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HomeMy WebLinkAboutSWP272166 Short Plat (SHPL # ) REQUEST FOR PROJECT# Prelim. Plat (PP# ) CAG# To: Technical Services Date Q WO# BIS b-7 III# C-9—1 From: Plan Review/Prcject Manager �p�R�� V 'TTVAC,l(, Project Name Akuw,, /A LG" P�,IT �,�-Gj2oUE 11� (70 charactcs max) Description of Project: z4j Tm, s7z)gm FjG{6-rc6a,.rt/ 4cus,& OAA16-xf 7c�� Circle Size of Waterline: 8" 10" 12" Circle One: New or Extension Circle Size of Sewerline: 8" 10" 12" Circle One: New or Extension Circle Size of Stormline: 12" 15" 18" 24" Circle One: New or Extension Address or Street Name(s) /V6_ 0/91� COO, -- 6_ Dvlpr/Contractor/Owner/Cnslt: f (70 characters max) Check each discipline involved in Project Ltr Drwg # of sheets per discipline 03'Trans-Storm (Roadway/Drainage) (Offsite improvemcntsXincludc basin name) (include TESC sheets) C1 Transportation (Signaliration,Channclizatim lighting) O Wastewater (Sanitary Sewer Main)(include basin name) 2 Water (Mains,Valves.Hydrants) (Include composite&Horizontal Ctrl Sheets) TS Use Only a-I Approved by TSM Date. Corms/misc/92-090.DOC/CD/bh FOR DISTRIBUTION TO: k4 Water Utility Building Division �� Wastewater Utility Public Works Constr Inspector Surface Water Utility Fire Prevention Maintenance Services Transportation Systems Project: � � �U� 7---�L®./1 -� 17— Z166 Location: Attached please find copies of 0 PERMIT BILLS OF SALE 1 RECEIPT COST DATA INVENTORY LETTER OF SPECIAL BILLING EASEMENT(S) STUB SERVICE AGREEMENT COPY OF AS-BUILT PRECON NOTES PRECON ATTENDEES i DRAINAGE REPORT MEMO-WATER BREAKDOWN MAP WITH NEW MAINS AND VALVES OTHER From: Date: C:TB:PRECON:DISTFRM i ARLINDALE PLAT IMPROVEMENTS DRAINAGE ANALYSIS PREPARED FOR: TYDICO, INC. GARY SENESCU 17937 CEDAR GROVE RD. MAPLE VALLEY, WA. 98038-6220 (206) 413-1300 wy"pg W O PREPARED BY: HARMSEN AND ASSOCIATED, INC. 17614 - 162ND STREET SE P.O. BOX 51647 MONROE, WA 98272 JULY 20, 1994 _ EWWE& 3/13/1& INTRODUCTION This drainage analysis covers the proposed construction of SE 117th Street for the Arlindale plat located off Union Street in the City of Renton. The proposed improvements consist of the construction of a roadway consisting of two 10' lanes along the south property line with a hammerhead turnaround. METHODOLOGY The drainage calculations for the site were prepared using the requirements of the King County Surface Water Design Manual, (KCSWDM). The calculations are also based on soil mapping prepared by the USDA/SCS in their Soil Survey-King County Area, Washington, published in November, 1973. SCS curve numbers are taken from the Department of Ecology Storm Water Management for the Puget Sound Area, (DOE Manual). HYDROLOGIC DATA Runoff from the existing site sheet flows to a natural low point near lot 6 where it infiltrates into the ground. According to the SCS soil survey the subject site is underlain by Alderwood gravelly sandy loam. The Alderwood gravelly sandy loam is typified by a surface of very dark brown gravelly sandy loam 2"thick, a subsurface layer of dark brown gravelly sandy loam about 10"thick, a subsoil of grayish-brown gravelly sandy loam 15"thick, and a substratum of grayish-brown weakly to strongly consolidated till to a depth of 60". The DOE manual defines Alderwood gravelly sandy loam soils as hydrologic soil group C due to the consolidated nature of the substratum. A copy of the soils map is included at the end of this report. The rainfall events used in the calculations are the SCS Type 1A distribution of the 24 hour rainfall events for the 2-, 10-, 25-, and 100 year return periods. Total precipitation based on iso-pluvial maps from the KCSWDM are as follows: RETURN PERIOD RAINFALL 2 YEAR 2.0 INCH 10 YEAR 2.9 INCH 25 YEAR 3.4 INCH 100 YEAR 3.9 INCH EXISTING CONDITIONS The basin has the following land uses and areas: LAND USE CN AREA (AC) House 98 0.04 Young second Growth/Brush 81 0.89 Open Spaces-Fair Condition 90 0.89 Driveway (gravel) 89 0.09 TOTAL IMPERVIOUS AREA = 0.04 AC WITH CN = 98 TOTAL PERVIOUS AREA = 1.87 AC WITH WEIGHTED CN = 85.7 The flow path for the existing time of concentration calculation consists of the following: FLOW TYPE LENGTH (FT) SLOPE (FT/FT) "n"/"k" TIME (MIN) Sheet flow 60 0.033 n=0.17 7.45 Sheet flow 45 0.033 n=0.24 7.80 Sheet flow 95 0.0105 n=0.24 22.42 Sheet flow 100 0.035 n=0.24 14.43 Shallow 63 0.01 k=9 1.17 TIME OF CONCENTRATION = 53.27 MIN The existing site release rates: RETURN PERIOD PEAK RATE (CFS) VOLUME (AC-FT) 2 -YEAR 0.18 0.13 10 - YEAR 0.38 0.25 25 - YEAR 0.50 0.32 100 - YEAR 0.62 0.39 DEVELOPED CONDITIONS Runoff from the proposed roadway will sheetflow to a ditch along the north edge of the road, and be collected near the southeast property comer of lot 6. From this point it will be conveyed via a 12" HDPE pipe