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HomeMy WebLinkAboutDrainage Report - PLN General - 7/15/2002 Michael F. Wnek, P.E., PS Consulting Civil Engineer 1665 NW Sherwood Drive, Bremerton, WA 98311, 360-692-3802 RECEIVED DRAINAGE REPORT ►,lUL 19 2002 FOR 426 W: CEDAR ST. GENERAL SITE GRADING & DEVELOPMENT OF THE DELONG PARCEL ADDITION for the CORBIT SITE Mason County, Washington Prepared for: Jack& Steve Johnson P.O. Box 1119 Belfair, Washington 98528 360-275-5400 CONTENTS Tab-1..................... Drainage Narrative Tab-2..................... Support Documentation Tab-3..................... Retention Pond Engineering Calculations Prepared by: �L F WA H/ Michael F. Wnek, P.E., PS 1665 NW Sherwood Drive p Bremerton, WA 98311-8941 (360)-692-3802 02 660 0� July 15, 2002 ss oNqLRE��'\�� Project#: 209 EXPIRES 07/13/03 I a3a - L4 a - '10083 DULONG PARCEL ADDITION Michael F. Wnek, P.E. PS Corbit Site, Mason County Drainage Report July 15,2002 Tab-1 Drainage Narrative TABLE OF CONTENTS Page 1. Project Description& Information.......................................................................... 1 2. Downstream Conditions............................................................................................. 2 3. Existing Condition Basins.......................................................................................... 2 4. Soils............................................................................................................................ 2 5. Drainage Concept& Development Conditions.......................................................... 3 6. Water Quality............................................................................................................. 4 7. Erosion Control.......................................................................................................... 4 DELONG PARCEL ADDITION ' Mfehset,F.Wnek, P.E. PS Corbit Site,Mason County Drainage Report My-15,2002 1. Project Description & Information: Overview: This parcel adjoins the "Corbit Site," a 43 acre site to the south & west that was permitted for clearing and grading operations in 1995. Stormwater quantity control for the Corbit Site is provided by an infiltration pond at the south end of the site (see: Phase-II Drainage Report for General Site Grading **Revision No. 1**, 10-27-1995, Olympic Engineering Inc.). The stormwater controls for the subject parcel (herein referred to as the "DeLong Site") are designed as a stand-alone facility, and will only use the Corbit pond as an emergency overflow outlet for events larger than the design event. Project Location: T 23 N, R 1 W, W.M., SECTION 21 Assessor's Parcel #: 12321-42-00080 Developer: Jack & Steve Johnson Parcel Acreage: 8.8 acres Development Type: Commercial,to be developed in phases: Phase-I Land Clearing& Erosion Control Phase-II Grading/ Drainage Phase-III Building/Paving This design report takes into account all three phases. Actual site plans for Phase III have not been prepared. However, generous percentages of impervious area are applied to the hydrology calculations, so that the pond will function properly under most development scenarios. Due to the amount of imported fill required to complete the designed grading, there is no specific timeline as to when Phase III will occur. Since infiltration of all storm runoff is proposed, (there will be no off-site storm discharges designed)the design of the pond should be relatively immune from changes in storm water control regulations. General Information: The project is located in northeast Mason County. The existing access point is from State Highway 3 northeast of the railroad overpass; approximately 600 feet southwest of the Log Yard Road intersection. The subject parcel is bounded to the east by State Highway 3, to the south and west by the "Corbit Site", and to the north by a landscaping materials supply business. The site vegetation is second growth timber with substantial brush and ground cover. The property was logged within the last 10 years. There are some remaining pockets of merchantable timber. t DELONG PARCEL ADDITION Michael F.Wnek,P.E. PS Corbit Site;.Mason County Drainage Report July 15,2002 Topography& Basin Delineation: The general topography of the vicinity is irregular and is characterized by many closed depressions. Within the DeLong parcel, runoff eventually accumulates in the low area near the mid-point of the south property line. The landscaping materials supply site to the north is self- contained and does not discharge any storm runoff onto the subject parcel. The project parcel is designated as a single basin for hydrology calculations. There is one upstream basin that flows into the project parcel through a culvert under State Highway 3. Since the topography is relatively flat throughout the area, the USGS topography maps do not adequately show the drainage patterns for the upstream basin. The limits of the upstream basin were determined by field investigation, and are portrayed on the attached Basin Plan as "Basin-C". East of Basin-C, storm runoff drains easterly to other small closed depressions. 2. Downstream Conditions: The project parcel contains the lowest elevation in the vicinity, therefore downstream effects are non-existent. However, in order to avoid possible flooding conditions (after Phase III is completed) an overflow outlet is necessary when conditions exceed the most severe design condition: the 100- year, 24-hour storm event. 3. Existing Condition Basins: Since infiltration is used for storm runoff quantity controls, and no off-site discharges are proposed, hydrology calculations for the existing conditions of the project parcel are not-applicable. However, hydrology calculations of the existing condition of the upstream basin are necessary in order to size the pond adequately. In addition, peak discharges for the upstream basin, calculated for the existing condition, will also designate the permitted storm discharges form this area that are allowed if the upstream area becomes developed. Basin-C: This is the upstream basin. The area has been logged recently. For hydrology calculations the land cover is considered to be second growth forest. The only impervious area within this basin is the pavement of the State highway. 