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Home My WebLink About03339 - Technical Information Report P o� KRISTE N WOO DS � Prelimina Plat �, rY � LUA 05-056 3200 Block Main Avenue South TECHNICAL INF4RMATION REPORT May 18, Z006 Updated June 25, 2006 Prepared for KD Properties — Benson, LLC Attn: Johnathan Kurth 1201 Monster Road SW Suite 320 Renton, Washington 98055 Office: (425) 228-5959 Fax: (425) 226-9227 Submitted by �y L. � �' o� wAs�r Offe Engineers, PLLC � �, ,, • Attn: Darrell Offe, P.E. '��,� o 13932 SE 159"' Place A � x• Renton, WA 98058 � Office: (425) 260-3412 ��27�0 w �/„ ISTER �� Fax: (425) 988-0292 Ss�oNAL E�� EXPIR�S 7i // �3339 Project Description The purpose of this report is to present a preliminary drainage report and downstream analysis for the proposed Kristen Woods Subdivision in accordance with the City of Renton requirements. The project is located within the City limits of Renton. The Kristen Woods project is a proposal to create 21 lot single-family residential lots from two existing properties comprising of 3.84 acres. The project is two separate pieces of property with one tax account number (292305-9010) divided by Benson Drive South (SR 515). The East parcel is located at the 3200 block of Cedar Avenue South. The West parcel is located at the 3200 block of Main Avenue South. See Figure 1 for a vicinity map of the project and Figure 2 in Appendix A for an existing site survey of the project. Figure 3 shows the proposed site plan for the development. The East parcel is bounded to the West by Benson Drive South; to the North by a previous development called Vctoria Hills; to the East and South by large un-developed single-family parcels. I The West parcel is bounded by single-family development on the west, north, and south sides. To the east is Benson Drive South. Review of Resouroes Critical Drainage Area Map • Panther Lake Wetlands Subbasin • Rolling Hills Draiange BasoMay Creek S Flood plain/floodway (FEMA) Maps • There is no mapped floodplain in the immediate area per the available FEMA map. The site is located in Zone X per the Flood Insurance Rate Map (FIRM) map number 53033C0669 F. See Appendix B for a copy of the FIRM map. The map also indicates that the area is outside of the 500-year flood plain. Sensitive Areas � Wetlands—There are no known wetlands located on the project. • Streams and 100 Year Flood Plains—There are no apparent streams or floodplains that go through or abut the project. • Erosion Hazard Areas—There are no landslide hazard areas for the project. • Landslide Hazard Areas—There are designated sensitive slopes on and adjoining the property. The cut slope for Benson Drive South was constructed at a 2:1 slope (50%). Along the northerly portion of the east parcel there are designated slide hazard areas. These slopes are addresses within the soil report prepared for the project. Page z c:�ofFe engineers\projects\davis group\kristen woods�tir�storm report.doc r • Seismic Hazard Areas—The area is not mapped as a seismic hazard area. • Coal Mine Hazard Areas—The property does not appear to be located within a designed coalmine hazard area. There were mines located north and south of the praperty. U.S. Department of Agriculture, King County Soils Survey • The soils on the site are classified as Alderwood gravelly and loam (AgC), 15 to 40 percent slopes. These soils types are described in the Soil Survey of King County Area, Washington (Soil Conservation Service [SCS], 1973). Figures 4 and 5 contain the portion of the SCS map in the vicinity of the project site and the index to soil units. Alderwood soils are characterized as gravelly sandy loam to a depth of 12 inches and gravelly, sand loam with organics between 12 and 27 inches. This gravelly, sand loam structure is underlain by weekly to strongly consolidated till to a depth of 60 inches. Permeability is moderately rapid in the surface layers and very slow in the till layer, runoff is slow to medium, and the potentia{ for erosion is moderate. Flow Control Applications Map • The site is located in a Level 1 area according to the Flow Control Map; The City of Renton is requiring detention storage to the 100-year event with a 30% factor of safety. The flow control will be sized based upon the 1992 Drainage Manual (match the pre-developed 2,10 and 100 and plus 30%). Water Quality Applications Map • The site is located in a Basic Water Quality Treatment Area. The water quality facility will be sized based upon the 1992 Manual for 1/3 of the developed volume form the 2 year storm event. Landslide Hazard Drainage Area Map • The site is not located in a landslide hazard drainage area. Field Inspection Offe Engineers has visited the site on several occasions. The most resent visit occurred the morning of March 18, 2005. The weather conditions were dry and warm. The easterly parcel: ', The ground slopes from Cedar Ave towards Benson Drive on the west. On the � northerly portion is located a drainage course at the bottom of a steep ravine. The I� drainage course starts at Cedar Ave and ends in the right-of-way of Benson Drive. Thi-> area drains into Benson Drive conveyance svstem; then continues North towards Rollir Hills Creek approximately 1 mile Nort , The westerly parc� The grounc. . . ,:._ �.. . . . . .. ground is heavily wooded and over ground with blackberries. The drainage from this area flows to the west into the conveyance system built for the Winsper subdivision. Page 3 c:\offe engineers�projects\davis group\kristen woods\tir�storm report.doc The drainage continues through the detention pond for Winsper then is conveyed to the Panther Creek wetland at the bottom of the hill. � Appendix B includes photos taken on and around the project site. II Review of the 8 Core Requirements and 5 Special Requirements of the 1998 '� King County Surface Water Design Manual Offe Engineers has reviewed the Core and Special Requirements in Chapter 1 of the King County Surface Water Design Manual, and addresses each of the requirements as follows: Core Requirement No. 1 —Discharge at Natura/Location East Property - Currently the site discharge is sheet flow along the entire westerly edge. Flowing over the cut slope for Benson Drive, across the sidewalk and into the catch basins located within the gutter. A small portion of this area flows into the northerly drainage course, which by inspection appears to need maintenance of the outlet within Benson Drive. West Property—This area drains sheet flows to the west onto existing residential property and South 32"d Place. The proposal would be to tight-line the storm drainage and convey the discharge into the system at the end of South 32"d Place. Core Requirement No. 2—Ofl�site Ana/ysis East Property - The upstream area along Cedar Avenue drains into the existing roadway conveyance system and is discharges at the northeast corner of the property into the existing drainage course. Along the easterly edge of Cedar Avenue is a drainage ditch which cuts-off drainage from entering the property. The ditch flows along the east side of Cedar Ave towards the south. The downstream system below Kristen Woods is the drainage conveyance system for Benson Drive South (SR-515). This system is made up of catch basins, pipes, open ditches and a control weir located along the east side of Thomas Teasdale Park. The system was visually inspected during the site inspection. The downst►-eam open channel along the west side of Benson needs to be maintained along with the outlet of the on site drainage course. � See the attached off-site analysis drainage system map showing the drainage route. Cor�e Requirement No. 3—flow Contro/ The proposed project will be required to provide detention for up to and including the 100-year storm event plus a 30% factor of safety. Core Requirement No. 4—Conveyanae System The proposed on-site conveyance improvements will include curb, catch basins and a pipe network for collection of surFace runoff from