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Home My WebLink About03393 - Technical Information Report - Drainage . - 1945 S.375th Sueet Federal Way,WA 98003 � schweikl & f�ssociates,pllc Phone:(253)815-1700 C'ivil Engineering, Project :�lanagement and Consulting Fax (Z52)s�5-i�o i November l6, 2006 ,ITYUFRENTU�v `� ��EIVEL� Drainage Report ��N � � � Project: SK - Preliminary Short Plat �JI�C�f�J�UI��l51�,�i`! Overview The following drainage report is provided to the City of Renton as part of the short plat submittal process for the proposed SK Short Plat. The project lies in the East Lake Washington-Renton drainage basin, which is part of the Cedar River/Lake Washington watershed. The proposed project consists of three existing parcels, Lot 5 (Parcel No. 9526400050) of the Woodland Tenace Plat and two unplatted parcels (numbers ! 3343900985 and 3343900981) of the original C. D. Hillman's Lake Washington Gazden of Eden Division No. 4. Lot 5 fronts Camas Avenue N.E. at the southeast portion of a cul-de-sac directly south of the N.E. 20`� Street intersection. The other two parcels do not front Camas Avenue or any other existing road, but are adjacent to Lot 5 immediately to the south and southwest. Total area of the three parcels is 27,424 sf(.63 acres). The current City of Renton zoning classification is R-8 Single-Family Residential. At present all three parcels are owned by Larry and Sharon Samples, who reside in the existing house on pazcel 9526400050 (Lot 5). The other two parcels aze landscaped and well maintained by the Samples as part of their backyard. The surrounding land uses aze all established single-family residential plats, including Eden's Garden to the east, Powell's 1 S` Addition to the south and the remainder of Woodland Terrace to the north and west. All utilities exist in the Camas Avenue ROW. An eight inch sanitary sewer stub extends to the site and is currently capped. The Samples existing house has an onsite system (septic tank and drain field). There also exists a ten foot utilities easement from the Camas Avenue ROW, southward to the southern property boundary of the project. This was originally intended to provide utility access to the two parcels that do not have frontage on Camas Avenue. The project proposes to short plat the three existing parcels into four single-family lots in the R-8 Residential zone and a 26 foot wide tract. The Samples existing house will remain on what is to become the new Lot 1. Lots 2, 3 and 4 will be south of Lot 1 and access Camas Avenue via a 20 foot wide private access drive across the tract. All four lots will receive their utility services from Camas Avenue. Because concrete curbs, gutters and sidewalks already exist along this section of Camas Avenue, no street improvements are required by the City of Renton for this project. The 2005 King County Surface Water Design Manual (KCSWDM) is the storm drainage regulatory manual adopted by the City of Renton. In accordance