through the existing 30 foot easement along the east property line of lot 7, and the property immediately to the north, to a new catch basin which will be set over the existing storm drain line in NE 10th street. The developed basin has following land uses and areas: LAND USE CN AREA (AC) Houses 98 0.27 Roadway (asphalt) 98 0.35 Young second Growth/Brush 81 0.70 Open Spaces-Fair Condition 90 0.50 Driveway (gravel) 89 0.09 TOTAL IMPERVIOUS AREA = 0.63 AC WITH WEIGHTED CN = 98 TOTAL PERVIOUS AREA = 1.28 AC WITH WEIGHTED CN = 85.7 The flow path for the developed time of concentration calculation consists of the following: FLOW TYPE LENGTH (FT) SLOPE (FT/FT) "n"/"k" TIME (MIN) Sheet flow 60 0.033 n=0.17 7.45 Sheet flow 45 0.033 n=0.24 7.80 Sheet flow 95 0.0105 n=0.24 22.42 Sheet flow 75 0.035 n=0.24 11.46 Channelized 300 0.005 k=17 4.16 TIME OF CONCENTRATION = 53.29 MIN The developed site release rates: RETURN PERIOD PEAK RATE (CFS) VOLUME (AC-FT) 2 -YEAR 0.27 0.18 10 -YEAR 0.49 0.30 25 YEAR 0.61 0.38 100 - YEAR 0.74 0.45 CONCLUSION The proposed short plat improvements increase the storm water peak discharge rates and volumes as follows: RETURN PERIOD PEAK RATE (CFS) VOLUME (AC-FT) 2 -YEAR 0.09 0.05 10 -YEAR 0.11 0.05 25 YEAR 0.11 0.06 100 -YEAR 0.12 0.06 This increase in runoff from the 100 year storm is less than 0.5 cfs and will not require detention. Due to the level grade between the end of SE 117th Street and NE 10th Street the slope of the conveyance pipe between the ditch and the city storm drain system will need to be 0.0024 ft/ft. Using a pipe with a Manning's "N"value of 0.012 the maximum flow rate is 1.89 cfs, which is significantly more than the runoff from the 100 year storm. The ditch along SE 117th Street will be seeded to provide biofiltration prior to discharge from the site. Runoff from the future houses will be diverted to individual infiltration systems to be designed as part of the building permit process. Basin summaries and design calculations are included immediately following. 7/19/94 Harmsen & Assoc Inc. page 1 BASIN SUMMARY BASIN ID: EOOYR NAME: EXISTING 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPE1A PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 1. 87 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 . 27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0.04 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 . 00 ns: 0 . 1700 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 45 . 00 ns:0 . 2400 p2yr: 2 .00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 .2400 p2yr: 2.00 s:0.0105 TcReach - Sheet L: 100. 00 ns:0 .2400 p2yr: 2 . 00 s:0 .0350 TcReach - Shallow L: 63 . 00 ks: 9 .00 s: 0 .0100 PEAK RATE: 0. 62 cfs VOL: 0 . 39 Ac-ft TIME: 490 min BASIN ID: E10YR NAME: EXISTING 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPE1A PERVIOUS AREA PRECIPITATION. . . . : 2. 90 inches AREA. . : 1.87 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 .27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 04 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 60 . 00 ns:0. 1700 p2yr: 2. 00 s:0 .0330 TcReach - Sheet L: 45 .00 ns:0.2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 .2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 100 .00 ns:0 . 2400 p2yr: 2.00 s:0 . 0350 TcReach - Shallow L: 63 . 00 ks: 9.00 s:0 .0100 PEAK RATE: 0 .38 cfs VOL: 0 .25 Ac-ft TIME: 490 min BASIN ID: E25YR NAME: EXISTING 25 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : TYPE1A PERVIOUS AREA PRECIPITATION. . . . : 3 . 40 inches AREA. . : 1.87 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85. 70 TIME OF CONC. . . . . : 53 .27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 .04 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 .00 ns:0 . 1700 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0. 2400 p2yr: 2.00 s:0.0105 TcReach - Sheet L: 100 .00 ns:0 .2400 p2yr: 2.00 s:0.0350 TcReach - Shallow L: 63 .00 ks: 9 .00 s:0.0100 PEAK RATE: 0 .50 cfs VOL: 0 .32 Ac-ft TIME: 490 min 7/19/94 Harmsen & Assoc Inc. page 2 BASIN SUMMARY BASIN ID: E2YR NAME: EXISTING 2 YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS : 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2.00 inches AREA. . : 1. 87 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 .27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 .04 Acres CN. . . . . 98.00 TcReach - Sheet L: 60. 00 ns: 0 . 1700 p2yr: 2 .00 s:0.0330 TcReach - Sheet L: 45 .00 ns:0.2400 p2yr: 2 . 00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0.2400 p2yr: 2 . 00 s:0. 0105 TcReach - Sheet L: 100.00 ns:0 . 2400 p2yr: 2 . 00 s:0 .0350 TcReach - Shallow L: 63 .00 ks: 9.00 s:0 .0100 PEAK RATE: 0. 18 cfs VOL: 0 . 