landscape, driveways, roadways, and sidewalks. Roof downspouts will be connected via tight line to the conveyance system. As part of the final engineering design for this project, it will be required to demonstrate �', that the storm drainage system can convey the peak flow from 25-year storm event, !, Page 4 c:\offe engineers\projects\davis group�kristen woods\tir�storm repori.doc and that the 100-year storm event does not create or aggravate a "severe flooding problem". Core Requirement No. 5—Erosion and Sediment Contro/ A Temporary Erosion and Sediment Control Plan implementing the Best Management Practices will be designed as part of the final engineering plans for the project in accordance with City of Renton requirements. Core Requirement No. 6—Maint�enanc�e and Operations The Maintenance and Operations Manual for the Kristen Woods Subdivision will be included in the Final Storm Drainage Report as part of the final engineering design for the project. Core Requirement No. 7—Financia/Guarantees and Liabi/ity The Financial Guarantees and Liabilities will be required prior to the project being finalized by the City of Renton. Core Requirement No. 8— Water Qua/ity The project will provide the required water quality facility as part of the final engineering design. The site is located in the basic water quality treatment area. , Specia/Re+quirement No. 1 —Adopted Area-Spe�cifc Requirements The project is located within the Rolling Hills Creek and Panther Creek drainage sub- basins. The project is located within the Green River Drainage basin. Speaia/Requirement No. 2—F/oadp/ain/F/oodway De/ineation This requirement does not apply. Sp�cia/Requirement No. 3—f/oo�d Prote�clion Faci/ities This requirement does not apply. Sp�cia/Requirement No. 4—Sourre Contro/s This requirement does not apply because the project is located in the basic water quality treatment area. Sp�ecia/Requirement No. 5—Oi/Contro/ This requirement does not apply. Page s , c:\offe engineers\projects\davis yroup�kristen woods\tir�storm report.doc ' i Appendix A Detention sizing w/ calculations KING COU '� TY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5.2a SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS - SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve rwmbers for selected ag�icultural, suburban and urban tand use for Type tA rainfall dfstributbn, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC SOIL GROUP LAND USE DESCRIPTION A B C D Cultivated land(t): winter conditlon 86 91 9d 95 Mountain open areas: low g►owing 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 86 Orchard: with cover crop 8� 88 92 94 Open spaces, lawns, parks, gdf courses, cemeteries, landscaping. , good condition_ grass cover on 75% ' or more of the area 68 80 O 90 • fair condition: grass cover on 50% to 75% of the area 77 BS 90 92 Gravel roads and parking lots 76 85 89 91 — Dirt roads and parking lots 72 82 $� 89 impervious surfaces, pavement, roofs, etc. 98 98 98 98 Open water bodies: lakes, weifands, ponds, etc. t00 100 0 t00 Single Family Residential (2) Dweliing Unit/Gross Acre 96 Impervious (3) 1.0 DU/GA t 5 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.Q DU/GA a2 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50 6.0 DU/GA 52 6.5 DU/GA �4 7.0 DU/GA 56 Planned unit develo�ments, % impervious condominiums; apartments, must be computed comme,�l�l business and indusirial areas. (t) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section a, Hydrology, Chapter 9, August 1972. (2) Assumes rooE 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. '- �j 3.5.2-3 _ 11l92 �' � � � � ' � � �i'��;�'� ;�f �iiL � � � . ��'a;:3�i� '� � !�t��J�� , •'1, �� `, , ��,�'i� ' � '�'� � � N� ��V�� , �� ' �� : ��..�� w �� , � � � �, i,� � � �3 �,-�, ��— � /,��/ 11�: �� , e��l�� .. �%, � � �.■..�f.�� •t � •-- \� .. ,. � - ,�iR�� „�� - �. *1�� .�� , •� �.��''-�1��1'a�� ,,"�L�►'�� ,T�1��7:�f -� , n .�w r�� ` •�- `� �� _ y � f^�� r a ,�� "' ' �� P -� � � � ,� ' � . ..