4. Soils: The soil type within the project site is mostly of the Everett Gravely Loamy Sand series, or the Indianola Loamy Sand series. These soils are considered Hydrologic Soil Group "A" for runoff calculations. The soils maps indicate an area of Alderwood Gravelly Loam along the eastern portion of the project parcel, and in the upstream basin. Alderwood soils fall under Hydrologic Soil Group "C". Inspection of the State Highway culvert that drains the upstream Basin-C does not show substantial storm flow activity. Also, the closed depression topography continues to the east of 2 DELONG PARCEL ADDITION Michael F.;Wnek, P.E. PS Corbit Site,Masan County -:Drain age"Report Inly 15,2002 Basin-C, with no apparent permanent water accumulation (ponds). It appears justifiable to consider the Alderwood soils in this area as Group "A" for these calculations. One soils exploration hole was dug in the area near the proposed infiltration pond. The location is shown on the Basin Plan. Soil Log: DELONG #1 Elevation Elevation From To Soils Description 88 86 Brown loamy sand, no gravel, loose (SM) 86 84 Brown-gray medium sand, moderately compact, no gravel (SP) 84 83 Brown-gray medium sand, compact, no gravel SP), 83 81 Brown-gray medium & coarse sand, moderately compact, gravel to 1.5" diameter SP or GP ■ Stopped at 7' depth due to difficulty digging through gravel with hand corer. ■ No seepage. No mottled soils. ■ No silt or clay lenses. Existing cut banks were investigated north and south of the project parcel. Similar layering of sands and gravels were observed. It can be safely assumed that similar soils are available in the proposed retention pond area to the design depth. 5. Drainage Concept & Development Conditions: Streambank erosion control and water quality control are required for the storm runoff on this project, due to the size and scope. Stream bank erosion control (quantity control) can be accomplished using an infiltration (retention) pond. Since the native soil contains both sand and coarse sand, an infiltration rate for sand is used, however the safety factor is set to 1; instead of averaging the values for sand and coarse-sand and using the standard safety factor of 2. (Similar methodology was used in the design of the infiltration pond for the Corbit Site.) For the developed condition, the Delong basin is considered 75% impervious area, and 25% lawn and landscaping. A developed time-of-concentration route is approximated, since there are no specific development plans, and is fairly conservative in order to replicate a worst-case scenario. Infiltration calculations follow methodology presented in the Stormwater Management Manual for the Puget Sound Basin of the Washington State Department of Ecology (DOE). The retention pond is sized for the 100-Year, 24-Hour event, and shall retain the volume of this storm and infiltrate it within 48 hours. 3 `DELONG PARCEL,ADDMON Mlcros l F.Wnek,, P.E. PS Corbit Site,Mason County' Drainage ftort July 15,2002 Hydrographs from the developed basin (Delong) and the upstream basin (Basin-C) are added together to provide the hydrographs routed through the pond. No lag time is considered when adding the upstream basin to the project basin, for travel time through the project basin. Since the pond will not have an emergency overflow, the Corbit Site storm system will be extended to the pond to provide an outlet for severe conditions. Elevations of the storm sewer system are set so that the infiltration portion of the pond can not be bypassed (the pond must be above the 100-year design stage before overflow is possible). 6. Water Quality: Water quality will be provided by a bioswale upstream of the retention pond. Attached calculations show that a single 8-foot wide bioswale is inadequate to provide water quality treatment for the entire site, including the upstream basin. Phase III development will require additional water quality best management practices (BMP) depending on the type of development proposed. This may include constructing an additional bioswale, and splitting the flows to two separate bioswales, or constructing water quality features for each portion of the site as it develops. Notations are placed on the construction drawings to state that additional water quality controls measures are required for final site development. 7. Erosion Control: Temporary erosion control features are minimal as long as runoff is trapped from leaving the site. A silt fence is called for along the north property line within the fill area. A construction entrance will be required if the State highway is accessed directly from the project parcel. Notes are placed on the construction drawings to maintain drainage flow southerly into the site as the fill progresses, to minimize runoff leaving the site. Slopes shall be seeded to grass when completed. The retention pond will not be available to infiltrate runoff until the fill area is close to the design grades. DA209lstorm\DeLongStorte.doc 4 DFLONC PARCEL ADDITION Michael F. Wnek, P.E. PS Corbit Site, Mason County Drainage Report July 15,2002 Tab-2 Support Documentation TABLE OF CONTENTS EXHIBITS EXHIBIT DESCRIPTION PAGES A. USGS Map 1 page B. Isopluvial Maps 3 pages C. Soils Maps and Narratives 4 pages D. Hydrological Soil Group Curve Numbers 1 page E. Infiltration Rate Table I page (/ L „"' 4 73 /off -� 1 EXHIBIT A ' s Y r Y Y USGS Ma ,Y Y , Y Y o •X ,, Y r v0 J ■� � l • a rr l O 35H+ _ — r `r • -♦ � a ap I D �' I B a I O r_- y . 0 ♦ ► � e I _•r_ avet I fj5zr I � ♦y I a r ♦ i Gagin I i d Pit a s . r uZ0 © BM 33i 2 I Y Y 6 a2e i •# 0 a " I � ♦4 PROJECT LOCATION 7 Y �• t ,,•f ravel_ ---- ,--- I • — o •r 'b I •52x O I r `1 7 •O Y, r .L. � I •, I �' .y.. . M D o v I D a elfair' 34ex1 D r I O r EXHIBIT B Isopluvial Maps STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN 124 123 122 121 49 I _ 25 _ 25 ■ . • wr w sum a >D s n to L t. OILGA 70 FRIDAY HARBOR ✓ III\ t r• \ \ PORT STA LEY 30 N[r'4040 302520 15 10 R (j � I K� 48 t \ , ,{ \ ERETT n 45 a 1S — 5\ 15 c �_o,,:� uc 49 n�s i 31 ' 6 30 5 5 u e 1? t% II f 1 S AT I " ` N' 35 A-TCf'i 3 45 u I 40 20 35 55 3 \ 45 2 40 35 r COMA —�—� 47 .3 + Vs Irk ' !