13 Ac-ft TIME: 490 min 7/19/94 Harmsen & Assoc Inc. page 1 BASIN SUMMARY BASIN ID: DOOYR NAME: DEVELOPED 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 1.28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85. 70 TIME OF CONC. . . . . : 53 . 29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0. 63 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 . 00 ns:0 . 1700 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 45 .00 ns:0 . 2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 .2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 75 . 00 ns:0 .2400 p2yr: 2 .00 s:0 .0350 TcReach - Channel L: 300. 00 kc: 17.00 s:0 .0050 PEAK RATE: 0 . 74 cfs VOL: 0.45 Ac-ft TIME: 490 min BASIN ID: D10YR NAME: DELEOPED 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 90 inches AREA. . : 1.28 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85 .70 TIME OF CONC. . . . . : 53 . 29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 63 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 . 00 ns:0 . 1700 p2yr: 2.00 s: 0.0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 95 .00 ns:0 . 2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 75 . 00 ns:0 .2400 p2yr: 2.00 s:0.0350 TcReach - Channel L: 300 . 00 kc: 17. 00 s:0 .0050 PEAK RATE: 0 . 49 cfs VOL: 0.30 Ac-ft TIME: 490 min BASIN ID: D25YR NAME: DEVELOPED 25 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 .40 inches AREA. . : 1.28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 .29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 63 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 . 00 ns:0 . 1700 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0.2400 p2yr: 2.00 s:0.0105 TcReach - Sheet L: 75 .00 ns:0 .2400 p2yr: 2.00 s:0.0350 TcReach - Channel L: 300 .00 kc: 17 .00 s:0 .0050 PEAK RATE: 0 . 61 cfs VOL: 0 .38 Ac-ft TIME: 490 min 7/19/94 Harmsen & Assoc Inc. page 2 BASIN SUMMARY BASIN ID: D2YR NAME: DEVELOPED 2 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 .00 inches AREA. . : 1. 28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 .29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 0 . 63 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 .00 ns: 0 . 1700 p2yr: 2 .00 s:0.0330 TcReach - Sheet L: 45 .00 ns: 0. 2400 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 95.00 ns:0.2400 p2yr: 2 . 00 s:0.0105 TcReach - Sheet L: 75 . 00 ns:0 .2400 p2yr: 2.00 s: 0 .0350 TcReach - Channel L: 300.00 kc: 17.00 s:0.0050 PEAR RATE: 0 .27 cfs VOL: 0 . 18 Ac-ft TIME: 490 min SEC 10, TWP 23 N, ROE 5 E, WM _ _-----_—___—__---_----_---------- --___—_--NE IOIH STREEI--_---------_---_—_—__--_—_ -- ______ av I ~� I I I 30 _E?ClSTtNG fLov��A�la 2 I I I I I i 1 Z' 1 L01]lue Aft[YSMn WYSF I I I 1 I s um oel.ws ulur[z rew uL rum smell,1 1--------------- nrsxol ev,lcrto errnx t;pveiell[nnM K SL >M el. 1 1 I , 1 I 1 I ' 1 I � 1 wL55 bl r S 1 , 1 1 1 1 I 3 5 6 7 \2\( 1 1 30 L � I Iro •� a (— — '--_,-- ----I�ai---- -- --- �ISoa-- ----�--- -- — -A-'_ 1 1 /1"L J -•�sros _ CITY OF RENTON _ pfiP ARTA1fiNT OF PUBLIC WORH5 _ MISSION HILLS SUBDIVISION A LV�L�AFVll M 0 - - WATER UTILI IY PLAN 1 J,NOTES HARMS EN dL ASSOCIATES. P1DI10'.�'IeMLL CIYL eMEMlJrIMG IAm LANry,IIIIKIINC Lam...(� %•t 1'.� �N a�.l..l,a.�. pt NYW J1rOI! IllmpWyl wMif IrW _ _ NILJ____O_L Ir.re Circular Channel Analysis & Design Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: ARLINDALE PIPE Comment: ARLINDALE CONVEYANCE PIPE Solve For Full Flow Capacity Given Input Data: Diameter. . . . . . . . . . 1.00 ft Slope. . . . . . . . . . . . . 0.0024 ft/ft Manning's n. . . . . . . 0.012 Discharge. . . . . . . . . 1.89 cfs Computed Results: Full Flow Capacity. . . . . 1.89 cfs Full Flow Depth. . . . . . . . 1.00 ft Velocity. . . . . . . . . . 2.41 fps Flow Area. . . . . . . . . 0.79 sf Critical Depth. . . . 0.59 ft Critical Slope. . . . 0.0057 ft/ft Percent Full. . . . . . 100.00 % Full Capacity. . . . . 1.89 cfs QMAX @.94D. . . . . . . . 2.03 cfs Froude Number. . . . . FULL Open Channel Flow Module, Version 3.21 (c) 1990 Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708 EATTLE!CITY P.O.)10 MI.]290" a MI. 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T'ai.y •�..Q� ,` '].i ._ _M 11 �1,�'if' ' • C•{�'Y I�. ,_ IFAg. Wii., �+�i7. } 5 it,1Af•r• r� , Nl i� (, MLA'::•£• e 2 •i.Tom` �♦ •�+�.I+ t'r •Y +iF, i( r., +,•� �� ' ���/ , k•"`t '�`�,• %� '•.\`'•.AgC 1� _� o ^) ♦,a � Age— �,-]�.�• fr• '�i'Ii4+�.•2- DESCRIPTIONS OF THE SOILS This section describes the soil series and map- Aldervood soils are used for timber, pasture, ping units in the King County Area. Each soil berries, row crops, and urban development. They series is described and then each mapping unit in are the most extensive soils in the survey area. that series. Unless it is specifically mentioned otherwise, it is to be assumed that what is stated Alderwood gravelly sandy loam, 6 to 15 percent about the soil series holds true for the mapping slopes (AgC) .