��, /� � ==" �� :i�t �` ��+=eli� ��i�in�� ` �� , :•,`�i:[�� '�i:�ll' �� '.ii iV� i�� .,�' w� ,�� .�.��t��4�.�� "��=,•,d.�.�.r�� ;'.� � �� _.� �.� �1 ��h�r�<r�.��.�� ,� , � �..,�.i,,,�c�,�.�.,. � �,,• �'� � ��i�� j ,��i�I!,;��►�,�..+..�.. �, ��,�,. 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V Z H N � � Z � � a m � � W � 6/14/06 10 :44 : 28 am RN Parnell Com,par�y page 1 KRISTEN WOODS WEST BASIN BASIN SiJMMARY BASIN ID: EX-W-002 NAME: EXISTING W�ST BASIN - 2YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 14 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 2 . 14 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 76 . 00 0 . 00 TC. . . . : 53 . 87 min 0 . 00 min ABSTR.ACTION COEFF: 0 .20 TcReach - Sheet : 300 . 00 ns : 0 . 8000 p2yr: 2 . 00 s : 0 . 1300 PEAK RATE: ;�0. 0 cts VOL: 0 . 07 Ac-ft TIME : 760 min ( BASIN ID: EX-W-010 NAME: EXISTING WEST BASTN - lOYR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 14 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 2 . 14 Acres 0 . 00 Acres TIME INTERVAL. . . . : 1� .00 min CN. . . . : 76 . 00 0 . 00 TC. . . . : 53 . 87 min 0 . 00 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet �: 300 . 00 ns : 0 . 8000 p2yr: 2 . 00 s : 0 . 1300 PEAK RATE: 0 . 19 fs VOL: 0 . 17 Ac-ft TIME: 500 min BASIN ID: EX-W-100 NAME: EXISTING WEST BASIN - 100YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 14 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 2 . 14 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 76 . 00 0 . 00 TC. . . . : 53 . 87 min d . 00 min ABSTRACTION COEFF� 0 .20 TcReach - Sheet �L: 300 .00 ns : 0 . 8000 p2yr: 2 . 00 s : 0 . 1300 PEAK RATE: 0 .41�' cfs VOL: 0 . 30 Ac-ft TIME: 490 min / 6/14/06 10 :44 : 38 am RN Parnell Company page 1 KRISTEN WOODS WEST BASIN --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMNIARY BASIN ID: DV-W-002 NAME: DEVELOPED WEST BASIN - 2YR SBUH METHODOLOGY TOTAL AR.EA. . . . . . . : 2 . 14 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 95 Acres 1 . 19 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 7 .43 min 7 .43 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s :0 . 0200 TcReach - Channel L: 250 . 00 kc :42 . 00 s : 0 . 1000 impTcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr : 2 . 00 s : 0 . 0200 impTcReach - Channel L: 250 . 00 kc:42 . 00 s : 0 . 1000 PEAK R.ATE: 0 . 74 cfs VOL: 0 . 24 Ac-ft TIME: 480 min BASIN ID: DV-W-010 NAME: DEVELOPED WEST BASIN - lOYR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 14 Acres BASEFLOWS : 0 . 00 cfs I RAINFALL TYPE. . . . : KC24HR PERV IMP I PRECIPITATZON. . . . : 2 . 90 inches AREA. . : 0 . 95 Acres � . 19 Acres 'I TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 I TC. . . . : 7 . 43 min 7 .43 min � ABSTRACTION COEFF: 0 .20 I TcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s: 0 . 0200 TcReach - Channel L: 250 . 00 kc:42 . 00 s: 0 . 1000 impTcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . Q0 s : 0 . 0200 impTcReach - Channel L: 250 . 00 kc:42 . �0 s: 0 . 1000 PEAK RATE: 1 .20 cfs VOL: 0 . 39 Ac-ft TIME : 480 min BASIN ID: DV-W-100 NAME: DEVELOPED WEST BASIN - 100YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 14 Acres BASEFLOWS : 0 . 00 cfs RAINFALL 'TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 95 Acres 1 . 19 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . _ : 86 . 00 98 . 00 TC. . . . : 7 .43 min 7 .43 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s:0 . 0200 TcReach - Channel L: 250 . 00 kc :42 . 00 s : 0 . 1000 impTcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 .00 s : 0 . 0200 impTcReach - Channel L: 250 . 00 kc :42 . 00 s: 0 . 1000 PEAK RATE: 1 . 73 cfs VOL: 0 . 56 Ac-ft TIME: 480 min 6/14/06 10 :23 : 0 am RN Parnell Company page 1 KRISTEN WOODS WEST BASIN --------------------------------------------------------------------- --------------------------------------------------------------------- STAGE STORAGE TABLE RECTANGULAR VAULT ID No. WEST-VLT Description: WEST VAULT Length: 53 . 