< AB ROE N �7 >e 30 , t 35 l� 15 25 40J CENT { �� -4920 r / YAKI 55. r 10 3 _ k �'' 20 _ w M s 45" ! 40 1 ' z :A Da 35— 1� 3 2 t tf�v u � r 4 6 (• ,f S5 45,An — — — -39 WASHINGTON 15 • B K r \ P.PL EN E 10 0 10 20 30 40 1 15 ' MILES 20 �'7n `' '"'-'� Figure 25 NOAA ATLAS 2, Volume IX Prepared by U.S.Department of C merce ISOPLUVIALS F 2•YR 24•HR PRECIPITATION IN National oceanic and Atmospheric ministration TENTHS OF A INCH National weather Service,Otfice of Hydrology Prepared for U.S.Department of A riculture, Soft Conservation Service,Engineer ng Division 124 123 122 121 III-1-44 FEBRUARY, 1992 J � X -TfTl T 17. Sol bill A � - 1 S 1 /\�r STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN 124 123 122 121 49 — _ �� 4 _ g0 ° 5 4L i 45.E i i s a_� ' 5 � 1 � v ° 40C r 1,A 4p�t 11 55 lr� rR;L-'f f1ARC 0 .PGRT S I A N L 70 �I 5 t t 0 r 0 5 80 3 1 6 0 t, 85 \ 30 \ 5 10 J 5 ip 25• 55 1 r� ` - 435��21 —,\ �.�� 3 O75'. AK,s 48 ,t 80 \ \ 45 5 90 85. 90\ 1 , 100V fu ys r p ~ 8o 5 Ns 10q L $ \ 40 s 90��- ^I AT 1 TIC 81 / t40 � 0 2 °° \\ 60't 00 6 4 55� 5 �;r;.: --j p ` 3 3� 47 r3 5 l' ABC C t, r� 2 � — 5 pis s TO 4 E tR L 0 C( 5 2 7S YAN ' 100 55 22° 1 6 1 1 45 5 ° ni 1 y tt 80 s f 55 651 7e T 0 5 0 � �1 AD Vic �30 25. 660 55� � ,N �0 1 8 \ 4 6 5 � � 5 WASHINGTON 4p i i°o ` EN .E t KEi 10 0 i0 20 30 40 MILES �n sssoe 35 — �reur 1 I NOAA ATLAS 2, Volume IX Figure 30 I 45 65 i prepared by U.S Department of Commerce 5055 60 (National Oceanic and Atmospheric Abminlatratlon ISOPILLIVIALS F 100-YR 24-HR PRECIPIT�TIONIN TENTHS OF N INCH National Weather Service,Oflice of Hydrolo6Y ! Prepared for U.S.Department of A*iculture, Soil Conservation Service,Engineering Division 124 123 122 121 III-1-46 FEBRUARY, 1992 !UMBER 4 EXHIBIT C Soils Maps and Narratives Ni. 1 W. ti•�:•' •x� .z''Pan, -�' ' T� :$ , V: '.TC lv. _ ;�f�•�r2y' y r •:`,+� •�.. •:y Agri �! 0� � o ;' ► r., :,,'�`' f ,� x� ¢ •' 2 Et : rj b.t:J•- '•.�•�'''.�F l.�i',jj tl' r•1.. k RD, r •f ,��.� .' Y�i' le`; �• E •A a� f•.:ti =� x fi,a• L:ram;, ..�,_=CY•^ li� •. it ! .; - �`• ;� '•./ 'r.' �• ,{ i• Y+ ,. i I .� •�:: it d_,.'.' •' .}•w �"+ t,�. ���. a[�f • 'J'/^,J,-j' �A�'l�!L,l� '•'Y �.:Ae44' r �1+• Q� yy' a',��+„t..L.RLl�''tl '� .q�.cr.r..� �� �•F-� j`R=�'•� ' f��t '] ` L i•• � '•� 1. � ¢ 4- +•.. •�,�•. is Vi Ll�:. J.�• � ,U�„�• -�;1:�4..,•.•1 tl:' [.,Jx, � i ♦ 1� A••'6�f•''• `a .. � _ - •' �atl. \•I f trll.�t t * . of + h 1 ;•)•: i'�k r•..af ice,• 'r � 1' •� r'i• •:( .� �.l••f./'S k.���r • t� � fl.� :,t N. p •�'C J / t•b=•'? :1!.� J� .�;. 1:r 6M ,. 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K `+ }`�, � 'Y,,j Afti' ..b.•> 7b Bit 8 •a °__ t. a ♦ ,' • .S- SOIL SURVEY SEIIIES 1051, A'0. 0 24 ' e Elcl sail Decals only in the extreme southern S all ill perial laces,l�cest]thislSnateriale�ylloosel ni11 porous. b:talcs. The\`color of tll county. It differs front the :1i:ti1y}ton It )? •of . + Itle avinb ti redder surfacotnC1l1eC`l ixlbyellowast;tiif ngtof contsessand and l cobblcs,y�vhiclt stare olive the r'. ,1). develope shot, and stro olive, yellowish brown, light brownish gr:t}y, Gray, and the subsoi . f tile co Eld silt l m, 0 to 3 percent slopes (Ee).--'this soil is di�i`cl rule faintly to moderate]y stained by as welfas iron.uch o file at the ]lead o }stcr IIa}�. The surface soil is reddish- g , )►ravel rang►es from about 20 Percent to brown, granule and friable silt loaan, 6 to IO inches The amount of g l thick, that contain a few very soft shot. This layer is 50 percent in the subsoil to as much as 80 percent in tllo underlain by a reek • ]t-b turet,is hit►Cla loallclth t has Substrbecom tum. acid s he oil is ls de�nedi m to strongly acid au<l a Subangular l�locky s tic , g Y ' art ' is and contains c nsiderab amounts a of•lsll]oyttni firsts depths moste tilled crops?�Iit dries s out before o cropsblmatu ety 1. Crois is ps— ranging from _0 to 32 it ) , Y111,111 IL layer of fairly compact, st Itifiecl sand and gi:lVnta�lcl O�lyaril` farmed along► itlt better adjacent soils.tlt`fost is pronlrnently stained by Iran. 12oulldecl ;facial , J• for mixed with subangalar basaltic gravel, is scattered oil of besthi Itos one in usi attertsoils for grow ing Do ialtas- the surface and through the soil. The soil is Medium acid throltnhol Surface drainage firs that are cut for Christmas trees. ' '1'ltis Is"all impor- is moderately well established tholigli :Mall wales may taut use of the soil; ]ai;ge acreages are use•,] for Clui�t stay ��et for a long time. SltjPsnif:lce. c linatre is fairly mas trees. slow because of :L s]ow1� receding, fair high water This soil is in capability subclass VIs :uxl in site table. class 4 for Douglas-fir. . nravell sand loam, 0 to 5 percent slopes L',�c mild slrtti�LalitJ.—Most. of the soil i u. for Everette Y Y 11P.istarc. or main. 1[ana�►Cltlent is similar to h:lt of (Eg},--'Phis soil oceu Pies the smoother out��ash terraces it 11Ia�•towil silt loam, 0 to 3 percent slopes, but vie s nre associatiol1i Sandy loanther et.I to soils.15 ]�c percentSlopes,iffers Ioir sli_htiv lower. Everett ggravelly Is -erierally 2 to 3 inches thicker '1'11is sot] is in capability subclass a it is good sl r (1�etprcSilileiisa]e s ay l�; and the substratum, or lulder ling material, is usual])' more stratified. svcR1TT SERIFS Usc nn�l suita$ilrr'i�.—lhst;i t` o�y�i»s G�ItoSI ,llperec�nilar t I'lie F,rcrctt series consists of sonleNvIlat exccSsiVc)�' that of I?verett ar:ivelly , drained, pale-brown gravelly soils. They occur as mex- slopes. The soil is in fires anct 1.Irnsh, except for a fev ►rowing► of Danglas-fir fo tensive !,ravel ridges on the gl:lcial moraines, or, morn small cleared :►reaor y;lillh�gilt impoltanre. 'This soil is ii commonly, as fairly coil tillllous 011twaSlt channels be- Christmas trees is t« Ir •ecll ric'lges of .Uclerwood Soils. Tl,ev have d�l.e]oT�,c sitEyerett e class 4 fra�elly sanfdy loam, 151to�30tpercent slope: upon assorted glacial till and outll a..[I mated rainfall is �:°, to G0 inclles a Ve:u•. The Vegetation is (Ek).—'This soil is on the steeper slopes of glacial mor.lines mainly drought-resistant mndrone, manzallita, and lain- sides of ;;allies and terrace (rants. 