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Home My WebLink AboutSWP272324(2) HYDRAULIC CALCULATIONS FOR P RO P O S E D T OWNH O U S E S rl AL EXPIRES • I- 7 October 1996 Applicant : Engineer : West Tier Development Del Erickson, P. E. Peter Tiersma 15020 S. E. 46th St . P.O. Box 1029 Bellevue, Wa. 98006 Woodinville, WA. 98072 Tel : 747-5825 Tel : 486-9825 f:4 . RECEIVED OCT 16 1996 REV CITY OF Rid ON ING S O S L S = N F ORMAT I O N KING COUNTY, W A S H I N G T O N, SURFACE W A T i'ER D E S IGN N4 A N U A L (2) CN values can be area weighted when they apply to pervious areas of similar CN's (within 20 CN points)_ However, high CN areas should not be combined with low CN areas (unless the low CN areas are less than I S% of the subbasin). In this case, separate hydrographs should be generated and summed to form one hydrograph. FIGURIP 3.5.2A HYDROLOGIC SOIL GROUP OF THE SOILS INKING COUNTY HYDROLOGIC HYDROLOGIC SOIL GROUP GROUP' SOIL GROUP GROUP• Alderwood C Orcas Peat D Arents, Alderwood Material C Oridia D Arents, Everett Material B Oval C Beausile C Pilchuck C Bellingham D Puget D Briscot D Puyallup B Buckley - D Ragnar B Coastal Beaches Variable Renton D Earlmont Sill Loam D Riverwash Variable Edgewick C Sala[ C Everett A/B `Sammamish D Indianola A Seattle D Kilsap C Shacar D Klaus C Si Sill C Mixed Alluvial Land Variable Snohomish D Neilson A Sultan C Newberg B Tukwila D Nooksack C Urban Variable Normal Sandy Loam D Woodinville D HYDROLOGIC SOIL GROUP CLASSIFICATIONS A. (Low runoff potential). Soils having high infiltration rates, even when thoroughly wetted, and consisting chiefly of deep, well-to-excessively drained sands or gravels. These soils have a high rate of water transmission. B. (Moderately low runoff potential), Soils having moderate infiltration rates when thoroughly wetted, and consisting chiefly of moderately fine to moderately coarse textures. These soils have a moderate rate of water transmission. - C. (Moderately high runoff polentiaQ. Soils having slow infiltration rates when thoroughly wetted, and consisting chiefly of soils wAh a layer that impedes downward movement of water, or solls with moderately fine to fine textures. These soils have a slow rate of water transmission. D. (High runoff potential). Soils having very slow infiltration rates when thoroughly wetted and consisting chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils v+ilh a hardpan or clay layer at or near the surface, and shallow soils over nearly impervious materLil. These soils have a very slow rate of water transmission. From SCS, TR-55, Second Edition, June 1936, Exhibit A-1. Revisions made from SCS, Soil Interpretation Record, Form #5, September 19M. GD 3.5.2-2 i' t1/92 SATE di iLE (CITY P.O.)10 M1.1'Z 30" 6 MI. TO INTE RS IP lE 90 905 P.P.I (Joins sheet 5) /bl.f. r95A0UAHILA � IF • _ I I ` +f''; � rl �' 1'•t•_�•lira...'/ ur rll 1 I �� •I i ..1r AmC ' T '9 413 ABC I mil. l ••' ra`r� 8 • Pµk �,4 'l.t 1v y _ _ p a IV r ABC +i An • • r• r'• af.r 1_ •_ ��•1 r Tral I �I it•EV8 Atnleh 0. 94 F'- r e ,'• } ".t" 3 Ur Amr n `Feld I 7 � T � I y I Greenwood C� r ` p°p r r n AgC EvC � 1pi� I b06 ~. ppp ° } ° 1 Cemi U An t c .• y °Perk F iGPAV FL i PIT a 11 a''. <<.p e ••� i Pc 1 BM 1 • ♦ �� I m-��A 32/!, appe`n o 3 j e C 09 AkF i` F.vC -_-IIAkF ap F .. •.fit • - f '.• � Ur 1 U Py `' i �'1 AkF m AkP ✓ �• o ' _i ur I _ ^I' I Inc I .. t •. ', `r 8M .