00 ft . Width: 17 . 00 ft . voids : 1 . 000 STRGE <---STORAGE----> STAGE <----5'PORAG6----> STAGE <----STORAGE----> STAGE �----STOR.4GE----> (Et) ---cf-- --Ac-Ft- (ft) ---cf--- -Ac-Ft- (ft) ---cf--- --Ac-Ft- i;ft) --cf-- --Ac-Ft- 100.00 0.0000 0.0000 104.20 3784 0.0869 108.40 7568 0.1737 :i2.60 11353 0.2606 100.10 90.100 0.0021. 104.30 3874 0.0889 108.50 7656 0.1756 112.70 11443 0.2627 100.20 180.20 0.0041 109.40 3964 O.C910 108.60 7749 0.1779 112.80 11533 0.2648 -00.30 270.30 0.0062 104.50 4054 0.0931 108.70 7839 0.1800 112.90 11623 0.2668 100.40 360.40 0.0083 104.60 4145 0.0951 106.80 7929 0.1820 113.00 11713 0.2689 100.50 450.50 0.0103 104.70 4235 C.0972 108.90 8019 0.1841 113.10 11803 0.2710 100.60 540.60 0.0124 104.80 4325 0.0993 109.00 8109 0.1862 113.20 11893 O.Z�30 100.70 630.70 0_0145 104.90 4415 0.1014 109.10 8199 0.1882 113.30 11983 C.2751 100.80 720.B0 0.0165 105.00 45C5 0.1034 109.20 6289 0.1903 113.40 ':2073 0.2772 :00.90 810.90 0.0186 105.10 4595 0.1055 109.30 8379 0_1924 113-50 12:63 0.2792 i01.00 901.00 0.0207 105.20 4685 0.1076 109.40 8969 0.1994 113.60 12254 0.2813 :01.10 991.10 0.0228 105.30 4775 0.1096 1C9.50 8559 0.1965 113.70 12344 0.2834 101.20 1Q81 0.0248 105.90 4865 0.1117 1C9.60 8650 0.1986 113.80 12434 0.2654 101.36 1171 0.0269 1O5.5D 4955 0.1138 109.70 8740 0.2005 123.90 12524 0.2675 101.40 1261 0.0290 105.60 5046 0.1158 109.80 8830 0.2027 1I4.00 12614 0.2696 101.50 1352 0.0310 105.70 5136 0.1179 :09.90 8920 0.2048 114.10 12709 0.2916 10:.60 1442 0.0331 105.80 5226 0.1200 110.00 901Q 0.2C68 114.20 12799 C.2937 101.70 1532 0.0352 105.90 5316 0.1220 110-10 9100 0.2089 114.30 12889 0.2958 101.80 1622 0_0372 106.00 5406 0.1241 110.20 9190 0.2110 114.40 12979 0.2979 :01.90 1712 0.0393 306.10 5496 0.1262 110.30 9280 0.2130 114.50 13064 0.2999 102.00 1802 0.0414 106.20 5586 0.1282 11Q.40 9370 0.2151 114.60 13155 0.3020 i02.10 1892 0.0434 106.3D 5676 0.1303 110.50 9460 0.2172 114.70 13245 0.3041 102.20 1982 0.0455 106.40 5766 0.1324 110.60 955I 0.2193 114.60 13335 0.3061 102.30 2072 0.0476 106.50 5856 0.1394 11Q.70 9691 0.2213 114.90 13425 0.3082 302.90 2162 0.0496 106.60 5947 0.1365 110.80 9731 0.2234 115.00 "�_3515 0.3103 102.50 2252 0.0517 106.70 6037 0.1386 110.90 9821 0.2255 115.10 13605 0.3123 142.60 2343 0.0538 :06.90 6127 0.1407 111.00 9911 0.2275 115.20 13695 0.3144 102.70 2433 C.O558 106.90 6217 0.1427 111.10 10001 0.2296 115.30 13785 0.3165 1C2.80 2523 0.0579 167.�0 6307 0.1548 111.20 10091 Q.2317 115.40 13875 0.3185 iC2.90 2613 0.0600 107.10 6397 0.1469 111.30 10181 0.2337 115.50 13965 0.3�06 103.00 2�03 0.0621 107.20 6487 0.1489 111.40 10271 0.2358 115.60 14056 0.3�2� 103.10 �793 D.0641 107.30 6577 0.1510 111.50 10361 0.2379 11�.70 1�196 0.324"� 103.20 2BB3 0.0662 107.40 6667 0.1531 111.60 1Q452 0.2399 115.B0 14236 C.32E8 103.30 2973 0.0683 107.50 6757 0.1551 111.70 10542 0.2420 115.90 14326 0.32�5 103.40 3063 0.0703 107.60 6848 0.1572 111.80 10632 0.2441 116.00 144i6 0.33(i4 103.50 3153 0.0724 107.70 6936 0.1593 111_90 10722 0.2461 11E.10 15506 0.3330 103.60 3244 C.Q795 107.8D 7028 0.1613 112.00 10812 0.2482 116.20 14596 0.335: 103.�0 3334 0.0765 107.90 7118 0.263i 112-10 10902 0.2503 i16.30 19686 0.3372 103.80 3924 0.0786 lOB.00 7208 0.1655 112.20 10992 0.2523 116.90 14776 0.3392 103.90 3514 0.0807 lOB.10 7298 0.1675 112.30 1i082 0.2544 116.50 14966 0.39:3 104.90 3604 0.0827 108.20 7388 0.1696 :12.40 11172 0.2565 116.60 14957 0.3434 109.10 3694 0.0848 108.30 7478 0.1717 112.50 11262 0.2586 116-70 15047 0.34�5 6/14/06 10 : 23 : 0 am RN Parnell Company page 2 KRISTEN WOODS WEST BASIN --------------------------------------------------------------------- ----------------------------------------------------------------- STAGE STORAGE TABLE STAGE <----ST'ORAGE----> STAGE <----ST'ORAGE----> STAGE <----STORAGE---> STAGS <---STORAGS----> (ft; ---cf--- --Ac-Ft- (Et) ---cf--- --Ac-Ft- {ft) ---cf--- --Ac-Ft- (ft) --cf--- --Ac-Ft- 116.80 15137 0.3475 11B.20 16398 0.3765 119.60 17660 0.4055 121.00 18921 