7t is closely nsso nikinnicic. ciated with otiler I:vcrett soils and the .Aicterwo0� Everett soils are droughty because the loose gravel and gi•avel)y Sandy l0anls. gravelly sand sanely subsoil and substratum offer little resistance to This loll is more varlit iable than Everett dowl'ward movement of water. The capacity of the sar ionlmesSfmmJ1�� toe3G inches as. nd the lammmttoft7rayc face soil to hold available moisture is low. � greatly from Pl lc I;Vrirtt soils are in the eastern half of the county, ill in teY also Occur1iheto surface Soil and subsoil Varies 1 associat ion with the ��lclerwoacl sot'nnd1Inctiattola soils. A.1derwood,soils, the substratum, ill 1liere file soil is ill close t places,0is rompa]c in intricate patterns with the hits 1 Compared to the Grove soils, the Everett soils have a and wealcly cemented. paler surface soil and subsoil and, in development, were Included are a few areas baving slopes sli�litly `�reatc dominated more by 'Ieid igneous parent rock. than 30 percent. soil is suitable only fr Everett gravelly sandy loam, 5 to 15 percent slopes Use and su•i1.uLilse it s MroT]lis (Eh).—This is the "lost extensive Everett soil;l iIh bro�Il f�Ifel(iliheCalIt is in cap'.Xility sabrLiSs`\Ist.i 1 tin l�' turbed forests I to 2 inches of Vey} dark g y )' material a mixture of needles, leaves, twigs, cones, moss, class 5 for Douglas-fir' and roots, covets the surface. +raThe e]] ySsaIdy loan,, 0 to 8 (Ed).ace soil is loose, `—e'I'lt s s ilgrarett , �roccellypies rite smoother terraces ortout� s single-grained, pale-brown, g ) - , inches thick. The upper 2 or 3 inches normal]`y contains plains in close association with other ]�.Vcrett. Sol s. a,gregatcs that are slightly hard and redder' than the differs from Everett gravelly s:Italy loam, 5 to l� percei others In the later. To depths ranging fronn 1S to 24 slopes, in haVifig a finer surface soil and n S1►nitt. inches, the subsoil is loose, sin -C sill gle-grained, liglit yellow- coarser subsoil. ish-brown gravelly sandy loam or gravelly 10-111 y sand. Use on�l sK�itubihfJ ra elly Sandyllonnii,t5lto 13 peree The amount of shot decreases with depth; in the lower to those for,Everett part only a few shot occur. slopes. This soil is poorer for forest than t is P• l gravelly sandy loam 0 to 5 Percent slopes. It is The subsoil grades to a substratum of Pooch assorted, gravelly 1 predominantly yellowish-brown sand, gravel, and cobbl ' capability subclass�'Is and in site class ., for Douglas-f I • MASON COUNTY, WASIAII;GTON 25 gravelly loamy sand. The subsoil is a li�,ht•b•o*,,'n, 1'erJ b Everett gravelly loamy sand, 5 to 15 percent slopes r ned u1d contains no shot. At It is ,� grades (Ee).—"!'his soil is similar to EN-CUtt t its profile is mo le 10,1111Yrileaancl depths st l tun iof loo4 ;rates,cobbles,and sand. The 0 to 5 percent slopes, b p «i•;1 ish bro��n,yellowish brown, the thicknesses of t]1c surface soil and subsoil are slightly clomin alitcolors are brat, y �rzvel is hi�rlll stained less. and light brown. Much of the b . y t use ti for Christmas trees. '!'his ��itli nearly black and rec dish-brown nlateria Ili places Use and s-tritu.bility,—Practically all of this soil pis in thou>>cl `'�inches of the ubstratum is compact or�t•calcly trees aril brush. Its bes soil is in capability subclass \GIs and in site class ,i for celnente(1• Douglas-fir. II1Clil(1eol N%.itll this soi are about 250 acres occurring E�'erett gravelly loamy sand, 15 to 30 percept slopes �►llid slo•tinry fans, co]lu�•ial slopes, and terraces. 1 to The Arent m:lteM.al of Ile included soils is a, mixture (EQ.�I,xcloatlfQ1sale},e `lois15soPercent1slopes. Profile on bl• y gravellJ yvar ^restly from place to pace, espe- of local basic i�tleous r cl: Imes nGro ,ra ellylsandy characteristics y 5 The profile is slnlilar t that of Grove cially op the steeper slopes. loam, 0 to 5 plercent slops, but it differs In bein;; bro��n Uae a�ld slfi.taLility.-.L11 of this soil is in trees and ,and ello��•ish brown n re 1•ariable in tcature :u1d in subclass \GIs. degree of stratification, : nd in containing nlnrh :ulgular brush, and its best use is forestry. It is in site class 5 J Rr11 el. for Douglas-fir and in capabilitJ alxl silbanmilar . This sc►il is strongly, to niedium acid and less acid with '• :uieous Iflll(1 t� to consists of open flits froill depth. Surface runotT 1. very slow because of the rapid y. 11n�miscell lermeaby of the soil Ind the smooth topography• Nrhicll the soil and unclerl: g material lain been are 1 Ga. Pits in fat"lls ptodncatlg mail ly fur theit is best►Isuited.� Be- tcd. The pits arc about 1 to t acres in sire and ore Use cr,id. srril(rl,ilit�.-1 xccfoiq)t for f l ery sill. Icrcag shown on the soil ninp by Ile letter s`1111�01 it is nut suitable smaller than 1 acre are shotl'I on tliOsolls of 'Il by e Everett.' (�uscSOfldroll htinelssc 11 11o�111fcrti]itJ, s�•Illbols, Most orayel pits a,1 e�i1i the L'rerett gt•aleli�, sap]y loam, 0 to 5 percent slopes. GI o�e and C:u st:urs scric . Tile exca�atcd brardl�� fur hay or pasture. L1 . titaball),, this --oil iDOlit^l:SL fi o material his been used main y- for road Construct loll. except that. It is In cl: S es 3 and � GROVE SERIES 1l7artiv bec:nise of Ille hi her rainfall. .�rcas in �'uun cries corlsis s of somelt],at excessively llon�las-�1bi1 t1• �►tlxl ss for Is.�`hrist,nas trcc�s. The Sol. The Gred S .ri'a ells, soils. It occupies the is in cal , drained, reddish-bro�rn b ,. sand loam, :i to 15 percent slopes large glacial uuttt•nsh 1,Lun, the Grove soils lulre d�- Grove ,l►cc51t11e surf., e soil and subsoil of this coil ;u, lclupccl from \':Ishon `rlacia drift, nlodilicil considerably IGkI•— l by inchlsiuns of local basaltic rocl: :1t1� nlixllc material lottmG011tolt3 percent s;lopsllo_e of Grote gr:llcllJ s:uu : t. fi•0111 the Olrillpic Mount• in friaclet.. '.1 tin:lted b , the that of Grove -r:llc�ly sa my loans, 0 to 5 per slopes r:ul.ms ft<un GO to 100 !oche ;t ye:lr. The vegetation is T7se m,(I ,,cihrLilitl�.