with the 2005 KCSWDM, this project is subject to a small project drainage review. The Best 3 3 93 R \ Management Practice (BMP) for controlling runoff from the impervious azeas of the project and the preferred method of the City of Renton is infiltration. This is providing the onsite soils w711 permit it. A soils report was required by the City of Renton and was performed by Goetech Consultants, Inc. This report confirms that the soils do support infiltration and in fact have a calculated infiltration rate of 11 inches per hour. i The King County Soils Survey Maps provided by the United States Department of Agriculture Soil Conservation Service were reviewed to determine the soil characteristics within the projects drainage basin. The survey maps indicate the soils of the basin belong to the Indianola Series soils classification. More specifically, they call it Indianola loamy fine sand. Indianola soils are excessively drained soils that were formed under ancient conifer forests in sandy, recessional, stratified glacial drift. The Indianola type soils in the projects basin are characteristically very dark brown at the surface, dazk grayish brown to brown just under the surface, turning to dark yellowish brown around fifteen inches below the surface, and finally ranging from light olive-brown at thirty inches to pale olive at depths of sixty or more inches. The soil near the surface is loamy fine sand and becomes just sand as depth increases. Common traits include dry, nonsticky, nonplastic and slightly acid soil. Soil permeability is rapid, and available water capacity " is moderate. Runoff is slow to medium, and the erosion hazard is slight to moderate Resource Review The available resources were reviewed and a summary of the resultant research follows: The project does not lie in either a FEMA flood plain, a Critical Drainage Area or an adopted Basin Plan. `The King County Sensitive Areas portfolio was reviewed with the use of the iMap website and there are no sensitive areas located onsite. There aze no mapped sensitive areas in the surrounding vicinity within a half mile radius. The closest being a sensitive landslide area approximately one half mile to the northeast that parallels Honey Creek. Two recorded Department of Natural Resources and Parks (DNRP) Drainage Complaints, both to the southwest about one half mile from the project, were identified but have no relevance to the project. There are no reports of the existence of any wetlands on or in the project area. Design Plan The conceptual storm drainage plan will be to use onsite infiltration. The existing residence on Lot 1 will continue with its present method. New residences on Lots 2, 3 and 4 will have their individual roof drains collected and conveyed through a storm drainage structure with a sump, to infiltration drywells. Sizing the drywells per section C.2.2.4 of the KCSWDM-Appendix C, requires 90cf of volume for every 1000sf of roof area, given the onsite medium