEERS 6632 SOUTH 191ST PLACE, SUITE E-102 KENT, WA 98032 (425) 251-0665 June 2, 2004 o��oRH. ""s� � � R� � ��, � °'' f �� t , �9470 � l.� � j01YAL � BXPIRE9 8/22/OS _ 1 �,2/3 TABLE OF CONTENTS 1. PROJECT OVERVIEW lL CONDITIONS & REQUIRMENT SUSMMARY [II. OFF-SITE ANALYSIS [V. FLOW CONTROL AND WATER QUALITY V. CONVEYANCE SYSTEM ANALYSIS VI. SPECIAL REPORT AND STUDIES Vll. BASIN AND OTHER COMMUNITY AREAS VIII. OTHER PERMITS IX. EROSION/SEDMINTATION CONTROL DESIGN X. 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AkF I AkF • _/ /� � AMF\ '_ .r�� `.-_ --:� . �I � I q� lvt� � �:��*' • _ = I ^• �'�I ;.�.�� , � Coleman Poin Q _'�''- . - _ �' -='-- , Py / �,':` i-;=— , _'�I,'},,1.. 1_ '� '•� �, AkF -- ( �p � � �'.. •:q • '\l' ' J�, -�------ -- t- -- 1 ' - / • � ��-`��- -�'--- HM�na�� 9�� r-�= --� ^ BMy 11 �t9 EvB ' B .:�/i'� D �- _'__� tl '�l � i i��--.nkl� ! ^ �e :I� HM� p� /' ��i �� --- i _ f� ` l � � � ., 0 J �Jn_' a.� • � "I'' � t�-�,:'�- i, v `" i ' • A�:i. !�• ' `.�I: '�I• �`-J= `�` '1� -��1! !:�� O , ;___, • : .. , ,�i"' �� . ��- �--�-- -�_---� �� 1� ' � ,F �� j ��ti Ryiin.. I.. • �� ;�� ; i �` I• i ' Aiu�' . '.ir�_ I II i I�`�,� �' ' I _ � 1�' _-- __� __ ` :I� � � �� _ - � - 4_ ,,,`.,��i� �w = _ ., I � .�� ,. i ''�,° . �� I� ,� ,�. \� r '� i 'i \, i�� tr�c_ !t,��Y, �;'� i , _ ° � ' �1��'�', � ' I Ae�` • • '�1 -�. -�y �,.;:; ,� k•�' i� � �, '�, � ; I • '' � % � I � A��.. [awr ,1 ��,� ( � � ' Y��, ;1�� : - '}'I - r �� AkF ;�I �� -+ �� • . - �- C . Ij,i • �i- 's . ; . _` ''� ' �_,..��_ . . �•� . .� ;ii,'v �'' . ;.• : .�; <<• �� :.,; _ ' � : �l�r � F - - -- __��I:�. .s -- � - : i •P R f � �"``: _,,�t , ,. . � �v' ` � , - �,, ��r ,� �;:; ", �► . �;'T �Fzr�i��U�1.,1`� , �� , �-� -- 1. PROJECT OVERVIEW This project involves a single parcel of approximately 0.72 acres. The project is situated in the north end of the City of Renton. It is located within northwest quarter of Section 32, Township 24 North, Range 5 East W. M. The proposal is to create 3 single-family lots, "Fil( in" subdivision. Access to the proposed project will be from existing street, N 36�' 5treet. The site is bounded on the east and north by single-family lots, and it is bounded on the south and west b_y N 36`h Street and Park Avenue N, respectively. The soils on the site are composed of Indianola (InC) gravelly and fine sand per the King County Soil Survey. The Indianola series is made up of somewhat excessive drained soils that formed under conifers in sandy, recessional and stratified glacial drift. This type of soil is designated by King County as Type A soil and is good for infiltration system. The site is hilly with maximum grades of 13 percent for majority of site. There is no indication of slope instability visible at the time of visiting the site. The surface water flow from the site is oriented from east to west and south toward North 36`�' Street. The flow is sheet flow across the property toward N 36`" Street, and thence north along Park Avenue N. The flow is directed �vest along N 40`h Street to Lake Washington Blvd, and eventually into Lake Washington, approximately a quarter of cnile downstream of the site. The proposed development of the property is considered as "infill" project and it is located in a Single Family (SF) zone. The City of Renton designates the site with the SF zoning. The SF zoning allows for a minimum lot size of 4500 square feet and a maximum density of 8 units per acre. The setbacks allowed in the SF zone are as follows: front yard setbacks, 20 feet; rear yard setbacks, 20 feet, and side yards setbacks, 5 feet on all interior lots, and l0 feet on corner lots. The City of Renton Comprehensive Plan designates the site as Single-Family