—l.he use of this soil is Similar coniferous forest, with an a ldcrstory don 1n�1 , Coniferous bus �on mosses, 1(iuni;innick, all snowberrl•, . Like that soil it is bests itch to forestry. The soil is r. these Mixed 1t'ith huc1;]eber �, sa1:11, and Oregon grape• callabilitJ subclass VIs; t is in site Classes 4 and 5 fo '1.11c drought resist:ult, man' uiita is cspecia}]y common Don�las-fir. on the Grope soils. The co •er is not. so profne nor �o Grope gravelly sanely loam, l to 30 percent slope rank as that on the atljac lit She)ton and Iluc►dsport (Gml•--'.His soil occupies he slopes bordering on crr:u sc,ils. Lo�sgril ►teas .— re- slo%\ to Douglas sir, and flouts. *rat ell , sand some pug(: st:ulcls; of lodgepcle pill(', :Ire on iliese sods:. i'I,e prokle is similar t Ihat of Grote „ J The Gro�c soils occur i the �sestein ,art of the loam, 0 to .5 percent slo es, except that deptlls to t colulty, in association 'with he Slielt`CrettlCtoils farkler aches,rt gravel :uThe talund of ntlof le S r ravel tin11tilell of le ge gal;S v:16 soils. Grove soils differ frc n isle I. from glace to 1 ace. Surface rm1u1Y is No east in their parent, Inateria ages in hating redder sllr- i�Rp��span fionl Gro1 e 5 'Is 11a1•illa slopes of less the face soil a,,d subsoil. Grove gravelly sandy I m, 0 to 5 percent slopes l;i perccllt. is of forest because of its slut �b drought stibeiasss,�Is mil in f s(G Grove This soil occupies Ile"' ly level outwash Plains. Use crud. slritcfLihtJ.= his soil htUl sl\able olow n y Ili forested arcas there s a 1- to inch l is Ill Cap iver needles, le:l\•es, twig`s, roots, and moss. -Ths ish bro rolower t class 4 forlDonl las-fir. b1htJ su 15 111Odei'atel)' decomposed al d 1 erg' doll. o Grope gravelly sandy oam, 30 to a5 percent slut The slu f;lcc soil consists of reddish bro�t n, :;rnrelly \lost of this soil oc urs on short•, steep slopes a sant}y ]o:un, G inches thick. It is rery friable, is single (Gal,—_ -1 e l sand , loom, 15 to 30 p ^•rained,;uul COtlt,lins a few sI loll,round shot. The uhloio oliITe sbfronlrli e Gro�e(lg -av valleys r teiI�c1dd oion, part of this layer contains t fear firm, irregalar, m reddish a;rren:lte.s. Tile n xt layer 1e to ds to tl e drfa]ce dPl 11nt SSO10 tI►o g1tibstrat unlpes, ill slopesl l�llo C ltl 11ort distances fr ranging from l2 to 1.4 inches It is Si ace soil :utd subsoil no nlnlly contain 50 percent that it]S Illol'C gr:1 elly,contains less shut.,and lfcss th:ln 12 inches to as much ns Contain incllcs, Tile c soil,except the ;ravel is stained and co:l d with dark reddish more of gral't'T• fine material. a-" '1'Al:t.l; 4.--Imporlun1 ch rucicriNtiec of soits of Rlasolb Courdy, plash.--Continue N AaLurul (h ccurn Weis i\loi cturu- 1tuoL De►Llt to Inycr Natural Speci:+ manuproblems n+ent . Soil dr:►inag,: of high sal>ph•ing 1x nct.rnLiat, L�tat limits = fertiliobl ty water table c:►p:►cit} � )united by— root penctr:►Lion ____ Low______. Cu:trsc: gravel. Moderately Low._----- Low fertility and Lrcrcl•t gravelly sand} loam, 5 to 15 Somewhat None-------- dccp droughtiness. Percent avell . excessive. Low.__--_. Low fert.ihty, Everett dopey sandy loam, 0 l0 5 Sou►e►rlt;tt \one-____.__ I.O++-____--- Coarse gravel_ Moderately droughtiness, and ,percent slupcs. excessive. steep slopes. I.o+r-- ---- J.ou fertility, L+•eteiL gravelly sandy loan►, 15 to 30 Somewhat None-------- Lo+r------- C0.trsc gravel i\IdecpatCly droughtiness, and percent slopes. excessive. steep slopes. Lo++•_-___-_ J.ow fertility and 1•;vcrett gravelly lo:uuy sand, 0 to 5 Soo►ewhaL None-------- Low•------- Coame gravel_ ;1[deC`atCly drough.tiness.I percenL slopes. excc`�ivc. (loci). drougl:t,iness. 1:+•crctt gr:►reily lo:uny sand, 5 to l:i Sumcw•lu►t None-------- J•u+r------- Coarse gra+-cl_ \fodcralcl}• LOW------- T,ow• fcrt.t ,ty and percent•slope exec�5►ve. Everett gravelly loauty sand, 15 to 30 �outcw-hat Nouc___----- Low------- Coarse gravel_ Moderately l} Low------- I"droughtiness, and deep. steep slopes. percent slopes. excessive. deep. droughtiness. o Grove gravelly sandy lo:un, 0 to 5 per- Somc++•ptap; None________ Lo++'__----- Crn•cl_______ �Ialcratch• Low-------____-- Low• fcrt.ihty an cent slopes. excessive. Grove gravelly sandy loam, 5 to 15 Soutbwlu►t Nonc______-- Lou-------- Gravel------- �IdeeratclY LOi+'------- holroughtiuc s11 r • sleep. � perccut slupcs. excessive. rove gravelly .andy loam, l5 to 30 Sonucagt;►t Nunu.._.._-- T.ow_-•-•- (:r►vcl------- \ldreptLcly Low------- T� clroughtimss, :uid C perccnL slopes. excu"ivc. steel)slopes. ly Low Low fertility, .4 Grove gravelly sandy Wall', 30 to •15 SoutC+rhat None-------- Low------- G ravel------- �fddc`1ep. droughtiness, and &n percent slopes. cxccxsive. sleep slopes. t_y elects. droughtiness. En Grove cobbly s:uxl} loan►, 0 to 5 per- Some►ch:+p Nunr.--_--_-- J.ow_---_-- Gra+cl_____-- Moderateh Low'-_----- Low fertility and M cent slupcs. execs cce. .tnd Grove cobbly sandy loans, 5 to 15 per- Somewhat i\`u:u�.____.._ T.ow.__-_-. Gravel__-- �Icdee�atcl}" IO+v------- L drougl►ti ess. *... to cent slopes. excessive. CA Grove cobbly sandy lu:+n►, 15 to 30 per- Somewhat ex- Noue........ J.ow------- Gravel------- �Ideep+t.cly Low-._---- J' droug11 fertilitness�d Cent slob. civc. deep. drought.incss. Z Grove stony sandy loam,0 to 5 percent Soanew-hat ex- None-------- T,ow_____-- Cravcl_--__-- �IudcraLcly T.ow___ -- Lou fort: etc an slupx:s. ccssivc. deep. droughtiness. Groru gravelly loam, 0 to 5 parceut Sumcw-hak cx- \one_____--- T,uw_____-- Gravel_____-. �Iodcratepy Lour_____-- Low•fort., ► y an � Slopes. cessive. deep. droup;hLincss. C�ro+•c gravelly loam, 5 to 15 px:rccn6 San+c++•lu►p,cx- Nunc___----- Lu++-------- Gra+•cl------- 1\Iodcraprh• Low-_--_-- Lou• fcrt.i ,Lyanc slopxa. Ccs�i+c. dccp. droughtiness. Grocc gr:►rellc loam, basic phase, 0 to Good---------- Occa�iuualp} F:►ir___ Gravel i\lodcr:+tcl} Low------- Low fertility an 5 percent slopes. in winter. Grove Kra+clly ranch loan►,basin pliase, Good---------- OWLsionallr hair---_--- Gravel-___--- Dldeep. cl} Low-__---- Lowdroughtiness.d in winter. dccp. 0 to 5 perccnL slop)CF. droughtiness. Iiarst.inu gravelly sandy lo:tm, 5 to l5 Good___------- Nuuc____---- fair-_-_--- Compact Lill_- \Ideep►tch Low.-_---- J.o�r fertility an percent slopes. Cum tct till__ Moderately Low_.