0.4344 116.90 15227 0.3496 11B.30 16988 0.3785 119.70 17750 0.4075 i22.10 19011 0.4364 117.00 15317 0.3516 118.40 1b578 0.3806 119.80 17840 0.4095 121.20 19101 0.4385 117.10 15407 0.3537 118.50 16668 0.3827 119.90 17930 0.4116 121.30 19191 0.4406 117.20' 15497 0.3558 118.60 16'159 0.3847 120.00 18020 0.4137 122.40 19281 0.4426 117.30 15587 0.3578 118.70 16849 0.3668 120.10 18110 0.4158 121.50 19371 O.S947 ]17.40 15677 0.3599 118.80 16939 0.3869 120.20 18200 0.4178 121.60 19462 0.4468 117.50 15767 0.3620 118.90 17029 0.3909 120.30 18290 0.4199 121.70 19552 0.4488 117.60 15858 0.3640 1i9.00 17119 0.3930 120.40 18380 0.4220 121.80 19642 0.4509 117.70 -5948 0.3661 119.10 17209 0.3951 120.50 18470 0.4240 121.90 19732 0.4530 117.80 16038 0.3682 119.20 17299 0.3971 120.60 18561 0.4261 122.00 19822 0.4551 117.90 16128 0.3702 :.9.30 17399 D.3992 i2U.70 1865'_ 0.4262 :22.00 19822 0.4551 ' 119.00 16218 0.3723 119.40 17479 0.4013 120.80 :874; 0.4302 118.10 16308 0.3714 119.50 17569 0.4033 120.90 18831 0.4323 - - __-I _.� � v 6/14/06 9 :47 :41 am RN Parnell Company page 1 KRISTEN WOODS WEST BASIN LEVEL POOL TABLE SUMMARY MATCH =FFLOW -STO- -DIS- <-PEAK-> OIJTFLOW STORAGE c--------DESCRiPTION-------> (cfe) (cfs) --id- --id- <-STAGE> id (cfe; VOL (cf1 a�:�a==�=a�'s�"�:�___�='=�z==� \='s......z�===a'===='_'===.a...ea..�.......a.a. WEST - 002 YR ................ O.OG�� 0.74 WES't-VLT WEST-ORF 107.94 4 0.06 7156.98 cf WEST - O10 YR ................ , D.19 �� 1.20 WEST-VLT WEST-ORF . 5 0.19 8186-24 cf WEST - 100 YR ................ � 0.41 �� 1.73 WEST-VLT WEST-ORF 109.94 6 0.39 8957.60 cf X � ? - l�(,�fs �f J r� � ' �- � �' � ��- �� .� j � �� ' �� -o �= � � � �,� � � � �� j ��3.� � � �r� `tG� � � �3 � � . J �( � �/ '� �� X 6/14/06 9 :46 : 0 am RV Parnell Company page 1 KRISTEN WOODS EAST BASIN DISCHARGE STRUCTURE LIST MULTIPLE ORIFICE ID No. EAST-ORF Description: EAST VAULT - CONTROL VAULT Out 1 et �ev: ]�8�9-:'QO �j�a�� Elev�j�l�v �18�r90 ft Orifice Diameter: 0 . 6250 in. Eley�,.08 . 00 ft Orifice 2 Diameter: 2 . 2500 in. MULTIPLE ORIFICE ID No. WEST-ORF �j� Description: WEST VAULT - CONTROL VA T 3�J y� � Outlet Elev: l�-�-9�9 �� :3�� 2�� Elev:��ll. ft Orifice Diameter: 0 . 8750 in. d� 3� Elev�cjc� . t Orifice 2 Diameter: 2 . 1250 in.�- 'Z-� Elev: 109 . 10 t Or' fice 3 Diameter: 2 . 5000 in. Z�o`� � ��,�. . . .; r � � � � � � S� Z5z -f , �� V Z 1�1 N � � � Z � � � �� a � m � �- � � a W I J 6/14/06 10 :43 : 54 am RN Parnell Company page 1 KRISTEN WOODS EAST BASIN BASIN SUMMARY � BASIN ID: EX-E-002 NAME: EXISTING EAST BASIN - 2YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . I8 Acres BASEFLOWS : 0 . 00 cfs R.AINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 1 . 18 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 76 . 00 0 . 00 TC_ . . . : 41 . 70 min 0 . 00 min ABSTRACTION COEF�'� 0 .20 TcReach - Shee�_ �: 234 . 00 ns : 0 . 8000 p2yr: 2 . 00 s : 0 . 1500 PEAK R.ATE: 0 . 0�'cfs VOL: 0 . 04 Ac-ft TIME: 760 min �" BASIN ID: EX-E-010 NAME: EXISTING EAST BASIN - lOYR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 18 Acres BASEFLOWS : Q . 00 cfs RAINFALL TYPE . . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 1 . 18 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 76 . 00 0 . 00 TC. . . . : 41 .70 min 0 . 00 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 234 . 00 ns :0 . 8000 p2yr: 2 . 00 s : 0 . 1500 PEAK RATE : 0 . 12 •cfs VOL: 0 . 09 Ac-ft TIME : 490 min BASIN ID: EX-E-100 NAME: EXISTING EAST BASIN - 100YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 18 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 1 . 18 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 76 . 00 0 . 00 TC. . . . . 41 . 70 min 0 . 00 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 234 .00 ns : 0 . 8000 p2yr: 2 . 00 s : 0 . 1500 PEAK RATE: 0 .25 cfs VOL: 0 . 16 Ac-ft TIME: 490 min �I 5/14/06 10 :44 : 12 am !