` i i � - t+ • x - BM�37 Akf AHc 1 _5(ASt9. AmC a aaa '.C- t. �. A C Rh '+ , '\ • ,• , G"o/°as'' I r. `\ AHD 'C y ` • � to -� • Substai AmG o r �., aR� `^-__ __ . �• ''. •,' a° M • _ _ _ __` ABC _ _ I •�/`. •�a�_AkF -=a 8.11 • � \ABD 20 ppap'4{4° 21 Ir • a`l�`• ®♦ _ 6._ ...mot p 9 i 9�0 pp�pa i ep I F ABC ` a AkFI apc'f • •• p. � a I ' 'AkF au [ i'..i+• •k 6 �� a .,I AHC •'li V \ Pu . { \ 515 _ .IOLIEp.ap .. ..,ti• 48eC ' • EvC et) It I u •n• .n,r l •iAHD M IB - - 18 ___-- • 76 "a w _ ABC Tu i _ • •. __-- __ _ _ Sk npc AHO , BMp I `� u AmC I ABB`1 p gM 29 . .' o, �203 A 8 ! I6G I ABC y � ♦ - I I ° 151 lh I ° IAHD �n N° e t I DESCRIPTIONS OF THE SOILSThis section describes the soil series and map- Alderwood 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 -ibis 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 Alderwood 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- 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 "liow This Survey 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. 83--12 to 27 inches, grayish-brown (2.SY 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.SY 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 beer placed. The woodland desl.g- IIC--27 to 60 inches, grayish-brown (2.5Y 5/2) , nation and the page for the description of cacti weakly to strongly consolidated till, light capability unit can be found by referring to the gray (2.SY 7/2) dry; common, medium, distinct "Guide to Mapping Units" at the back of this survey. mottles of light olive brawn 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 survey, '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 Alderwood Series — layers in the C horizon Blake 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 ub to 15 percent about 500 F. The frost-free season is ISO to 200 Alderwood soils that have slopes more gentle or days. Elevation ranges from 100 to 800 feet. steeper than 6 to 1S percent. Some areas in New- In a representative profile, the surface layer castle !fills 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. 8 Permeability is moderately rapid in the surface Arents, Alderwood Material 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 Arents, Alderwood material consists of Alderwood roots enter the substratum through cracks. Water soils that have been so disturbed through urban- moves on top of the substratum in winter. Available ization that they no longer can be classified with water capacity is low. Runoff is slow to medium, the Alderwood series.' These soils, however, have and the hazard of erosion is moderate, many similar features. The upper part of the soil, This soil is used for timber, pasture, berries, to a depth of 20 to 40 inches, is brown to dark- and row crops, and for urban development. Capability brown gravelly sandy loam. Below this is a grayish- unit IVe-2; woodland group 3dl. brown, consolidated and impervious substratum. Alderwood gravelly sandy loam, 0 to 6 ercent .Slopes generally range from 0 to 15 percent. slopes (Ag B) .--This soil"i's nearly level an - These soils are used for urban development. undulating. It is similar to Alderwood gravelly sandy loam, 6 to 15 percent slopes, but in places its surface layer is 2 to 3 inches thicker. Areas Vents, Alderwood material , 0 to 6 percent slopes are irregular in shape and range from 10 acres to (Am 8) .--In many areas tiffs snit hs level, as a slightly more than 600 acres in size. result of shaping during construction for urban Some areas are as much as 15 percent included facilities. Areas are rectangular in shape and Norma, Bellingham, Tukwila, and Slialcar soils, all range from 5 acres to about 4n0 acres in size. of which are poorly drained; and some areas in the Representative profile of Arents, Alderwood vicinity of Fnumclaw are as much as 10 percent material, 0 to 6 percent slopes, in an urban area, Buckley soils. 1,300 feet west and 350 feet south of the northeast Runoff is slow, and the erosion hazard is corner of sec. 23, T. 25 N. , R. 5 E. : slight. This Alderwood soil is used for timber, pasture, 0 to 26 inches, dark-brown (10YR 4/3) gravelly berries, and.-row crops, and for..urban development. _ sandy loam, pale brown (10YR,6/3) dry,; Capability unit IVe-2; woodland group 3,12. massive; slightly hard, very friable, non- sticky, nonelastic; many roots; medium acid; Alderwood gravelly sandy loam, 15 to 30 ercent abrupt, smooth boundary. 