-_--- Lou- fertility, droughti- ]I:►rstiuC gravelly ranch loam, 15 t.o",0 Good-__-_.---- Nonc___ J.ow___.__ 1 deep. nc�x,andstcepslopcs. percent slopes. droughtiness. 1[uudsporL p,r:►vc11y sandy loam,5 to 15 Good---------- i�u:cc------• hair to low-_ Compact till__ �Idccp+tel}• \'cr}• low___ Low fertility au px rca,t slopes. deep. droughtiness. lIoodspurt gravelly s:u:dy lo;un, 0 to 5 Good---------- Nonc_______. Fair to low'_ Compact till_. ?�iodcr:+tcly \'cry lou___ Low tert.iliLy an percent dopes. lloud�port gravcllc sandy loam, 15 to Good---------- Nunc__-•__-- 1,0++__--_-- Compact till_- 'Moderately Very low_-- Low cssfertility and��dpesu6+ti- 30 px:rccnt slopxw. very low--- Low' fertility droughti- Iluodsp ors gravelly sand}• loam, :,0 to Good---------- No„e-------- LOW.___--- Compact till.. i\loderatcly }' ness, and slopes. deep. d5 pxrccntslopes. 1[o5 purct sl•onv sandy loam, 5 to 15 Guod________-- No11e-------- hair to low_ Compact till__ \p ce�alely \rery low'_-- LOle&5, and slopes. ttc- per«:nt.slopes. Norio____- T,o++• ______ Cou+p:►c6 t111-_ Modcratc1% Von low___ Low fertility droughti- 1[oodsport stony sandy loam, 15 to 30 Ctout,...._.---- dccp ncss, and slopes. percent Slopes. p---------- Low------- Low- fertility. silt loam. 5 to 15 percent Good______-_-- Nunc________ ]ligh_____-_ Compact till Dee EXHIBIT D jlydrologkal Soil Group Curve Numbers STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN Table III-1.3 SCS Western Washington Runoff Curve Numbers (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type IA rainfall distribution, 24-hour storm duration. LAND USE DESCRIPTION CURVE NUMBERS BY HYDROLOGIC SOIL GROUP A B C D Cultivated land(1) : winter condition 86 91 94 95 Mountain open areas: low growing brush & grasslands 74 82 89 92 Meadow or pasture: 65 78 85 69 Wood or forest land: undisturbed 42 64 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover crop 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. Good condition: grass cover on t75$ of the 68 80 86 90 area Fair condition: grass cover on 50-75% of 77 85 90 92 the area Gravel roads & parking lots: 76 85 B9 91 Dirt roads & parking lots: 72 82 87 89 Impervious surfaces, pavement, roofs etc. 98 98 98 98 open water bodies: lakes, wetlands, ponds etc. 100 100 100 100 Single family residential(2) : Dwelling Unit/Gross Acre %Impervious(3) Separate curve number 1.0 DU/GA 15 shall be selected for 1. 5 DU/GA 20 pervious & impervious 2.0 DU/GA 25 portions of the site 2.5 DU/GA 30 or basin 3.0 DU/GA 34 3. 5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50 6.0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA 56 PUD's, condos, apartments, %impervious commercial businesses & must be industrial areas computed (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Sec. 4, Hydrology, Chapter 9, August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. III-1-12 FEBRUARY, 1992 EXHIBIT E Infiltration Rate Table STORMWATER MANAGEMENT MANUAL FOR-1—T— —vi— Table III-3.1 Soil Properties Classified by Soil Texture a 2 0 < < < m m U U 1Q a A A A r'o x � _T w w Y1 T i� rt V gj O O u C O O O O O O O O O G 3 O h h H h r r H vl Y� ✓1 O� li LaT " V V �+ n n n n n n n n . n O U .J g C d O O 4 � r u H T .0 C w W � C u w C C Y 9 y t E •L N v o r � s x ` r o. 04 � 4 ■ u .0 7 U M Y � C _T � •u w n u Y � U ^ � U U v H F- o � v� rn E U U U U N U III-3-8 FEBRUARY, 1992 DE-LONG PARCEL ADDITION Michael F. Wnek P.E. PS Corbit Site,Mason County Drainage Report July 15,2002 Tab-3 , . Retention Pond �, ngineering Calculations TABLE OF CONTENTS Pages BASIN PLAN DELONG PARCEL....................................................................................... 1 Hydrology Calculations.......................................................................................... 5 Infiltration Pond Calculation.................................................................................................. 1 Bioswale6-Month.......................................................................................... 1 Bioswale100-Year................................................................................................................. 1 -- --------- _--------------J/ I � M KATCFJEP"K-LA BASIN-C IMPERVIOUS AREA = 0.44 ACRE '_ T.O. CONCENTRATION: 1,250' A 1% ri ` BI06MME OF 1 � O oo Q� r, 4b �•. } \ i'� r 'f t ' i At; `X. air _._ %�// ;; f /•� oo�t' ��` PGe' FUTURE STORM RIM.�+96.00t 1i; y� ���•..�_. �l o t W IE: 89.6 . F � ..... �f r' - _ % �� p 40 rl► z 5 �gi AREA T.O.0 z� ��! C3 oT h HYDROLOGY CALCULATIONS CORBIT SITE / DELONG PARCEL ADDITION Project Precips [2 yr] 3.50 in [5 yr] 0.00 in [10 yr] 4.80 in [25 yr] 0.00 in [100 yr] 6.80 in [6 mo] 2.35 in BASIN LIST BasinlD Peak Q Peak T Peak Vol Area Method Raintype Event ------- (cfs) (hrs) (ac-ft) ac /Loss DELONG 3.6303 8.00 1.2953 9.30 SBUH/SCS TYPEIA 6 mo DELONG 5.7327 8.00 2.0722 9.30 SBUHiSCS TYPEIA 2 yr DELONG 8.2622 8.00 2.9882 9.30 SBUH/SCS TYPEIA 10 yr DELONG 12.2933 8.00 4.4413 9.30 SBUH/SCS TYPEIA 100 yr BASIN-C 0.2117 8.00 0.0957 4.20 SBUH/SCS TYPEIA 6 mo BASIN-C 0.3219 8.00 0.2281 4.20 SBUH/SCS TYPEIA 2 yr BASIN-C 0.4704 8.00 0.4437 4.20 SBUH/SCS TYPEIA 10 yr BASIN-C 0.8886 8.00 0.8665 4.20 SBUH/SCS TYPEIA 100 yr HYDROGRAPH LIST HydID Peak Q Peak T Peak Vol Cont Area ------- (cfs) (hrs) (ac-ft) (ac) BASIN-C+DELONG-0006 3.84 8.00 1.3910 13.5000 BASIN-C+ DELONG-002 6.05 8.00 2.3003 13.5000 BASIN-C+ DELONG-010 8.73 8.00 3.4319 13.5000 BASIN-C+ DELONG-100 13.18 8.00 5.3078 13.5000 BASIN DATA Drainage Area: DELONG Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 2.3300 ac 68.00 0.22 hrs Impervious 6.9700 ac 98.00 0.11 hrs Total 9.3000 ac Supporting Data: Pervious CN Data: Lawn & Landscape (25%) 68.00 2.3300 ac Impervious CN Data: Roof& Pavement 98.00 6.9700 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet Lawn / Landscape 75.00 ft 0.50% 0.1500 12.96 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet Pavement 75.00 ft 0.50% 0.0110 1.60 min Shallow Gutter Flow 200.00 ft 4.00% 27.0000 0.62 min Channel Storm Pipe 400.00 ft 0.50% 21.0000 4.49 min Drainage Area: BASIN-C Hyd Method: SBUH Hyd Loss Method. SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 