�N Parnell Co�pany page 1 KRISTEN WOODS EAST BASIN BASIN SUMN'ARY BASIN ID: DV-E-002 NAME : DEVELOPED EAST BASIN - 2YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 18 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 53 Acres 0 . 65 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC . . . . . 7 .33 min 7 . 33 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s :0 . 0200 TcReach - Channel L: 185. 00 kc :42 . 00 s : 0 . 1200 impTcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : o . 0200 impTcReach - Channel L: 185 . 00 kc :42 . 00 s : 0 . 1200 PEAK R.ATE : 0 .41 cfs VOL: 0 . 13 Ac-ft TIME: 480 min BASIN ID: DV-E-010 NAME: DEVELOPED EAST BASIN - lOYR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 18 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0 . 53 Acres 0 . 65 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . : 7 . 33 min 7 . 33 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 50. 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0200 TcReach - Channel L: 185 . 00 kc :42 . 00 s: 0 . 1200 impTcReach - Sheet L: 50 . 00 ns : o . 1500 p2yr: 2 . 00 s : 0 . 020G impTcReach - Channel L: 185 . 00 kc :42 . 00 s : 0 . 1200 PEAK R.ATE : 0 . 66 cfs VOL: 0 .21 Ac-ft TIME: 480 mir_ BASIN ID: DV-E-100 NAME: DEVELOPED EAST BASIN - 100YR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 18 Acres SASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 .53 Acres 0 . 65 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 7 . 33 rnin 7 . 33 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0200 TcReach - Channel L: 185 . 00 kc : 42 . 00 s : 0 . 1200 impTcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0200 impTcReach - Channel L: 185 . 00 kc :42 . 00 s : 0 . 1200 PEAK RATE : 0 . 95 cfs VOL: 0 . 31 Ac-ft TIME : 480 min 6/14/06 10 : 22 : 18 am RN Parnell Company page 1 KRISTEN WOODS EAST BASIN STAGE STORAGE TABLE RECTANGULAR VAULT ID No. EAST-VLT Description: EAST VAULT Length: 30 . 00 ft . Width: 17 . 00 ft . voids : 1 , 000 STAGE <----STORA6E----> STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> (ft) ---cE--- --Ac-Ft- (fU ---cf--- --Ac-Ft- ;ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- � 100.00 0.0000 0.0000 104.20 2142 0.0492 108.40 4284 0.0983 112.60 6426 6.1475 100.10 51.000 0.0012 104.30 2193 0.0503 108.50 4335 0.0995 112.70 6477 0.1487 �. 100.20 1C2.00 0.0023 :D9.40 2244 0.0515 108.60 4386 0.1007 112.80 6528 0.1499 ' 100.30 153.00 0.0035 104.50 2295 0.0527 108.70 4437 0.1019 112.90 6579 0.1510 :00.40 204.00 0.0047 104.60 2346 0.0539 108.80 4488 0.1030 113.00 6630 0.1522 100.50 255.00 0.0059 104.70 2397 0.0550 108.90 4539 0.:092 113.10 6681 0.1534 100.60 306.00 0.0070 104.80 2448 0.0562 109.00 4590 0.1054 113.20 6732 0.1545 100.70 357.00 0.0082 109.90 2499 0.0574 109.20 4641 0.1065 113.30 6783 0.1557 100.80 408.00 0.0094 105.00 2550 0.0565 109.20 4692 0.1677 113.40 6839 0.1569 100.90 959.00 0.0105 105.10 2601 0.0597 109.30 4743 0.1089 113.50 6885 0.1581 i01.00 510.00 0.0117 105.20 2652 0.0609 104.40 4794 0.1101 213.60 6936 0.1592 101.10 561.00 0.0129 105.30 2703 0.�621 109.50 4845 0.1112 i13.76 6987 0.1604 101.20 612.00 0.0140 105.40 2754 0.0632 109.60 4896 0.1124 113.8G 7038 0.1616 101.30 663.00 0.0152 105.50 2905 0.0644 109.70 494� 0.1136 i13.90 7089 0.1627 101.40 714.00 0.0164 105.60 2856 C.0656 109.80 4998 0.1147 :14.00 7;40 0_1639 101.50 765.00 0.0176 105.70 2907 6.0667 109.90 5049 0.1159 114.10 7191 0.1651 101.60 816.00 0.0187 105.80 2958 0.0679 110.00 5100 0.1171 114.20 7242 0.1663 101.70 867.00 0.0199 105.90 3409 0.0691 110.10 5151 0.1183 119.30 7293 0.1674 301.80 918_OC 0.0211 106_00 3060 0.0702 110.20 5202 0.::99 114.40 7344 0.1686 101.90 969.00 0.0222 106.10 3111 0.0714 110_30 5253 O.i206 114.50 7395 0.1698 102.00 1020 0.0234 106.20 3162 0.0726 110.40 5304 0.1218 114.60 7946 C.1709 102.10 10�1 0.0246 106.30 3213 0.0738 110.50 5355 0.1224 114.70 7497 0.1721 102.20 1122 0.0258 106.40 3269 0.0749 110.60 5406 0.1241 114.80 7548 Q.1733 102.30 1173 0.0269 106.50 3315 0.0761 110.70 5457 0.1253 114.90 7599 0.1744 102_40 1224 0.0281 106-6D 3366 O.D773 110.84 5508 0.1264 115.00 