23 to 29 inches slopes (Ag U) .--Uep th to the substratum in this soil thick. varies within short distances, but is commonly 26 to 60 inches, grayish-brawn (2.5Y S/2) weakly about 40 inches. Areas are elongated and range consolidated to strongly consolidated glacial from 7 to about 250 acres in size. till, light brownish gray (2,SY 6/2) dry; Soils included with this soil in mapping make common, medium, prominent mottles of yellowish up no more than 30 percent of the total acreage. brown (10YR 5/6) moist; massive; no roots; Some areas are up to 25 percent Everett soils that _ medium acid. Many feet thick. have slopes of 15 ff 30 percent, and some areas are up to 2 percent Bellingham, Norma, and Seattle soils, The upper, very friable part of the soil extends which are in depressions. Some areas, especially to a depth of 20 to 40 inches and ranges from dark on Squak Mountain, in Newcastle lulls, and north of grayish brown to dark yellowish brown. Tiger Mountain, are 25 percent Beausite and Ovall Some areas are up to 30 percent included soils soils. Beausite soils are underlain by sandstone, that are similar to this soil material, but either and Oval soils by andesite. shallower,or deeper over the compact substratum; Ruoff is medium, and -the-erosion hazard is and some areas are 5 to 10 percent very gravelly severe. The slippage potential is moderate. Everett soils and sandy Indianola soils. This Alderwood soil is used mostly for timber. This Arents, Alderwood soil is moderately well Some areas on the lower parts of slopes are used drained. Permeability in the upper, disturbed soil for pasture. Capability unit VIe-2; woodland group material is moderately rapid to moderately slow, 3d1. depending on its compaction during construction. Alderwood and Ki.tsap soils, very steep (Ak P) .-- The substratum is very slowly permeable. Roots This mapping unit is about SD percent Alderwood penetrate to and tend to mat on the surface of the gravelly sandy loam and 25 percent Kitsap silt consolidated substratum. Some roots enter the loam. Slopes are 25 to 70 percent. Distribution substratum through cracks. Water moves on top of of tine soils varies greatly within short distances. the substratum in winter. Available water capacity About 15 percent of some mapped areas is an is low. Runoff is slow, and the erosion hazard is included, unnamed, very deep, moderately coarse slight. textured soil; and about 10 percent of some areas This soil is used for urban development. Ca- is a very deep, coarse-textured Indianola soil. pability unit IVe72; woodland group 3d2. Drainage and permeability vary. Runoff is rapid / to very rapid, and the erosion hazard is severe to Arents, Alderwood material, 6 to 15 percent very severe. The slippage potential is severe. slopes (AmC .--This soil has convex slopes. Areas These soils are used for timber. Capability are rectangular in shape and range from 10 acres .to whit Vlle-1; woodland group 2,11. about 450 acres in size. 10 2EXI-KmnxIrs �'041, g ird PRO wA E I `s�� i. ► ++ NSW pill IN! a OW a MURTM ®� '1 • ,RA �"'` Rho DIM A kill-04 rga qT Zvi Hk •f AVAI VF4W - r F� KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL fAB f 3.5.2II SCS %V1iS'1'1iRN WASIIIN(: ON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1A rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC SOIL GROUP LAND USE DESCRIPTION A B C D Cultivated land(1): winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands _74 82- 89 92 Meadow or pasture: 65 -78 85 89 Wood or forest land: undisturbed or older second growth 42 64 76 81 Wood or forest land: young second growth or brush 55 72 4% 86 Orchard: with cover crop 81 88 92 94 Open spaces, lawns, parks,-golf coufses, cemeteries, landscaping. good condition: grass cover on 75% or more of the area 68 80 86 90 fair condition: grass cover on 50% to 75% of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 91 Dirt roads and 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) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected - 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 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 55 Planned unit developments. % impervious condominiums, apartments, must be computed commercial business and Industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 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. 