sand soils. Designing for the house with the greatest roof area, that being 1809sf on Lot 4, and assuming two drywells per house, leads to each drywell servicing 905sf of roof area and needing a volume of at least 81.Sc£ Using five . foot diameter drywells would then require a four foot two inch minimum depth of gravel in each drywell. Runoff from the new residences driveways and the proposed 20 foot wide access drive will be conveyed by design as surface flow to a Type 1 Catch Basin and distributed to an infiltration trench located under a portion of the access drive. Sizing of the trench w�as done using the King County Runoff Time Series (KCRTS) Hydrologic Simulation Model. For the projects proposed 5,406sf of impervious driveway area, the model calculated that a trench 48'L x 3'W x 2.5'D, would be needed to infiltrate the predicted stormwater without causing flooding. Summarv In summary, the project proposes to install six infiltration dryw�ells and one infiltration trench to address the drainage requirements associated with the development of this site. All design work was prepazed in accordance with the 2005 KCSWDM, the accepted City of Renton drainage design manual. If you should have any questions or require additional information please do not hesitate to contact me, Brant A. Schweikl, at (253) 815-1700, and I will do my best to assist you in any way possible. � �� -. - � ��- _.� _A� �{. i7,og � p - 1945 S.375th Street �'� .Scliweikl & Associates llc �eral Way,WA 98003 � p Phone:(253)815-1700 Civrl Erigirieering, Project Managemeitt a�rd Consulting �: (25z)s�5-i�o� SK SHORT PLAT-06078 INFILTRATION TRffid(� D$SIGN DATA Retention/Detention Facility Type of Facility: Gravel Infiltration Trench Facility Length: 48 .00 ft Facility Width: 3 .00 ft FaCility Area: 144. sq. ft Effective Storage Depth: 2.5� ft Stage 0 Elevation: 100.00 ft � Storage Volume: 108. cu. ft Vertical Permeability: 5_40 min/in Permeable Surfaces: Bottom Riser Head: 2.50 ft Riser Diameter: 4.00 inches Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation (ft) {ft) (cu. ft) (ac-ft) (cfs) (cfs) 0.00 100.00 0. 0 .000 0.000 0.04 0.10 100.10 4. 0 .000 0.000 0 .04 0.20 100.20 9. 0 .000 0.000 0.04 0.30 100.30 13. 0.000 0.000 0 .04 , 0.40 100_40 17_ 0.000 0.000 0 .04 0.50 100.50 22. 0.000 0.000 0.04 0.60 100.60 26. 0.001 0.000 0.04 0.70 100.70 30. 0.001 0.000 0_04 I 0.80 100.80 35. 0.001 0.000 0.04 I 0.90 100.90 39. 0 .001 0�000 0. 04 �I 1.00 101_00 43. 0 .001 0.000 0_04 ', 1. 10 101. 10 48. 0 .001 0_000 0.04 1.20 101.20 52_ 0 .001 0.000 0.04 1.30 101.30 56. 0 .001 0.000 0.04 1.40 101.40 61. 0.001 0.0�0 0.04 1.50 101.50 65. 0_001 0.000 0.04 1.60 101.60 69. 0.002 0.000 0.04 1.70 101.70 73. 0.002 0.000 0_04 1.80 101.80 78 . 0.002 0.000 0.04 1.90 101.90 82 . 0.002 0.000 0.04 2 .00 102 .00 86. 0.002 0.000 0.04 2 .10 102.10 91. 0.002 0.000 0.04 2 .20 102.20 95. 0.002 0.000 0.04 2.30 102 .30 99. 0.002 0. 000 0.04 2.40 102.40 104. 0.002 0. 000 0.04 2.50 102 .50 108. 