--This soil is rolling. Areas are units in that series. Thus, to get full information irregular in shape and range from 10 to about 600 about any one mapping unit, it is necessary to read acres in size. both the description of the mapping unit and the Representative profile of A1den400d gravelly description of the soil series to which it belongs. sandy loam, 6 to 15 percent slopes, in woodland, An important part of the description of each 450 feet east and 1,300 feet south of tha north soil series is the soil profile, that is, the quarter corner of sec. 15, T. 24 N. , R. 6 E. : sequence of layers from the surface downward to rock or other underlying material. Each series Al--0 to 2 inches, very dark brown (10YR 2/2) contains two descriptions of this profile. The gravelly sandy loam, dark grayish brown first is brief and in terms familiar to the layman. (10YR 4/2) dry; weak, fine, granular struc- The second, detailed and in technical terms, is for ture; slightly hard, friable, nonsticky, scientists, engineers, and others who need to make nonplastic; many roots; strongly acid; thorough and precise studies of soils. Unless it abrupt, wavy boundary. 1 to 3 inches thick. is otherwise stated, the colors given in the B2--2 to 12 inches, dark-brown (10YR 4/3) gravelly descriptions are those of a moist soil. sandy loam, brown (10YR 5/3) dry; moderate, As mentioned in the section "How This Surrey Was medium, subangular blocky structure; slightly Made," not all mapping units are members of a soil hard, friable, nonsticky, nonplastic; many series. Urban land, for example, does not belong roots; strongly acid; clear, wavy boundary. to a soil series, but nevertheless, is listed in 9 to 14 inches thick. alphabetic order along with the soil series. B3--12 to 27 inches, grayish-brown (2.5Y 5/2) Following the name of each mapping unit is a gravelly sandy loam, light gray (2.5Y 7/2) symbol in parentheses. This symbol identifies the dry; many, medium, distinct mottles of light mapping unit on the detailed soil map. Listed at olive brown (2.5Y 5/6) ; hard, friable, non- the end of each description of a mapping unit is the sticky, nonplastic; many roots; medium acid; capability unit and woodland group in which the abrupt, wavy boundary. 12 to 23 inches thick. mapping unit has been placed. The woodland desig- IIC--27 to 60 inches, gravish-brown (2.5Y 5/2) , nation and the page for the description of each weakly to strongly consolidated till, light capability unit can be found by referring to the gray (2.5Y 7/2) dry; common, medium, distinct "Guide to Mapping Units" at the back of this surrey. mottles of light olive brown and ,yellowish The acreage and proportionate extent of each brown (2.5Y 5/6 and 10YR 5/6) ; massive; no mapping unit are shown in table 1. Many of the roots; medium acid. Many feet thick. terms used in describing soils can be found in the Glossary at the end of this surrey, and more de- The A horizon ranges from very dark brown to tailed information about the terminology and methods dark brown. The B horizon is dark brown, grayish of soil mapping can be obtained from the Soil Survey brown, and dark yellowish brown. The consolidated Manual (19) . C horizon, at a depth of 24 to 40 inches, is mostly grayish brown mottled with yellowish brown. Some lavers in the C horizon slake in water. In a few Alderwood Series areas, there is a thin, gray or grayish-brown A2 The Alderwood series is made up of moderately horizon. In most areas, this horizon has been well drained soils that have a weakly consolidated destroyed through logging operations. to strongly consolidated substratum at a depth of Soils included with this soil in mapping make up 24 to 40 inches. These soils are on uplands. They no more than 30 percent of the total acreage. Some formed under conifers, in glacial deposits. Slopes areas are up to 3 percent the poorly drained Norma, are 0 to 70 percent. The annual precipitation is Bellingham, Seattle, Tukwila, and Shalcar soils; 35 to 60 inches, most of which is rainfall, between some are up to S percent the very gravelly Everett October and May. The mean annual air temperature is and Neilton soils; and some are up to 15 percent about 50° F. The frost-free season is 150 to 200 Alderwood soils that have slopes more gentle or days. Elevation ranges from 100 to 800 feet. steeper than 6 to 15 percent. Some areas in New- In a representative profile, the surface laver castle Hills are 25 percent Beausite soils, some and subsoil are very dark brown, dark-brown, and northeast of Duvall are as much as 25 percent Ovall grayish-brown gravelly sandy loam about 27 inches soils, and some in the vicinity of Dash Point are thick. The substratum is grayish-brown, weakly 10 percent