3.5.2-3 11192 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5.2C "n" AND "k" VALUES USED IN TIME CALCULATIONS FOR HYDROGRAPHS n;Sheet Flow Equation Manning'a Values(For the Initial J00 6 of travel) n,- Smooth surfaces(concrete,asphalt,gravel,or bare hard packed soli) 0.011 Fallow fields or loose soft surface(no residue) 0.05 Cultivated sol with residua cover(s <= 0.20 ft/ft) 0.06 CuMriled sal with residue cover(S1 020 11/111 0.17 Short prahle grass and lawns 0.15 Dense grasses 0.24 Bermuda grass 0.41 Range(natural) 0.13 Woods or forest with light underbrush 0.40 Woods or forest with dense underbrush 0.90 'Manning values for sheet flow ody,hom Overton and Meadows 1976(See TR55.19B6) 'k-Values Used In Travel Tima/Tlrne of Concerdmllon Calculallons Shaflow Coocenhuad Flow (After the Initial J00 0.of sheet flow,Fi -0.1) kr 1. Forest with heavy ground liner and meadows(n-0.10) 3 2. Brushy ground with some uses in-0.0(0) 5 0. Fallow or minimum tnlage cultivation in -OO410) a a. High grass in - 0.035) - 9 5. Shon grass,pasture and Weeds(n-U.000) - I I 6, Nearly bare growl(n-0.025) 13 7. Faved and gravel areas(n-0.012) 27 Clanngl Flow,(mlemallenll(M the beginning of visible channels'.R-0.2) k, _ 1. Forested aware with heavy ground Idler in - 0,10) 5 ' 2. ForestM rl,mmge cnwse/ravine weir defined channel bad(n=0.050) 10 3. Rock lined watorway in-0035) 15 a. Grassed waterway In-DOJO) 17 5. Earth lined waterway(n=0025) ._ 20 6. CMp pipe(n-0024) 21 7. Concrete pipe(OO12) 42 B. oil.,waterways and pipes 0.508/n Channel Flow(Contlnucus stream,R - 0.4) k, 9. Meandering stream with some pods in-0.040) 20 10. RockJlned stream(n-0.0115) 23 I1. Grass Jlned stream(n-0.030) 27 12. Other streams,man-made channels and pipe 0.807/n" -- --See Chapter 5,Table 5.3.6C for addelonal Mannings-n'Values for open channels 3.5.2-7 IryO KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL where T, = time of concentration (min), and m = number of flow segments Sheet Flow: Sheet flow Is flow over plane surfaces. It usually occurs In the headwater of streams. With sheet flow, the friction value (n,) (a modified Manning's effective roughness coefficient that Includes the effect of raindrop impact; drag over the plane surface; obstacles such as litter, crop ridges, and rocks; and erosion and transportation of sediment) is used. These n,values are for very shallow now depths of about 0.1 foot and are only used for travel lengths up to 300 feet. Table 3.5.2.0 gives Manning's n,values for sheet flow for various surface conditions. For sheet flow up to 300 feet, use Manning's kinematic solution to directly compute T,: Sheet flow: Tt = 0.42 (n,L)a'a (p 1 0.5 (So) 0.4 _. where U T, = travel time (min), n, = sheet flow Manning's effective roughness coefficient (from Table 3.5.2C), L = flow length (ft), Pz = 2-year, 24-hour rainfall (in), (see Figure 3.5.1C) and s, = slope of hydraulic grade line (land slope, ft/ft) Velocity Equation A commonly used method of computing average velocity of flow, once It has measurable depth, is the following equation: V __kJs7 where: V = velocity (ft/s) k = time of concentration velocity factor (ft/s) s, = slope of flow path (ft/ft) "k" Is computed for various land covers and channel characteristics with assumptions made for hydraulic radius using the following rearrangement of Manning's equation: k = (1.49 (R) 0667 )/n. where P` R = an assumed hydraulic radius n = Manning's roughness coefficient for open channel flow (from Table 4.3.7B in Chapter 4) 3.5.2-6 1/90 I I k89'Ol7YN/ I I �� `£ur ' - JJD J. O' � \ 1 ,� \ \ / � � 1 ✓/ \ \ ,— wv TRcs I I o 1 alp M \ \ r I I I �•' , \ \ \ \ � \ \ / � /� � \\ � -�`— �.