0.002 0. 000 0.04 2.60 102 .60 108. 0.002 0. 103 0.04 I 2.70 102 .70 108. 0.002 0. 188 0.04 II 2.80 102.80 108. 0.002 0.230 0.04 ' 2.90 102 .90 108. 0.002 0.266 0.04 � 3.00 103 .00 108. 0.002 0.297 0.04 I 3.10 103 . 10 108. 0.002 0.326 0.04 I 3 .20 103 .20 108. 0.002 0.352 0.04 II 3.30 103 .30 108. 0.002 0.376 0.04 i 3.40 103 .40 108. 0.002 0.399 0.04 'i 3.50 103 .50 108. 0.002 0.420 0.04 3.60 103.60 108. 0.002 0.441 0.04 3 .70 103.70 108. 0.002 0.460 0.04 3.80 103 .80 108. 0.002 0.479 0.04 3.90 103.90 108. 0.002 0.497 0.04 4.00 104.00 108. 0.002 0.515 0.04 4.10 104 .10 108. 0.002 0_532 0.04 4 .20 104 .20 108. 0.002 0 .548 0.04 4.30 104 .30 108. 0.002 0.564 0.04 4.40 104 .40 108. 0.002 0.579 0.04 4 .50 104 .50 108. 0.002 0.594 0.04 Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (C�-Ft) (Ac-Ft) '� 1 0.05 0 .06 0.00 1.16 101.16 50. 0.001 2 0.05 ******* 0.00 2.32 102.32 100. 0.002 3 0.05 ******* 0.00 0.68 100 .68 29. 0.001 4 0.05 ******* 0.00 0.55 100.55 24. 0.001 I 5 0.04 ******* 0.00 0.21 100.21 � 9. 0.000 I 6 0.04 ******* 0.00 0.04 100.04 2. 0.000 7 0 .03 ******* 0.00 0_00 100_00 0. 0.000 8 0.03 ******* 0.00 0_00 100.00 0. 0.000 Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File_rdout.tsf Inflow/Outflow Analysis Peak Inflow Discharge: 0.050 CFS at 0:00 on Oct 6 in 1981 Peak Outflow Discharge: 0.000 CFS at 16:00 on Oct 6 in 1981 Peak Reservoir Stage: 2 .32 Ft Peak Reservoir Elev: 102 .32 Ft Peak Reservoir Storage: 100. Cu-Ft . 0.002 Ac-Ft Flow Frequency Analysis Time Series File:rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) (ft) Period 0.000 2 10/O1/48 0:00 0.000 0.53 1 89.50 0.989 - 1945 S.375th Street � .Schweikl & f�ssociates Ilc �e��Way,WA 98003 � p Phone:(253)815-1700 Civ1I EfIgIIlB�I"IIIg', Project Management and Consulting r�: (252)8�5-�70� SK SHORT PLAT-06078 I INFILTRATION TRSfiCH INPUT DATA Discharge (CFS) �, 0 0 5 ' ., � �, n � 1 rn � ��, a � N 1 J � Y� i f� t �:D 1<�, � I� , --1 I � � C7 O 1Q I ti T i '�`�� i O �;; G W �� O °:?� � C � >� � � 1 C _1 � N N O i�� '� � � r'�\ Q �S `C 1! �� O >�� 7 .> m � � � � � � I o `�' �r � I �`; Q II � -, � � cD \ • o o • i �t � � cD o � 'f . I ` 5` �n � � � � ] 1`, . (fl �� Q � 0 - 1945 5.375th Street Federal Way,WA 98003 � .�chweikl & f�ssociates, pllc Phone:(253)815-1700 Civi!Engineering, Projeet Mar�agement and Consr�lting Fax: (252)815-1701 SK SHORT PLAT-06078 INFILTRATION TR$NCH INPUT DATA � � � � . � . � Bottom Length[Ftj 48.000 7 Bottom VUidth (FiJ 3.000 Bottom Area [Sq Flj� Efhdive Storage Depth hefore Overflow[Fl] 2.500 Elevation at 0 Stage [Ft] 100.0U0 Yertieal Permeability�Miryln) 5.�Q0 Riser Head [Ftj 2.500 Riser Diameter(ln) 4.OU0 Number of Orifices� �Top of Riser --- ----- ---- -------- �r' Notched r Flat POINT of Compliance Setup � Edit Test tiYDROGRAPH Parameters � Define R1SER Orifices and Notch � SAVE tu TRENCH DW.rdf � ; ---- ---- - - -------- - . __ _ . -- - - ------ � Define how the Point of Compliance is Reached I Flow Frequency Analysis LogPearson III Coefficients Time Series File=dev.tsf Mean= -1.505 StdDev- 0.095 Project Location:Sea-Tac Skew= 0.553 ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0_031 21 2/16/49 21:00 0_050 1 89.50 0.989 0_045 6 3/03/50 16:00 0_050 2 32. 