Residence, which is consistent with present zoning. The density for the proposed three lots yield a density of 4.2 DU/ACRE which is less than the minimum of 5.0 required by Code. The owners consider a shadow plat of 5 lots in the future, which will yield a density of 6.9 dwelling unit per net developed acre. There will be no new streets private or public planned for this project. The access to the proposed lots will be from N 36`h Street. � Majority of trees wil) be retained except for few deciduous which fall within the building en��elope I!, of the proposed new lots. There will be no land to be dedicated to the City on this project. — 3 CORE REQUIREMENT #8 —WATER QUALITY The impervious surfaces subject to vehicular traf�ic within this proposed short plat is less than 5000 square feet, thus exempted from design and installation of water quality tank or pond or similar facilities. SPECIAL REQUIREMENTS: THOSE APPLICABLE TO PROJECT l. Critical Drainage Area-N/A 2. Compliance with existing Master Drainage Plan - N/A 3. Conditions Requiring Master Drainage Plan - N/A 4. Adopted Basin or Community Plans - N/A 5. Special Water Quality Controls—N/A 6. Coalescing Plate Oil/Water Separators—N/A 7. Closed Depressions - N/A ' 8. Use of Lakes, Wetlands, or Depressions for Detention - N/A I�, 9. Delineation of 100 Year Flood Plain - N/A 10. Flood Protection for Type 1 and 2 Streams - N/A I'�� 1 I. Geotechnical Analysis and Report -N/A 12. Soils Analysis and Report - N/A i - 5 IV. FLOW CONTROL AND WATER QUALITY The following calculations conclude that the 100-year peak flow dif�'erence between the pre-developed flow and post-developed flow is less than 0.5 cfs. In accordance with 1990 King Count Surface Water Drainage Manual detention is not required. The following calculations include: Basin areas Time of Concentration lsopulvial graphs for 2, 10 and 100 year storms Pre-developed and Post-developed hydrographs �.�.- - 6 II, , .. .. .' . ��VV Il�l,•�1L � N�IVV :J�l'�.VLJ `NO�XX�XX\. -- ;�R� ;i�R�NT ' � J^" UEil-100 UScD: FlELD �RAVERSE 'MTH AC'UAL o- UTILITY PC�E '� MON iN CASE/ FlELD MEASUREMENTS AND ANGLES ' E— GUv �nRE o Ex RE9AR / PiPE waC 332-�30-090 AS NOTED DATE OF SURvEY: JANUARY 2003 � L1GHT POI.E SET t/2" REBAR �c BASIS OF BEARING: N 38th STREET (588'a3'29"E) � GAS VALVE � CAP LS�9470 �. BENCHMARK: TOPTSTEEOPIN3NtCONCRETE IN CASE INTERSEC11pN OF N 3pth STREET dt PARK AVE N _ _ _ NAVD1989 �VAT10N = 201.26' (61.3a3m) I- �iNc - - '=` i REFERENCE SURVEYS: AF#960169002 & 8412129002 I '�� ` ��" � - _ _ 5 88_a3'29" E 66a_�S' _J LEGA� DESCRIPTION — — — — T}�E WEST HALf OF TRACT 93. HILLMAN'S LAKE WASHINGTON GARDEN OF 1 i AION IN CASE(1/04) EDEN aDDIT10N TO n-IE CITY OF SEAT'TLE. DIv1SI0N N0. 2. ACCOR�ING TO i THE PLAT THEREOF, RECORDED IN VOLUME 11 OF PLATS. PAGE 64, IN KING COUNTY, WASHINGTON, I I ►i0r+ iN CASE(t/0�) ITAX 1.0T 34270-0474 1.0T i � '^ iNV EL = i59.26'-12" I REN70N SP�y193-78 ' I ; i .J' � ,� AF�7811039013 � � � 11" , • n'� � !.i ri 'a cr, � n. I PARCEL A I ' � N , , / .�,' :` �1 8$�43�4�J� ��/V ��1Q.61• % ^ I RENTOAF�j9 61 016 900 2-SHP I ; � O i � �� 1 � I .� �.��_ � � � � � � � '- � ' g ?;I J ( �"FRUIT j I / t � , 50.00' 60.00' I � ,�;� '� '• a,PLE � ' ' � Q � �•' �I • ` � ' � `------- , � .. � I, Cb i I 27iO3' " / � _ i i, i I STUMP i �. 38.I4' N�: l ai ��.�� lrj,11'FRUfT� ;DE K-�� ' N a � I �� I, ; �l • i �,: ��`-�_ � � 3 � �Y�Z�.+ �,�a� �, "MAPLE ' I� -- . �� ! '1 1 'Q'- 1� �. �3� �,,I � I� � S MR 1 i I ! - ,.MAP,CE ti, r" ,�'`Q�tOp`y O ;W�W o� ' '�, L—', /g � •., r � I ; �__� X -%� �4W s MP �_ ` W o ��ya ;� � ,�,� �',::i �'� LOT 1 cor�c E — LOT 2� �LQT 3`_ --- - .