Indianola and Kitsap soils. Also consolidated to strongly consolidated glacial till included are small areas of Alderwood soils that that extends to a depth of 60 inches and more. have a gravelly loam surface layer and subsoil. Permeability is moderately rapid in the surface layer and subsoil and very slow in the substratum. Roots penetrate easily to the consolidated substTa- 8 tum where they tend to mat on the surface. Some roots enter the substratum through cracks. Water moves on top of the substratum in winter. Available water capacity is low. Runoff is slow to medium, and the hazard of erosion is moderate. This soil is used for timber, pasture, berries, and row crops, and for urban development. Capability Unit TVA-7• wnndI anti a-rn.... :A i FOR DISTRIBUTION TO: Water Utility Building Division Wastewater Utility Public Works Constr Inspector Surface Water Utility Fire Prevention Maintenance Services Transportation Systems ` Project: Location: �J Attached please find copies of PERMIT BILLS OF SALE RECEIPT COST DATA INVENTORY LETTER OF SPECIAL BILLING ® EASEMENT(S) STUB SERVICE AGREEMENT COPY OF AS-BUILT PRECON NOTES PRECON ATTENDEES DRAINAGE REPORT MEMO-WATER BREAKDOWN MAP WITH NEW MAINS AND VALVES OTHER From: �f/Ii Date: plat CTD,PRECON:DISTFRM 1 � e ARLINDALE PLAT IMPROVEMENTS DRAINAGE ANALYSIS PREPARED FOR: TYDICO, INC. GARY SENESCU 17937 CEDAR GROVE RD. MAPLE VALLEY, WA. 98038-6220 (206) 413-1300 c rC PREPARED BY: HARMSEN AND ASSOCIATED, INC. Z 17614- 162ND STREET SE P.O. BOX 516 29747 4 MONROE, WA 98272 OMAL JULY 20, 1994 p rDmm 3/13/ !�p INTRODUCTION This drainage analysis covers the proposed construction of SE 117th Street for the Arlindale plat located off Union Street in the City of Renton. The proposed improvements consist of the construction of a roadway consisting of two 10' lanes along the south property line with a hammerhead turnaround. METHODOLOGY The drainage calculations for the site were prepared using the requirements of the King County Surface Water Design Manual, (KCSWDM). The calculations are also based on soil mapping prepared by the USDA/SCS in their Soil Survey-King County Area, Washington, published in November, 1973. SCS curve numbers are taken from the Department of Ecology Storm Water Management for the Puget Sound Area, (DOE Manual). HYDROLOGIC DATA Runoff from the existing site sheet flows to a natural low point near lot 6 where it infiltrates into the ground. According to the SCS soil survey the subject site is underlain by Alderwood gravelly sandy loam. The Alderwood gravelly sandy loam is typified by a surface of very dark brown gravelly sandy loam 2"thick, a subsurface layer of dark brown gravelly sandy loam about 10"thick, a subsoil of grayish-brown gravelly sandy loam 15"thick, and a substratum of grayish-brown weakly to strongly consolidated till to a depth of 60". The DOE manual defines Alderwood gravelly sandy loam soils as hydrologic soil group C due to the consolidated nature of the substratum. A copy of the soils map is included at the end of this report. The rainfall events used in the calculations are the SCS Type 1A distribution of the 24 hour rainfall events for the 2-, 10-, 25-, and 100 year return periods. Total precipitation based on iso-pluvial maps from the KCSWDM are as follows: RETURN PERIOD RAINFALL 2 YEAR 2.0 INCH 10 YEAR 2.9 INCH 25 YEAR 3.4 INCH 100 YEAR 3.9 INCH EXISTING CONDITIONS The basin has the following land uses and areas: LAND USE CN AREA (AC) House 98 0.04 Young second Growth/Brush 81 0.89 Open Spaces-Fair Condition 90 0.89 Driveway (gravel) 89 0.09 TOTAL IMPERVIOUS AREA = 0.04 AC WITH CN = 98 TOTAL PERVIOUS AREA = 1.87 AC WITH WEIGHTED CN = 85.7 The flow path for the existing time of concentration calculation consists of the following: FLOW TYPE LENGTH (FT) SLOPE (FT/FT) "n"/"k" TIME (MIN) Sheet flow 60 0.033 n=0.17 7.45 Sheet flow 45 0.033 n=0.24 7.80 Sheet flow 95 0.0105 n=0.24 22.42 Sheet flow 100 0.035 n=0.24 14.43 Shallow 63 0.01 k=9 1.17 TIME OF CONCENTRATION = 53.27 MIN The existing site release rates: RETURN PERIOD PEAK RATE (CFS) VOLUME (AC-FT) 2 -YEAR 0.18 0.13 10 -YEAR 0.38 0.25 25 -YEAR 0.50 0.32 100 -YEAR 0.62 0.39 DEVELOPED CONDITIONS Runoff from the proposed roadway will sheetflow to a ditch along the north edge of the road, and be collected near the southeast property corner of lot 6. From this point it will be conveyed via a 12" HDPE pipe through the existing 30 foot easement along the east property line of lot 7, and the property immediately to the north, to a new catch basin which will be set over the existing storm drain line in NE 10th street. The developed basin has following land uses and areas: LAND USE CN AREA (AC) Houses 98 0.27 Roadway (asphalt) 98 0.35 Young second Growth/Brush 81 0.70 Open Spaces-Fair Condition 