13 0.969 0.030 25 2/09/51 2:00 0.047 3 19.58 0.949 0.027 35 10/15/51 13:00 0_047 4 14 .08 0.929 0.025 43 3/24/53 15:00 0.045 5 10.99 0.909 0.029 28 12/19/53 19:00 0.045 6 9.01 0_889 0.031 22 11/25/54 2:00 0.043 7 7 .64 0.869 0.031 23 11/18/55 15:00 0.041 8 6 .63 0.849 0.034 15 12/09/56 14:00 0.038 9 5 .86 0.829 0.032 20 12/25/57 16:00 0.038 10 5 .24 0.809 0.024 47 11/03/58 17:00 0.037 11 4.75 �.789 0.030 27 11/20/59 5:00 0.037 12 4.34 0.769 0. 027 39 2/14/61 21:00 0.036 13 3.99 0.749 0.027 36 11/22/61 2:00 0.036 14 3.70 0.729 0.026 42 12/15/62 2:00 0.034 15 3 .44 0.709 0.030 26 12/31/63 23:00 0.034 16 3 .22 0.690 0.028 34 12/21/64 4:00 0.033 17 3.03 0.670 0.027 37 1/05/66 16:00 0.032 18 2.85 0.650 0.041 8 11/13/66 19:00 0.032 19 2.70 0.630 0.045 5 8/24/68 16:00 0.032 20 2 .56 0.610 0.025 44 12/03/68 16:00 0.031 21 2 _44 0_590 0_027 38 1/13/70 22:00 0.031 22 2.32 0.570 0.027 40 12/05/70 9:00 0.031 23 2.22 0.550 0.037 11 12/08/71 18:00 0.031 24 2 .13 0.530 0.024 46 1/13/73 2:00 0.030 25 2.04 0.510 0.028 32 11/28/73 9:00 0.030 26 1.96 0.490 0.036 14 12/26/74 23:00 0.030 27 1.89 0.470 0.025 45 11/13/75 19_00 0.029 28 1.82 0.450 0.031 24 8/26/77 2:00 0.029 29 1.75 0.430 0.043 7 9/17/78 2:00 0.029 30 1.70 0.410 0.038 9 9/08/79 15:00 0.028 31 1.64 0.390 0.034 16 12/14/79 21:00 0.028 32 1.59 0.370 0.037 12 11/21/80 11:00 Q.028 33 1.54 0.350 0.050 1 10/06/81 0:00 0.028 34 1.49 0.330 0.038 10 10/28/82 16:00 0.027 35 1.45 0.310 0.028 31 1/03/84 1:00 0.027 36 1.41 0.291 0_027 41 6/06/85 22:00 0.027 37 1.37 0.271 0.032 18 1/18/86 16:00 0.027 38 1.33 0_251 0 .047 3 10/26/86 0:00 0.027 39 1.30 0.231 0.023 49 11/11/87 0:00 0.027 40 1.27 0.211 0.029 29 8/21/89 17:00 0.027 41 1.24 0.191 0 .050 2 1/09/90 6:00 0.026 42 1.21 0.171 0.047 4 11/24/90 8:00 0.025 43 1.18 0_151 0.028 33 1/27/92 15:00 0.025 44 1.15 0.131 0.020 50 11/O1/92 16:00 0.025 45 1.12 0.111 0.023 48 11/30/93 22:00 0.024 46 1.10 0.091 0.029 30 11/30/94 4:00 0 .a24 47 1.08 0.071 0.033 17 2/08/96 10:00 0.023 48 1.05 0.051 0.032 19 1/02/97 6:00 0.023 49 1.03 0.031 0.036 13 10/04/97 15:00 0.020 50 1.01 0.011 Co�puted Peaks 0.057 100.00 0. 990 Co�r�puted Peaks 0.052 50.00 0.980 Computed Peaks 0 .048 25.00 0.960 Computed Peaks 0.042 10.00 0_900 Computed Peaks 0.041 8 .00 0.875 Co�puted Peaks 0.037 5 .00 0.800 Computed Peaks 0.031 2 .00 0 .500 Computed Peaks 0.026 1.30 0.231 . - 1945 S.375th Street Federal Way,WA 98003 � ,S`chweikl & f�ssociates,pllc Phone:(253)815-1700 Civil L;�rgiireering, Project Mcrrragement and Consulting �: (25Z)8 t 5-��o� SK SHORT PLAT-06078 DEVSLOPSD BASZN INPUT DATA � Land Use Type - ? Area (acres] Till Forest 0.000 Till Pastu�e D.000 TIII Grass 0_000 � Outwash Forest 0_D00 Outwash Pasiure D.000 � Outwash Grass 0.000 W�tland 0.000 