� ��`�ti� � �w�Q� '��10 �'�� ' � ' �� _� HOUSE � � z � � �e? I �� i N � '�y I �o;wnlK �� ' t,359 sq.ft. Y o ', �� o 'o'Y� ' ,' / �� , �'� '�" I I . $ , � �S` I�' :Q i ;v��;� � �i� � ►ION IN CASE(t/04) �� ; �6'OA��PIE�� ' � " MAPLE ��—" �.�OC I ¢I � ' � •— oc ssu+ / ; "'++,.'3� �.�.� :oNca..-� ; , '� � v� ; a' r' f �u-a� 184.89' � � �•�d"�� ., �,NAIL � f'' \ • ; ; �N�a� ; � . � � � iNV EL � 163.10'-�2 -� ' 26.22' �R ,�� 1� � �� 18"'� � A ��--� � � MON IN r -1_- � . 2 MADRONA �'' Z � CASE(1/04) ' .; I1.� . i ::� � 2��.8�� `�. ---- t------� / � S .�� 6�.�� ,� :GZ I r ' �� s 4 �—�_.W � w • — � — i— L1' ' 330.81' � ; i , w-3 i 99 ' <+ p ' 0' - ; ; i i � i � _�. � ,� � � � - ; I , i , I ; � '. '�, �� `� N', 36 th 5 TR EE T �'� i �n 1 55 1 SS---�_I SS � 95 �� I �, � � 3 J .., n`J . ._ . : ; . Q __ `�.• �� :�� !� � � � IOC)/ � _ J'_�i r.i ` _ r _ __..--" _�_ I I�vv �q O � ; � I�a, STA 1+00.00 (PaRK)= \ � '` �.-'? Sra t+o0.00 (N 36th 5� , IX� � \� }�' �-�'�� O i�� a. ��24 ""� CITY�RENTON AION �R66 � �cn� CITY OF RENTON 40N pi886 ;i t/4 CORNER SEC 32-24-5 '� SW CORNER SEC 32-24-5 w�d' FWNO 1/8�COPPER PIN IN FOUNO NAI�IN CONCREIE IN CONCRElE IN CASE(I/04) 13 0.96'(C� 1 CASE(1/04) INTER JCHES�vE NE h NE 28th Si S 89'03'Sa' E 2633.67' (COR) 2633.96' (M) - ��^� STORM DRAINAGE REPORT FOR Sampason Short Plat TOTAL AREA .72 ACRES- ENTIRE PROPERTY BASIN AREA .72 ACRES- ON SITE AND OFF SITE SOIL TYPE Indianola (InC) Type "A" EXISTING CONDITIONS Residential Area - Landscaping .66 ACRES CN 86 I PERVIOUS AREA .66 CN 86 Existing House and Driveway . 6 CN 98 POST CONDITIONS I Residential- Landscaping .61 ACRES CN 86 � Existing House and 2 homes .11 ACRES CN 98 PERVIOUS AREA .61 ACRES CN 86 IMPERVIOUS .11 ACRES CN 98 TIME OF CONCENTRATION -PRE-DEVELOPMENT-FOR 2-YEAR, 24-HOUR STORM DESIGN SHEET FLOW- OFFSITE MANNING-n OVERLAND-L PRECIPITATION-P .15 SLOPE- S 3 FEET 2 INCH T1 = .113 FT/FT CONCENTRATED FLOW- OFFSITE 14.93 MINUTES MANNING-n OVERLAND-L PRECIPITATION-P .15 SLOPE- S 18 FEET 2 INCH T1 = .113 FT/FT 1.57 MINUTES TOTAL TIME -PRE DEVELOPED 16.50 MINUTES � -�� TOTAL TIME -POST DEVELOPMENT SINCE HERE IS NO CONVEYANCE SYSTEM, WE RECOMMEND USE THE MINIMUM TIME . TOTAL 6.3 MINUTES � • �- 2 SBUH/SCS METHOD FOR COMPUTING RUNOFF HYDROGRAPH STORM OPTIONS : 1 - S . C . S . TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S .C.S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP(INCHES) 100, 24, 3 . 9 ---------------------------------------------------------------------- ******************** S .C.S . TYPE-lA DISTRIBUTION ******************** ********* 100-YEAR 24-HOUR STORM **** 3 .90" TOTAL PRECIP. ********* ------------ - --------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 0 . 66, 86, 0 . 06 , 98, 16 . 5 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES) A CN A CN � . 7 . 7 86 . 0 . 1 98 . 0 16 .5 PEAK-Q (CFS) T-PEAK(HRS) VOL(CU-FT) . 41 7 . 83 6664 ENTER [d: ) [path] filename [ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: A: IQOYREX SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP C --- --- ------ - - -------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 2 0 . 61 , 86, 0 . 11, 98 , 6 . 3 DATA PRINT-OUT: II AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) II A CN A CN �'i .7 . 6 86 . 0 . 1 98 . 0 6 . 3 ' PEAK-Q(CFS) T-PEAK (HRS) VOL(CU-FT) , . 50 7 . 83 6901 I ENTER [d: ] [path] filename [ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: I A: l00YRD ' SPECIFY : C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP ,, �� , . ` V. CONVEYANCE SYSTEM ANALYSIS No conveyance system is proposed for this site. .�.! '� — 7 . , IX EROSION & SEDIMENTATION CONTROL '1'he contractor shall install silt fences along the perimeter of the site (if required) when the houses are built. _ g