3.7600 ac 55.00 1.75 hrs Impervious 0.4400 ac 98.00 0.20 hrs Total 4.2000 ac Supporting Data: Pervious CN Data: Forest, Young 2nd Growth 55.00 3.7600 ac Impervious CN Data: SR-3 98.00 0.4400 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet Forest w/ Underbrush 300.00 ft 1.50% 0.8000 96.59 min Shallow Forest w/ Underbrush 275.00 ft 3.50% 3.0000 8.17 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Channel None Entered 1250.00 ft 1.00% 17.0000 12.25 min a STORAGE DATA Node ID: CALC-POND Desc: Retention Pond Storage by Contour Area Start El: 87.0000 ft Max El: 96.0000 ft Contrib Basin: Contrib Hyd: Stage Area Volume Volume 87.00 6471.00 0.00 cf 0.0000 acft 88.00 8379.00 7425.00 cf 0.1705 acft 90.00 12543.00 28347.00 cf 0.6508 acft 92.00 17171.00 58061.00 cf 1.3329 acft 94.00 22262.00 97494.00 cf 2.2382 acft 96.00 27818.00 147574.00 cf 3.3878 acft Stage-Storge Table for node CALC-POND Stage Vol Vol Stage Vol Vol (ft) (cf) (ac-ft) (ft) (cf) (ac-ft) 87.00 0.00 0.0000 91.60 52118.20 1.1965 87.10 742.50 0.0170 91.70 53603.90 1.2306 87.20 1485.00 0.0341 91.80 55089.60 1.2647 87.30 2227.50 0.0511 91.90 56575.30 1.2988 87.40 2970.00 0.0682 92.00 58061.00 1.3329 87.50 3712.50 0.0852 92.10 60032.65 1.3782 87.60 4455.00 0.1023 92.20 62004.30 1.4234 87.70 5197.50 0.1193 92.30 63975.95 1.4687 87.80 5940.00 0.1364 92.40 65947.60 1.5139 87.90 6682.50 0.1534 92.50 67919.25 1.5592 88.00 7425.00 0.1705 92.60 69890.90 1.6045 88.10 8471.10 0.1945 92.70 71862.55 1.6497 88.20 9517.20 0.2185 92.80 73834.20 1.6950 88.30 10563.30 0.2425 92.90 75805.85 1.7403 88.40 11609.40 0.2665 93.00 77777.50 1.7855 88.50 12655.50 0.2905 93.10 79749.15 1.8308 88.60 13701.60 0.3145 93.20 81720.80 1.8761 88.70 14747.70 0.3386 93.30 83692.45 1.9213 88.80 15793.80 0.3626 93.40 85664.10 1.9666 88.90 16839.90 0.3866 93.50 87635.75 2.0118 89.00 17886.00 0.4106 93.60 89607.40 2.0571 89.10 18932.10 0.4346 93.70 91579.05 2.1024 89.20 19978.20 0.4586 93.80 93550.70 2.1476 89.30 21024.30 0.4827 93.90 95522.35 2.1929 89.40 22070.40 0.5067 94.00 97494.00 2.2382 89.50 23116.50 0.5307 94.10 99998.00 2.2956 89.60 24162.60 0.5547 94.20 102502.00 2.3531 89.70 25208.70 0.5787 94.30 105006.00 2.4106 89.80 26254.80 0.6027 94.40 107510.00 2.4681 89.90 27300.90 0.6267 94.50 110014.00 2.5256 90.00 28347.00 0.6508 94.60 112518.00 2.5831 90.10 29832.70 0.6849 94.70 115022.00 2.6405 90.20 31318.40 0.7190 94.80 117526.00 2.6980 90.30 32804.10 0.7531 94.90 120030.00 2.7555 90.40 34289.80 0.7872 95.00 122534.00 2.8130 90.50 35775.50 0.8213 95.10 125038.00 2.8705 90.60 37261.20 0.8554 95.20 127542.00 2.9280 90.70 38746.90 0.8895 95.30 130046.00 2.9854 90.80 40232.60 0.9236 95.40 132550.00 3.0429 90.90 41718.30 0.9577 95.50 135054.00 3.1004 91.00 43204.00 0.9918 95.60 137558.00 3.1579 91.10 44689.70 1.0259 95.70 140062.00 3.2154 91.20 46175.40 1.0600 95.80 142566.00 3.2729 91.30 47661.10 1.0941 95.90 145070.00 3.3303 91.40 49146.80 1.1283 96.00 147574.00 3.3878 91.50 50632.50 1.1624 96.00 147574.00 3.3878 DISCHARGE DATA Control Structure ID: INFIL-CALC - Stage Discharge rating curve Descrip: Retention Pond by Pond Contours Start El Max El Increment 87.0000 ft 96.0000 ft 0.10 Stage Discharge 87.0000 ft 1.2390 cfs 88.0000 ft 1.7640 cfs 90.0000 ft 3.1220 cfs 92.0000 ft 4.9310 cfs 94.0000 ft 7.2450 cfs 96.0000 ft 10.1180 cfs LEVEL POOL ROUTING DATA RLPCOMPUTE [RLPOOL-CALC] SUMMARY 2 yr MatchQ=PeakQ= 6.0546 cfs Peak Out Q: 2.0959 cfs- Peak Stg: 88.49 ft-Active Vol: 0.2879 acft 10 yr MatchQ=PeakQ= 8.7326 cfs Peak Out Q: 2.8019 cfs - Peak Stg: 89.53 ft-Active Vol: 0.5376 acft 100 yr MatchQ=PeakQ= 13.1819 cfs Peak Out Q: 4.0459 cfs- Peak Stg: 91.02 ft-Active Vol: 0.9991 acft Hydrograph ID: 100-CALC (Pond Infiltration) Area: 13.5000 ac Hyd Int: 10.00 min Base Flow: Peak Flow: 4.0459 cfs Peak Time: 9.67 hrs Hyd Vol: 5.3121 acft Time Flow Time Flow Time Flow hr cfs hr cfs hr cfs 0.67 0.2803 13.33 3.4965 25.83 1.4546 0.83 0.3545 13.50 3.4675 26.00 1.3994 1.00 0.6192 13.67 3.4387 26.17 1.3460 1.17 0.6700 13.83 3.4090 26.33 1.2944 1.33 0.9452 14.00 3.3791 26.50 1.2445 1.50 0.9232 14.17 3.3499 26.67 0.0000 1.67 1.1417 14.33 3.3218 26.83 0.1555 1.83 1.1199 14.50 3.2946 27.00 0.0000 2.00 1.2401 14.67 3.2676 27.17 0.1285 2.17 1.2413 14.83 3.2395 27.33 0.0000 2.33 1.2456 15.00 3.2112 27.50 0.1061 2.50 1.2520 15.17 3.1835 27.67 0.0000 2.67 1.2594 15.33 3.1568 27.83 0.0877 2.83 1.2675 15.50 3.1310 28.00 0.0000 3.00 1.2759 15.67 3.1041 28.17 0.0724 3.17 1.2848 15.83 3.0755 28.33 0.0000 3.33 1.2937 16.00 3.0467 28.50 0.0598 3.50 1.3028 16.17 3.0186 28.67 0.0000 3.67 1.3128 16.33 2.9915 28.83 0.0494 3.83 1.3245 16.50 2.9654 29.00 0.0000 4.00 1.3372 16.67 2.9402 29.17 0.0408 4.17 1.3515 16.83 2.9160 29.33 0.0000 4.33 1.3692 17.00 2.8928 29.50 0.0337 4.50 1.3888 17.17 2.8694 29.67 0.0000 4.67 1.4099 17.33 2.8449 29.83 0.0279 4.83 1.4342 17.50 2.8199 30.00 0.0000 5.00 1.4603 17.67 2.7955 30.17 0.0230 5.17 1.4881 17.83 2.7719 30.33 0.0000 5.33 1.5193 18.00 2.7492 30.50 0.0190 5.50 1.5523 18.17 2.7264 30.67 0.0000 5.67 1.5869 18.33 2.7022 30.83 0.0157 5.83 1.6247 18.50 2.6776 31.00 0.0000 6.00 1.6642 18.67 2.6535 31.17 0.0130 6.17 1.7068 18.83 2.6302 31.33 0.0000 6.33 1.7564 19.00 2.6077 31.50 0.0107 6.50 1.8060 19.17 2.5850 31.67 0.0000 6.67 1.8599 19.33 2.5610 31.83 0.0089 6.83 1.9238 19.50 2.5365 32.00 0.0000 7.00 1.9933 19.67 2.5124 32.17 0.0073 7.17 2.0686 19.83 2.4892 32.33 0.0000 7.33 2.1559 20.00 2.4667 32.50 0.0060 7.50 2.2499 20.17 2.4449 32.67 0.0000 7.67 2.4081 20.33 2.4240 32.83 0.0050 7.83 2.7041 20.50 2.4038 33.00 0.0000 8.00 3.0857 20.67 2.3844 33.17 0.0041 8.17 3.4066 20.83 2.3657 33.33 0.0000 8.33 3.6142 21.00 2.3477 33.50 0.0034 8.50 3.7486 21.17 2.3303 33.67 0.0000 8.67 3.8548 21.33 2.3137 33.83 0.0028 8.83 3.9278 21.50 2.2976 34.00 0.0000 9.00 3.9805 21.67 2.2822 34.17 0.0023 9.17 4.0198 21.83 2.2673 34.33 0.0000 9.33 4.0386 22.00 2.2531 34.50 0.0019 9.50 4.0448 22.17 2.2384 34.67 0.0000 9.67 4.0459 22.33 2.2222 34.83 0.0016 9.83 4.0409 22.50 2.2052 35.00 0.0000 10.00 4.0324 22.67 2.1884 35.17 0.0013 10.17 4.0210 22.83 2.1721 35.33 0.0000 10.33 4.0044 23.00 2.1563 35.50 0.0011 10.50 3.9846 23.17 2.1412 35.67 0.0000 10.67 3.9631 