90 0.50 Driveway (gravel) 89 0.09 TOTAL IMPERVIOUS AREA = 0.63 AC WITH WEIGHTED CN = 98 TOTAL PERVIOUS AREA = 1.28 AC WITH WEIGHTED CN = 85.7 The flow path for the developed time of concentration calculation consists of the following: FLOW TYPE LENGTH (FT) SLOPE (FT/FT) "n"/"k" TIME (MIN) Sheet flow 60 0.033 n=0.17 7.45 Sheet flow 45 0.033 n=0.24 7.80 Sheet flow 95 0.0105 n=0.24 22.42 Sheet flow 75 0.035 n=0.24 11.46 Channelized 300 0.005 k=17 4.16 TIME OF CONCENTRATION = 53.29 MIN The developed site release rates: RETURN PERIOD PEAK RATE (CFS) VOLUME (AC-FT) 2 - YEAR 0.27 0.18 10 -YEAR 0.49 0.30 25 YEAR 0.61 0.38 100 - YEAR 0.74 0.45 CONCLUSION The proposed short plat improvements increase the storm water peak discharge rates and volumes as follows: RETURN PERIOD PEAK RATE (CFS) VOLUME (AC-FT) 2 -YEAR 0.09 0.05 10 -YEAR 0.11 0.05 25 YEAR 0.11 0.06 100 -YEAR 0.12 0.06 This increase in runoff from the 100 year storm is less than 0.5 cfs and will not require detention. Due to the level grade between the end of SE 117th Street and NE 10th Street the slope of the conveyance pipe between the ditch and the city storm drain system will need to be 0.0024 ft/ft. Using a pipe with a Manning's "N" value of 0.012 the maximum flow rate is 1.89 cfs, which is significantly more than the runoff from the 100 year storm. The ditch along SE 117th Street will be seeded to provide biofiltration prior to discharge from the site. Runoff from the future houses will be diverted to individual infiltration systems to be designed as part of the building permit process. Basin summaries and design calculations are included immediately following. 7/19/94 Harmsen & Assoc Inc. page 1 BASIN SUMMARY BASIN ID: EOOYR NAME: EXISTING 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 1. 87 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 .27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 .04 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 60 .00 ns:0 . 1700 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2 .00 s:0 . 0330 TcReach - Sheet L: 95 .00 ns:0 . 2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 100 . 00 ns:0 . 2400 p2yr: 2.00 s:0 .0350 TcReach - Shallow L: 63 . 00 ks: 9 .00 s:0.0100 PEAK RATE: 0 . 62 cfs VOL: 0 .39 Ac-ft TIME: 490 min BASIN ID: E10YR NAME: EXISTING 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2. 90 inches AREA. . : 1. 87 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85 .70 TIME OF CONC. . . . . : 53 . 27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0.04 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 .00 ns:0 . 1700 p2yr: 2 .00 s: 0.0330 TcReach - Sheet L: 45 . 00 ns:0. 2400 p2yr: 2 .00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 . 2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 100.00 ns:0 .2400 p2yr: 2.00 s:0 .0350 TcReach - Shallow L: 63.00 ks: 9. 00 s:0 .0100 PEAK RATE: 0 .38 cfs VOL: 0 .25 Ac-ft TIME: 490 min BASIN ID: E25YR NAME: EXISTING 25 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 .40 inches AREA. . : 1.87 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85 .70 TIME OF CONC. . . . . : 53 .27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 .04 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 . 00 ns:0. 1700 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 .2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 100 .00 ns:0. 2400 p2yr: 2.00 s:0.0350 TcReach - Shallow L: 63 .00 ks: 9 . 00 s:0 .0100 PEAK RATE: 0 .50 cfs VOL: 0 .32 Ac-ft TIME: 490 min 7/19/94 Harmsen & Assoc Inc. page 2 BASIN SUMMARY BASIN ID: E2YR NAME: EXISTING 2 YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS : 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 00 inches AREA. . : 1. 87 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 .27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0.04 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60.00 ns: 0. 1700 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 45.00 ns:0. 2400 p2yr: 2 . 00 s: 0.0330 TcReach - Sheet L: 95 .00 ns:0. 2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 100.00 ns: 0 . 2400 p2yr: 2.00 s:0.0350 TcReach - Shallow L: 63 . 00 ks: 9.00 s:0 .0100 PEAK RATE: 0 . 18 cfs VOL: 0 . 13 Ac-ft TIME: 490 min 7/19/94 Harmsen & Assoc Inc. page 1 BASIN SUMMARY BASIN ID: DOOYR NAME: DEVELOPED 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : TYPE1A PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 1.28 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 85. 70 TIME OF CONC. . . . . : 53 .29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 63 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 .00 ns:0. 1700 p2yr: 2.00 s: 0 .0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2 .00 s: 0 .0330 TcReach - Sheet L: 95 . 00 ns: 0 .2400 p2yr: 2.00 s:0 .0105 TcReach - Sheet L: 75 . 