--. e14a III rill \A \ II \ 4P / / I — — —\_-- — ve._ —, — — 5s'1sn rct —� / sw am I I am yes' as I R,t I N69"06'01`W' 3J0J9' •� — 5, am / S = Z E D E T E N T =O N VAU L T 6•Z = Q'd CT b Lz-Z - 0`(388 z Lcr—A Z 3sCl-� C3-1 11 aid _C'pC;7 = - Ot x c:;. --- O* LZ 6 '�4 -- C. LS ; b` x 4 --- . P d dw = -z ---------------------------------------------------------------------- ******************** S .C . S . TYPE-lA DISTRIBUTION ******************** ********* 2-YEAR 24-HOUR STORM **** 2 . 00" TOTAL PRECIP . ********* ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A( IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 0 . 5, 86, 1 . 12 , 98 , 6 . 3 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 1 . 6 . 5 86 . 0 1 . 1 98 . 0 6 . 3 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) . 63 7 . 67 8754 ENTER [d: l [pathlfilename [ . extl FOR STORAGE OF COMPUTED HYDROGRAPH: C2 ------------------------------------------------------------- ******************** S.C. S. TYPE-lA DISTRIBUTION ******************** ********* 10-YEAR 24-HOUR STORM **** 2 . 90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A( IMPERV) , CN( IMPERV) , TC FOR BASIN NO. 1 0 . 5, 86, 1 . 12 , 98 , 6. 3 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 1 . 6 . 5 86 . 0 1 . 1 98 . 0 6 . 3 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) . 99 7 . 67 13711 ENTER [d: l [pathlfilename [ .extl FOR STORAGE OF COMPUTED HYDROGRAPH: C10 ---------------------------------------------------------------------- ******************** S .C. S . TYPE-lA DISTRIBUTION ******************** ********* 100-YEAR 24-HOUR STORM **** 3 . 90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A( IMPERV) , CN( IMPERV) , TC FOR BASIN NO. 1 0 . 5, 86, 1 . 12 , 98 , 6 . 3 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 1 . 6 . 5 86 . 0 1 . 1 98 . 0 6 . 3 ' PEAK-Q(CFS ) T-PEAK(HRS) VOL(CU-FT) 1 . 41 7 . 67 19.35$6 ENTER [d: l [pathlfilename [ . extl FOR STORAGE OF COMPUTED HYDROGRAPH: C100 =M PER.v� cum G.1 =9 8 8c.e5.o----- --- z� 4 ,c SS 3ti Pb ILZc. - - ZIZ. O -- 1. CL A� - rA- � - Pz-- p,� = z.9 - - --------------------------------- __ _ xxx*xxxx*xxxxxxxxxxx S. C. S . TYPE-IA DISTRIBUTION *********x****xxxxxx ********* 100-YEAR 24-HOUR STORM **** 3 . 90" TOTAL PRECIP . ********* ---------------------------------------------------------- _____ ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 1 . 57, 81 , 0 . 05, 98 , 26. 2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES ) A CN A CN 1 . 6 1 . 6 81 . 0 . 1 98 . 0 26. 2 PEAK-Q(CFS) T-PEAK(HRS) VOL (CU-FT) . 61 7 . 83 12215 ---------- T� = o gZlzzS mo o .Z4> 0 4 L z ZZS' 7--z = 0.04 V. --PL ---------------------------------------------------------------------- - - - ***x**************** S. C. S . TYPE-IA DISTRIBUTION *********xx*****x*** ********* 2-YEAR 24-HOUR STORM **** 2 . 00" TOTAL PRECIP . *****x*** ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A( IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 1 . 57, 81 , 0 . 05, 98 , 26 . 2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES) A CN A CN 1 . 6 1 . 6 81 . 0 . 1 98 . 0 26 . 2 PEAK-Q(CFS) T-PEAK(HRS) VOL (CU-FT) . 13 7 . 83 3755 ---------------------------------------------------------------------- ******************** S .C . S . TYPE-IA DISTRIBUTION x******************* ********* 10-YEAR 24-HOUR STORM **** 2 . 90" TOTAL PRECIP . *x*x***** ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A( IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 1 . 57 , 81 , 0 . 05 , 98 , 26 . 2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES ) A CN A CN 1 . 6 1 . 6 81 . 0 . 1 98 . 0 26 . 2 PEAK-Q(CFS) T-PEAK(HRS ) VOL(CU-FT) . 34 7 . 83 7491