23.33 2.1265 35.83 0.0000 10.83 3.9384 23.50 2.1124 36.00 0.0017 11.00 3.9121 23.67 2.0988 36.17 0.0000 11.17 3.8853 23.83 2.0857 36.33 0.0000 11.33 3.8575 24.00 2.0731 36.50 0.0013 j 11.50 3.8294 24.17 2.0503 36.67 0.0000 11.67 3.8011 24.33 2.0045 36.83 0.0000 11.83 3.7718 24.50 1.9442 37.00 0.0000 12.00 3.7424 24.67 1.8817 37.17 0.0014 12.17 3.7129 24.83 1.8198 37.33 0.0000 12.33 3.6824 25.00 1.7586 37.50 0.0000 12.50 3.6517 25.17 1.6941 37.67 0.0000 12.67 3.6210 25.33 1.6314 37.83 0.0000 12.83 3.5893 25.50 1.5706 38.00 0.0012 13.00 3.5574 25.67 1.5117 38.17 0.0000 13.17 3.5264 25.83 1.4546 38.33 0.0000 Pond empties with 38.33 hours I � DeLONG-pond.xls/ INFILTRATION POND-1 PROJECT: CORBIT SITE FILE. D:I CIVILENG12091 STORMI DeLONG-POND.XLS DEPT. OF ECOLGY, STORMWATER MGT. MANUAL - PUGET SOUND REGION SECTION III-3.4 INFILTRATION POND CALCULATION VARIABLES: Sand USDA SOIL CLASSIFICATION 7.26 min/inch (F) PERMEABILITY RATE 8.27 inch/hour 1 (d) PERC RATE SAFETY FACTOR ("2" RECOMMENDED) 8.0 ft (h) MAX. HEIGHT OF STANDING WATER IN FACILITY loft (L) BOTTOM OF INFILTRATION TRENCH TO WATER TABLE/BEDROCK CALCULATED INFILTRATION FLOW: 0.69 ft/hour (Fd) PERC RATE (CONVERTED TO FEET PER HOUR) AND ADJUSTED BY SAFETY FACTOR FORMULA: Q = Fd ` i 'A where - i = (h+L)/L A =w*Y STAGE STORAGE AND DISCHARGE POND POND POND h i AREA Q ELEV VOLUME VOLUME (ft) (ft/ft) (sf) (cfs) (ft) (cf) (acre-ft) 0.0 1.0 6471 1.239 87.00 0 0.00 1.0 1.1 8379 1.764 88.00 7425 0.17 3.0 1.3 12543 3.122 90.00 28347 0.65 5.0 1.5 17171 4.931 92.00 58061 1.33 7.0 1.7 22262 7.245 94.00 97494 2.24 9.0 1.9 27818 10.118 96.00 147574 3.39 Page 1 CoF-3(T SVTE- r D �oNG PAZCE-L TRAPEZOIDAL CHANNEL ANALYSIS / RATING CURVE COMPUTATION �I OS WA� � MO►� July 15, 2002 PROGRAM INPUT DATA DESCRIPTION VALUE -------------------------------------------------------------------------------- Channel Bottom Slope (ft/ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01 Manning's Roughness Coefficient (n-value) . . . . . . . . . . . . . . . . . . . 0.07 Channel Left Side Slope (horizontal/vertical) . . . . . . . . . . . . . . . 3.0 Channel Right Side Slope (horizontal/vertical) . . . . . . . . . . . . . . 3.0 Channel Bottom Width (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 Minimum Flow Depth (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02 Maximum Flow Depth (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 Incremental Head (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03 COMPUTATION RESULTS Flow Flow Flow Froude Velocity Energy Flow Top Depth Rate Velocity Number Head Head Area Width (ft) (cfs) (fps) (ft) (ft) (sq ft) (ft) -------------------------------------------------------------------------------- 0.02 0.03 0.16 0.195 0.0 0.02 0.16 8.12 0.05 0.12 0.28 0.226 0.001 0.051 0.41 8.3 0.08 0.25 0.39 0.244 0.002 0.082 0.66 8.48 0.11 0.43 0.47 0.257 0.003 0.113 0.92 8.66 0.14 0.65 0.55 0.267 0.005 0.145 1.18 8.84 0.17 0.9 0.62 0.275 0.006 0.176 1.45 9.02 0.2 1.19 0.69 0.282 0.007 0.207 1.72 9.2 0.23 1.51 0.75 0.288 0.009 0.239 2.0 9.38 0.26 1.85 0.81 0.293 0.01 0.27 2.28 9.56 0.29 2.23 0.87 0.298 0.012 0.302 2.57 9.74 0.32 2.64 0.92 0.302 0.013 0.333 2.87 9.92 0.35 3.08 0.97 0.306 0.015 0.365 3.17 10.1 0.38 3.55 1.02 0.31 0.016 0.396 3.47 10.28 --�00.41 4.04 1.07 0.313 0.018 0.428 3.78 10.46 0.44 4.57 1.11 0.316 0.019 0.459 4.1 10.64 0.47 5.12 1.16 0.319 0.021 0.491 4.42 10.82 0.5 5.7 1.2 0.322 0.022 0.522 4.75 11.0 HYDROCALC Hydraulics for Windows, Version 1.2a Copyright (c) 1996 Dodson & Associates, Inc., 5629 FM 1960 West, Suite 314, Houston, TX 77069 Phone: (281)440-3787, Fax: (281)440-4742, Email:software@dodson-hydro.com All Rights Reserved. 6 M007N P EA K F 3.84- Gas F w vJ 1 S Tpo LA e�'A E FOR- A S \.0 L B 10=, v�► LE ►o F0N1C:rl F)-AL- D�S�G�1 MAt jZeQU)IZE SPL1TTllJC -70-T.A,� 2 N O , o D'ES1G 11�G `ry S�QA.�'.�`t� 3 �WA L �- Gil ErS o r� OF 1:PR-o'i\3� I•l c� �NJ�-r cZ C vA�-�r'� 6oP,B17 S7E + A TRAPEZOIDAL CHANNEL ANALYSIS D F-L-D q G w RATING CURVE COMPUTATION 510SvJAl-E I00 July 15, 2002 PROGRAM INPUT DATA DESCRIPTION VALUE -------------------------------------------------------------------------------- Channel Bottom Slope (ft/ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01 Manning's Roughness Coefficient (n-value) . . . . . . . . . . . . . . . . . . . 0.035 Channel Left Side Slope (horizontal/vertical) . . . . . . . . . . . . . . . 3.0 Channel Right Side Slope (horizontal/vertical) . . . . . . . . . . . . . . 3.0 Channel Bottom Width (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 Minimum Flow Depth (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02 Maximum Flow Depth (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.62 Incremental Head (ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03 COMPUTATION RESULTS Flow Flow Flow Froude Velocity Energy Flow Top Depth Rate Velocity Number Head Head Area Width (ft) (cfs) (fps) (ft) (ft) (sq ft) (ft) -------------------------------------------------------------------------------- 0.02 0.05 0.31 0.389 0.002 0.022 0.16 8.12 0.05 0.23 0.57 0.452 0.005 0.055 0.41 8.3 0.08 0.51 0.77 0.488 0.009 0.089 0.66 8.48 0.11 0.87 0.95 0.513 0.014 0.124 0.92 8.66 0.14 1.3 1.1 0.533 0.019 0.159 1.18 8.84 0.17 1.81 1.25 0.549 0.024 0.194 1.45 9.02 0.2 2.38 1.38 0.563 0.03 0.23 1.72 9.2 0.23 3.01 1.51 0.575 0.035 0.265 2.0 9.38 0.26 3.71 1.62 0.586 0.041 0.301 2.28 9.56 0.29 4.47 1.74 0.596 0.047 0.337 2.57 9.74 0.32 5.28 1.84 0.604 0.053 0.373 2.87 9.92 0.35 6.16 1.95 0.612 0.059 0.409 3.17 10.1 0.38 7.1 2.04 0.62 0.065 0.445 3.47 10.28 0.41 8.09 2.14 0.626 0.071 0.481 3.78 10.46 0.44 9.14 2.23 0.633 0.077 0.517 4.1 10.64 0.47 10.25 2.32 0.639 0.083 0.553 4.42 10.82 0.5 11.41 2.4 0.644 0.09 0.59 4.75 11.0 0.53 12.63 2.48 0.65 0.096 0.626 5.08 11.18 -->1. 0.56 13.91 2.57 0.655 0.102 0.662 5.42 11.36 0.59 15.24 2.64 0.659 0.109 0.699 5.76 11.54 0.62 16.63 2.72 0.664 0.115 0.735 6.11 11.72 HYDROCALC Hydraulics for Windows, Version 1.2a Copyright (c) 1996 Dodson & Associates, Inc., 5629 FM 1960 West, Suite 314, Houston, TX 77069 Phone: (281)440-3787, Fax: (281)440-4742, Email:software@dodson-hydro.com All Rights Reserved. 00 `f EAR P F�v�► _ )3. 1� cis