00 ns: 0 .2400 p2yr: 2.00 s:0 .0350 TcReach - Channel L: 300 .00 kc: 17.00 s:0.0050 PEAK RATE: 0 . 74 cfs VOL: 0 .45 Ac-ft TIME: 490 min BASIN ID: D10YR NAME: DELEOPED 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPE1A PERVIOUS AREA PRECIPITATION. . . . : 2. 90 inches AREA. . : 1.28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85. 70 TIME OF CONC. . . . . : 53 . 29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 63 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 60 .00 ns:0 . 1700 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 45 .00 ns:0 .2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 .2400 p2yr: 2.00 s:0.0105 TcReach - Sheet L: 75 .00 ns:0.2400 p2yr: 2.00 s:0 . 0350 TcReach - Channel L: 300 . 00 kc: 17.00 s:0 .0050 PEAK RATE: 0 . 49 cfs VOL: 0.30 Ac-ft TIME: 490 min BASIN ID: D25YR NAME: DEVELOPED 25 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPE1A PERVIOUS AREA PRECIPITATION. . . . : 3 .40 inches AREA. . : 1. 28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 .70 TIME OF CONC. . . . . : 53 .29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0. 63 Acres CN. . . . . 98.00 TcReach - Sheet L: 60 . 00 ns:0 . 1700 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 45 .00 ns: 0 .2400 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 95 .00 ns:0 .2400 p2yr: 2.00 s:0.0105 TcReach - Sheet L: 75.00 ns:0.2400 p2yr: 2.00 s: 0.0350 TcReach - Channel L: 300 .00 kc:17 .00 s:0 .0050 PEAK RATE: 0 . 61 cfs VOL: 0.38 Ac-ft TIME: 490 min 7/19/94 Harmsen & Assoc Inc. page 2 BASIN SUMMARY BASIN ID: D2YR NAME: DEVELOPED 2 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 91 Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 .00 inches AREA. . : 1. 28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 70 TIME OF CONC. . . . . : 53 . 29 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 63 Acres CN. . . . . 98 .00 TcReach - Sheet L: 60 .00 ns:0 . 1700 p2yr: 2.00 s:0 .0330 TcReach - Sheet L: 45 . 00 ns: 0 . 2400 p2yr: 2.00 s:0.0330 TcReach - Sheet L: 95 .00 ns: 0 . 2400 p2yr: 2.00 s: 0 .0105 TcReach - Sheet L: 75 .00 ns:0 .2400 p2yr: 2 .00 s:0.0350 TcReach - Channel L: 300 .00 kc: 17 .00 s:0 .0050 PEAK RATE: 0 . 27 cfs VOL: 0 . 18 Ac-ft TIME: 490 min [[MC SEC 10, TWP 23 N. RCE 5 K Wh! _—__--_____—_____—_____—_______—_ _—_____—NE IOTN STREET —_____.____________________ av 1 O I M 11 1 ------------------- --—--—--—--—--—- -T-—--—--—--—--—T-—--—--—--—--—T-—--—- T ----� I 30 f$Lcvj Pic.. [xlST�NG I w P i i -- PKoP©sEQ �t.�c► I 1 i i 2 Z I t01}NAS AH FYSIMG YNSC 1 i Y}(11 OBIAwS KC[SS AM I I I i f �' YIUBFS YBYY NF IYM SnItF), � IT IS N01 W ACRD BY BE Z I �__—_—__ I I 1 ------- CLYISIAKP(M YYY11)BI ST. I 1 I I I 1 1 1 1 I 1 ti I ; •` 1 W) I 1 1 1 1 f 1 I ✓ r - L 11 I L 1 4 3 6 1 I F 14 30 1 ----yoo------t---- ) EGA-,- l 1 I 1 L.J L_J }mslBam vs _ CITY OF RENTON DEPARTMENT OF Pua,c WDR.s MISSION 111LIS SUBDIVISION I IssuO/g�{dEL ow - WATER URUTY MAN 1 k NOTES 1 '+ _ow I5B-07-N IIARAISEN I ASSOCIATES, INC. y1p111�pMAL LIYLL fM:MW,F IM•LtM„IYBViYPC � ,1 ro Circular Channel Analysis & Design Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: ARLINDALE PIPE Comment: ARLINDALE CONVEYANCE PIPE Solve For Full Flow Capacity Given Input Data: Diameter. . . . . . . . . . 1.00 ft Slope. . . . . . . . . . . . . 0.0024 ft/ft Manning's n. . . . . . . 0.012 Discharge. . . . . . . . . 1.89 cfs Computed Results: Full Flow Capacity. . . . . 1.89 cfs Full Flow Depth. . . . . . . . 1.00 ft Velocity. . . . . . . . . . 2.41 fps Flow Area. . . . . . . . . 0.79 sf Critical Depth. . . . 0.59 ft Critical Slope. . . . 0.0057 ft/ft Percent Full. . . . . . 100.00 % Full Capacity. . . . . 1.89 cfs QMAX @.94D. . . . . . . . 2.03 cfs Froude Number. . . . . 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They series is described and then each mapping unit in are the most extensive soils in the survey area. that series. Unless it is specifically mentioned otherwise, it is to be assumed that what is stated Alderaood gravelly sandy loam, 6 to 15 percent about the soil series holds true for the mapping slopes (AgC) .--This soil is rolling. Areas are units in that series. Thus, to get full information ir_'egular in shape and range from 10 to about 600 about any one mapping unit, it is necessary to read acres in size. both the description of the mapping unit and the Representative profile of A1der.Jood gravelly description of the soil series to which it belongs. sandy loam, 6 to 15 percent slopes, in woodland, An important part of the description of each 450 feet east and 1,300 feet south of the north soil series is the soil profile, that is, the quarter corner of sec. 15, T. 24 N. , R. 6 E. : sequence of layers from the surface downward to rock or other underlying material. Each series Al--0 to 2 inches, very dark brown (10YR 2/2) contains two descriptions of this profile. The gravelly sandy loam, dark grayish brown first is brief and in terms familiar to the layman. (10YR 4/2) dry; weak, fine, granular struc- T'he second, detailed and in technical terns, is for ture; slightly hard, friable, nonsticky, scientists, engineers, and others who need to make nonplastic; many roots; strongly acid; thorough and precise studies of soils. Unless it abrupt, wavy boundary. 