Impervious .122 Scale Factor 1.000 -Time Ste - p --- ------------ --__----------- �` Hourly �` 15�ninute '-- ------- Data Type - - -- - -- - -- - -_ 't" Fteduced �% �Historiu — _-- -- - ---_ _ __ _ _ _ Compute Total Area � ---- — --- -- ---- Reduced is 8 years simulating Historic rccord 7 � Area-------, ? ; Till Foresti p.00 acresl i Till Pasture� 0.00 acres! Till Grass� 0.00 acresj Outwash Forest{ 0.00 acres% � Outwash Pasturel O.DO acres i � Outwash Grass! 0.00 acres! Wetlandi 0.00 acresi Imperviousj 0.12 acres. Total 0.12 acres� Scale Factor' 1.OD Houl . rly Historic Time Serfes: DEV >3 Compute Time Series � Modify User Input , -- _ _ i File for computed lime Series [.TSFJ . 1 FROf'1 ;Schweikl �; Associates FAY, N0. :253 272-4495 Jun. 12 2007 �4:�1PM P1 . DEVELOF'MENT SERIJICES CITY OF RENTON JUN 1 � 'r��ii� ,C��IWEIK.1. AND ASSOCIATES,PT.Lc �E��VEQ (:ivil En�Cineering,Prc!ject�lanagerr�cnt cu�d Consul�in� 7U5 S. 9��Stre�t, Suite 303 T&��n�a, WA 98405 Ph (253)272-44�1 � Fax(253) 272�4495 Tot3.1 pages, including cover: J ._ Send to: From: ,Tan Illi�n Rrant A. Schweikl, i'.E. C'�mpany: Cil.y of Renton D�te: 06/12/U7 Uffice Location: Rentnn City Hel!—6 'Ploor Project: SK Short Plat— �A Proj#0607R ' lOSS South Grady Way Renton, W�sshitl ton 98055 Fax Number: (425)430-7300 Phone Numb�r: (253) 272-4451 CI Urgettt C) Rcp1y ASAP sl�}�Pleasc c�mmenY �1c:�.�c review For��c�ur inform��linn Commcnts: Jan. Hcrc are the pz-zntouts of the S�c�rmSlted Sii�,'H calcul�tions. T}tie difference in the peak flows f�r thc I 00 year evcnt.heing bel�w thc .5 cfs threshold, Also included are sketches of the developed ailtl cxi4ting bfisis sho�ving the'T'C lincs. And I��stly, a quick cnlculation �f PGIS's sllorvin�that the nel�:�in is less th�n the S000 sf thresholri requireci for water quulity. Lo��king forwa.rcl to y��ur comments Respcct.ivelS� . T3rant A. Schweikl, P.�, ��fanaging Me?nhcr F5� Rentun U70G12.dor FROM :Schweikl & Associates FAX N0. :253 272-4495 Jun. 12 2�07 04:01PM P2 Appendcd on: 15:49:36 Tucvd�►v,June 12, 2007 EXBASIN Fvent Summ�r�� I ( EvCnt �Peak Q (cfs) �Peak T (hrs) H��d � ol (ncft) ;Arca (uc) ,�leth�d :Raint��pe I _ ......._.. , _____ .._.. ..: .----- -.._.. . .--- -- .._---_ _._.___-_.___. ___ _. � _...__ ..-�_ ;... j 2year j 0.0821 ; 8.00 ; �.0374 ; 0.630U ; S13UII jTYPFIn ' .............ww.,.. _.......r_,.._---------------- ___.._...... _,�.r---------�__;__......__._._, .___---__,..-- � l.0 year �.^---0.1905 ; 8.00 �.�....M.O.U730-.----�-•0•6300 ; SBUII iTYI'ElA I' --___ . ..Y..__�.,_., �.._._------------- . , � , , �25 year �� --0.2644 � ----8_.00��YM � 0.0968--- _.�, 0^6300 , SRtTHry.. TY1'�,lA 'i j1U0 year;--_0.3277 __ � $.00 i.��_U.I 171 1 0.63Q0 f �BL1II �TYT'E1 A Recorcl Id: EXBASIN - -- _ .. _ _. ....._-- - - --- _ �. . ,_._...._.. _.-- ---._._____�.__ _._ _ --_ _. ;Design Method SBUH �ltainfall type � � TYPLIA �; --------_ _ _ _ � -------- --- _-__ ... , ' _- -------- _ _--------_._...; �H��d Intv ; 10.00 mi�� 'P�aking Factor I �84.00 ' __.. __--_ ._ ____ . .. .. _ i._.