1 to 3 inches thick. is otherwise stated, the colors given in the 32--2 to 12 inches, dark-brown (10YR 4/3) gravelly descriptions are those of a moist soil. sandy loam, brown (10YR 5/3) dry; moderate, As mentioned in the section "How This Surrey Was medium, subangular blocky stricture; slightly Made," not all mapping units are members of a soil hard, friable, nonsticky, nonelastic; many series. Urban land, for example, does not belong roots; strongly acid; clear, wavy boundary. to a soil series, but nevertheless, is listed in 9 to 14 inches thick. alphabetic order along with the soil series. B3--12 to 27 inches, grayish-brown (2.5Y 5/2) Following the name of each mapping unit is a gravelly sandy loam, light gray (2.5Y 7/2) symbol in parentheses. This symbol identifies the dry; many, medium, distinct mottles of light mapping unit on the detailed soil map. Listed at olive brown (2.5Y 5/6) ; hard, friable, non- the end of each description of a mapping unit is the sticky, nonplastic; many roots; medium acid; capability unit and woodland group in which the abrupt, wavy boundary. 12 to 23 inches thick. mapping unit has been placed. The woodland desig- IIC--27 to 60 inches, grayish-brown (2.5Y 5/2) , nation and the page for the description of each weakly to strongly consolidated till, light capability unit can be found by referring to the gray (2.5Y 7/2) dry; common, medium, distinct "Guide to dapping Units" at the back of this surrey. mottles of light olive brown and yellowish The acreage and proportionate extent of each brown (2.SY 5/6 and 10YR 5/6) ; massive; no mapping unit are shown in table 1. Many of the roots; medium acid. Many feet thick. terms used in describing soils can be found in the Glossary at the end of this surrey, and more de- The A horizon ranges from very dark brown to tailed information about the terminology and methods dark brown. The B horizon is dark brown, grayish of soil mapping can be obtained from the Soil Survey brown, and dark yellowish brown. The consolidated Manual (19) . C horizon, at a depth of 24 to 40 inches, is mostly grayish brown mottled with yellowish brown. Some A1denvood Series lavers in the C horizon slake in water. In a few areas, there is a thin, gray or grayish-brown A2 The Alderwood series is made up of moderately horizon. In most areas, this horizon has been well drained soils that have a weakly consolidated destroyed through logging operations. to strongly consolidated substratum at a depth of Soils included with this soil in mapping make up 24 to 40 inches. These soils are on uplands. They no more than 30 percent of the total acreage. Some formed under conifers, in glacial deposits. Slopes areas are up to 3 percent the poorly drained Norma, are 0 to 70 percent. The annual precipitation is Bellingham, Seattle, Tukwila, and Shalcar soils; 35 to 60 inches, most of which is rainfall, between some are up to 5 percent the very gravelly Everett October and May. The mean annual air temperature is and Neilton soils; and some are up to 15 percent about SO* F. The frost-free season is 150 to 200 Alderwood soils that have slopes more gentle or days. Elevation ranges from 100 to 300 feet. steeper than 6 to 15 percent. Some areas in New- In a representative profile, the surface layer castle Hills are 2S percent Beausite soils, some and subsoil are very dark brown, dark-brown, and northeast of Duvall are as much as 25 percent Ovall grayish-brown gravelly sandy loam about 27 inches soils, and some in the vicinity of Dash Point are thick. The substratum is grayish-brown, weakly 10 percent Indianola and Kitsap soils. Also consolidated to strongly consolidated glacial till included are small areas of Alderwood soils that that extends to a depth of 60 inches and more. have a gravelly loam surface layer and subsoil. Permeability is moderately rapid in the surface layer and subsoil and very slow in the substratum. Roots penetrate easily to the consolidated substra- $ tum where they tend to mat on the surface. Some roots enter the substratum through cracks. Water moves on top of the substratum in winter. Available water capacity is low. Runoff is slow to medium, and the hazard of erosion is moderate. This soil is used for timber, pasture, berries, and row crops, and for urban development. Capability