----.__ __..__ _ ;. _ _ --- _ .._._.. .�.._._. _ . ... ._ . .----- -----_... ._._ _.. ! j�bstraction Coeff � 0.20 � , __ . _-__ ----_ _ .__ --- ...-- ---- - --- ;1'crvi��u� Ar�ea � 0.63 ac: �DC'iA � 0.00 ac. . _ .------ _ - -- ---------------- .__- ----- ;- --- ---- -�_ _ _ ;Pervious CN � 83.37 �DC CN 0.00 � I ._. . ..................._...-------.___._......_...�..�._...._.______------.._ ; . _ _.............._....------__---. .�......_� ... ___...- ---------... �Pervious TC . 6.70 min ;llC TC U.UO min _..........._._._ --__ . _..�. __.._ _ _ ..�_.__ - _.... . -- .--- -. _ _ ___-- __- ._ _ _ --- _ ___..... . ............. ...... ..- __ .. €� Pci-vious CN Calc � �f-•--- ---_ . . _ _._ , ._. _._ _. #� Descriphon SubArea � Suh cn ; � _ _ __. _.....�.. . __ __ _... _ ...__�-.__---- --------. __...._..._.------�-�-- -_ _��.__� ._..._-------- ____ � -- � . � '� Intpervious surl'aces (pavcments, rc�c�f's,etc) ��;�M1 0.19 ac � 98.00 i I � _ __.__.._.�......_._�_�------ ' ----------- � ' r�� > °o �ss � 0.44ac 68.00� li ; U pen s r�ces, lawns,pArks ( 75/ gr� � ) -------- -_..,,_..._._....------------- ------------ . _._ ------- --._._ _ ..�..........,...,- ---- ._____._ ____.__ . � P c r v i o u s C o m p�s�ted C'N (A l��C 2) ; 7 7.Q5 �� ` � ,. _ _ . ,_ _..... _ __ -:--: _ ... _.---._.. __:.__---. . . .. __ ,.._ _. .. . -----._ _............... __ -- --- .._ _ , ........ ._�.. . _ _ . , -;� i-�--- Pervious TC Cstic , �___. . ...._.__....._.__._ ___ -- ._........ . . _.._._-- �---�__ -- _,.-----. - - ---__ __...� _ _---- -- iType i Description ; Length ; Slope ;Coef� I Miqc I TT ;; , _ , . ._ ...---__- -- --___... . .. ._..-- ---- --- _..... --- --... . _ _-----_ _ __.-- ._.�.._ . _. . _ ...__, ;�Sheet �CJravel ;4�.00 ft t1.10°/a �0.0200 �2.5� in 1.48 min � ;;._ . _._. _.______._._...,...,...., . .__-----_ .__. ,... ...... ___..____� _... �_.__. ......,, ;;Shcct Smooth. Surfaces.: 0.011 j 1 S.UU ft �,�.OQ% €0.0110 �2.50 in j0,30 min 1 , _.__. ._ _ __ __.__ . -------------_ _ _ ------------- __ _._-- --... .. , , _ � . _ ;;Sheet ,Short pr�irie �t'�tss and lawns.: 0.15 �l 0U.00 ft �15.30% :0.1500 I2.50 in ,'4.91 min , �r' _----- --Pervious TC,------------ _ _. _. ----___ _.------ -�6.,. . _._.__ . � ..-------.-------_ , ! � ,� ,---_-- ------_.. ------------ ..__ _ _- ---------_. ._......___---- -- ____. ...._--------- -------____.._..._.._..__------------....:..: _ _ . --.__ _..._.__......,..-•---------------__............__...------- _-...__ . _ . ; µ~T'M��.mm^T,^m".^~_ Lieensed lo: Schweikl & Assc�c PLLC FR0��1 :�Sch��eil:l �k Associates FAX N0. :253 272-4495 Jun. 12 2��7 04:�2PP1 P3 Appended on: 15:59:23 Tuesd:►y, .Tunc 12, 2007 D�VBASiN Evenf Summary � Event !Pexk Q (cfs) �Pealc T (hrs) �Hyd Vol ($cft) (Area (ac) iMethod�Raintypc! .._..---- ---------_._F._.... ,,.,..._.. ...:_.,...._ __..--- ------- _....._. . __...V.._.�,.��,...vw,._._ _...._. -----....; j_ 2 year j 0.1732 � 8.00 ; 0.0635 � 0.6300 ; SBLTH �TYPLIA � _____ ----________.__. . --- - -------_ _...._.__._�.._ .� ------ i 10 year � U.3U34 � S.OQ � 0.1068 I 0.6300 rSBiJH �TYPf-:1 A. . . _............... -----_�__.__._......_.m�.�._..._�.....,..._.._...------ ...____�_.._....----....._.._--- - i___----------- j 25 yei�r � 0,384'1 8.00 i �.1341 ; 0.6300 � SBi.1H TYP�lA , ' ---- ____ ___.-------_.,_. _.__..._�__--- t ��0.1567 , 0.630U SBiJH TYPEIA { 0� year�--�..0.4514 ; S.UU , � -�--- Record Id: bCVBA,STN _ ._.__---. _ __._ ___. :. --- --------- - ----- -----------�..v.__ �_._._..__ ------,--�---_..._�_ww_._.__._._ _..� Design Method Si�U�I :Rainfall type j TYPFIA � _ _ _ .;.. ....... .. ---- -- ......_ _ . _.__ ._..__ . ...___ . ;. .......,_ ,..__..------ -- i _ __......_ __._-- -_ _- - 'Hyd intv 10.00 min Pe9king ractor i a84.00 � - _-- -- ..._...._ - --... ----- ,. ._..,.,._... ..._ ,_. ..._ _ . ....__.. ..---.. _ .------- � - . _.. : �Ahstraction Coeff E 0.20 _ . ._ _ __ _ _....__ _.._.._,__ ..__ _ .. ------- ----------. .. ... ._ __._.. ----_____ . _ ..i--_.- ---_ _ 'Perv,nuv Area I 0.63 ac ;DCIA � 0.(1Q ac , ____, ---- ----- _ ........ ....,_. ___------ -----__. j. .. � _. _.....---------_- ----_.__... . .._.__---- -__ ------- jYerviotis CN � 91.64 ;DC C_Y � 0.00 , ----------__-_ ,_--- _.....__.... ..._,..___._..___._- --------,___.. . _.. ........ ..... , .___._._....�..,..,.., �_.�_._..... .. ____ . , !Perv�ous 1C i 9.45 n�an �,DC TC 0.00 min ........._._ _..,._ ..__. ; _: � --" .. . .. ____ .. . .. ` Perv�auy C'N Calc !- ---�.,...,.. ------- ._ _ . , .... ...---- .....,. ..._. ... .--- -. ... .......... :�-- - -. ._---------- � Dcscription � SubArea ; Sub en :;_ _..---- ---..p�..: .._.__ _.--- _ --- (P ,.v..:.�,. ._ ___ __....__j._._....._......_:� _.-------- ------ ---.�.......___.---� ;�, lm cTvlous surfaces avemcnts,rooFs, etc } 0.34 �te ; 98.00 ; . �------__...,....�,r.�..�, _�_..__ ____......_.. _....,w. _. ..- -- -_..... ._.. _... .. ..--------- ; �...... .._. _..._ ._.__...r._... M.,' , �' (�l�en spaccs, lawns.p�rks (=75% gras5} Q,29 ac 6R.Op i! ..------------._._ . _____ __, ._ .. ----_.--- �� ._.. _._____!..--- -- ...._.. -- -�------....__._.__ .�� ,, Pervious Compc�sited CN (AMC 2) 84.19 , , ......._,.,.�.,_. __.._.___. ..... .. ,,,._ . . _..---- --- . ._ ._.. . _ . ..__ ___ _ .. -- _ --- ---- .................__ 4 � _..�._.....-- --------...T... .....__._.___ .._ .,..,....._. ----- �-- -------- - _.. _ _..._.._.._ _-- --- _�...,�.......---- � �.�..�.. � � ._.M....,. .. ------._,.w....... . ... .... .-- -. ..�.... __ _ _.__..- -------- __.._ ....._ .-----------._ . ..,._..... .._-- _ . . . . _ , �`. Pervious TC' C'alc � ...._ _ _ ..., . ._.,.. __... _ � w _.. _ . _. _ ; Ty pe ! Dc.ycription Lcngth Slope ; Coeff � M��c � TT ( _ ___ . _ .. _ . . _ ,.. ;Shcct �Shc�i� prairie �rass and l��irns. 0 15 iI2U.00 f t ,�,33% j0 15U0 2 0� in j9.04 min � ___ _. ,. . .... _ - -- _ •_ . �, _.. ,. ... 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