7650 0.1756 102.50 1275 0.0293 106.70 341'7 0.0784 110.90 5559 0.1276 115.10 7701 0.1768 102.60 1326 0.0304 106.60 3468 0.0796 i11.00 5610 0.1288 115.20 7')52 0.1780 102.70 1377 0.0316 106.90 3519 0.0808 111.10 5661 0.1300 115.30 7803 0.1791 102.80 1928 0.0328 107.00 3570 D.0820 111.20 5712 0.1311 115.40 7854 0.1803 102.90 1979 0-0340 107.10 3621 0.0831 111.30 5763 0.1323 115.50 7905 0.1815 103.00 1530 C.0351 167.20 3672 0.0843 111.90 5814 0.1335 115.60 7956 0.1826 103.10 1581 0.0363 1G7.30 3723 0.0955 111.50 5865 0.1346 115.70 8007 0.1838 103.20 1632 0.0375 107.40 3774 O.OB66 11:.60 5916 0.1358 115.80 BO58 0.1850 103.30 1683 0.0386 i07.50 3825 0.0878 111.70 5967 0.13'70 115.90 Bi09 0.1862 103.40 1734 0.039B 107.60 3676 O.C890 i11.80 6018 0.1362 116.DD 9160 D.1873 103.50 :785 0.0410 107.70 3927 0.0902 111.90 6069 0.1393 116.10 6211 0.1885 103.60 1836 C.0421 107.80 3978 0.0913 112.00 � 6120 0.1405 116.20 8262 0.1897 103.70 188? O.Q433 107.90 4029 0.0925 :12.10 6171 0.1917 116.30 8313 0.1908 103.80 1938 0_0445 108.00 4080 0.�937 112.20 6222 0.1428 116.40 8364 0.1920 103.90 1989 0.045� 1O6.1C 4131 0.0998 1':2.30 6273 0.149C 116.50 8415 0.1932 104.00 2090 0.0968 108.20 4182 C.0960 112.40 6324 0.1452 1'_6.60 8466 0.1944 iO4.10 209? o.oaao 108.30 4233 D.�972 112.50 63"/5 0.1963 116.70 8517 0.1955 6/14/06 10 : 22 : 18 am RN Parnell Company page 2 KRISTEN WOODS EAST BASIN ------------------------------------------------------------------ ----------------------------------------------------------------- STAGE STOtZAGE TABLE STAGE <----STO?AGE----> STAGE <----STORA6E----> STAGE <----STORAGn----> STAGE <----STO.riI�Gn----> !ft) --cf-- -Ac-Ft- (fti ---cf--- --Ac-Ft- (ft) --cE-- --Ao-Ft- (ft) ---cf--- --Ac-Pt- 116.80 856H 0.;967 119.20 9282 0.2i3i 119.60 9996 0.2295 121.00 10710 0.2959 lIo.90 8619 0.1979 11B.30 9333 0.2143 119.70 10047 0.2306 121.10 10761 0.2470 11"1.00 8670 0.1990 118.40 9384 0.2154 119.80 10098 0.2316 121.20 10812 0.2482 _17.10 8721 0.2002 118.50 9435 0.2166 119.90 10149 0.2330 121.30 10863 0.2494 :17.20 8772 0.2014 118.60 9486 0.2178 120.00 1C200 0.2342 121.90 10919 0.2506 :17.30 8823 0.2025 118.70 9537 0.2189 120.10 10251 0.2353 121.50 10965 C.2517 =:7.40 8874 0.2037 118.80 9588 0.2201 120.20 10302 0.2365 121.60 11016 0.2529 117.50 8925 0.2049 118.90 9639 0.2213 120.30 10353 0.2377 121.70 11067 0.25a1 117.60 8976 0.2061 119.00 9690 0.2225 :20.40 F0404 0.2388 121.60 11118 0.2552 :17.70 9027 0.2072 119.10 9741 0.2236 120.50 10455 0.2400 121.90 11169 0.2564 1_�.80 9078 0.2084 219.20 9792 0.2248 120.60 10506 0.2412 122.00 11220 0.2576 117.90 9125 0.2096 119.30 9843 0.2260 120.70 10557 0.2a24 122.00 ':_220 0.25�6 118.00 918C 0.2107 119.40 9894 0.2271 120.80 10608 0.2435 1-6.10 9231 0.2119 119.50 9945 0.2283 12C.9G 10659 0.2a47 6/14/06 9 : 58 : 9 am RN Parnell Co�pany page 1 KRISTEN WOODS EAST BASIN LEVEL POOL TABLE SUMMARY MATCH INFLOW -STO- -DIS- <-PEAK-> O'JTFIAW STORAGE c---- —-DESCRIPTION-—-—---> (cfe) (cfa) —id- --id- �-STAGE> id (cfS) VOL (cE) e^•AST - 002 YR ................ 0.�3 0.41 EAST-VLT EAST-ORF 107.99 1 0.03 4073.99 cf EAST - O10 YR ................ 0.:2 0.66 EAST-VLT EAST-ORF 106.46 2 0.13 4324_56'�e.f EAST - 100 YR .. .............. 0.25 0.95 EAST-VLT EAST-ORF ]rA7�C� 3 0_21 '4941.76 c� � �.3 32°0•� 'Yz:� �r ✓ 6/14/06 9: 45 : 50 am RN Parnell Company page 1 KRISTEN WOODS EAST BASIN ________________________________________�____--_-____________________ STORAGE STRUCTURE LIST RECTANGULAR VAULT ID No. EAST-VLT Description: EAST VAULT Length: 30 . 00 ft . Width: 17 . 00 ft . voids : 1 . 000 RECTANGULAR VAULT ID No. WEST-VLT Description: WEST VAULT Length: 53 . 00 ft . Width: 17 . 00 ft . voids : 1 . 000 � l7� /? .� C�rS. (/c.�c-�'' �/�5: i/�UL T Ci�LGL)G�A7F� _ � � C/f��'��:�� / v.irf.�/s.cr,x _ /7 XS�.�X/C! - /7 X jO',t' /o niyxN s.�� (4c��.�FrE'� �,stcv�.s:c=v �o��,y¢ % /�', �in�-:. - �, ic��.r. z/o��,..� � ��`l r _ /. � .� 7 /`�:.- �.9%-�,-y �-;n.�z " /� �� l-`�'C+A/ �cc�"+t.= _ //, 7/J �'.f, � �=:,,��• 1��:.,�,,, �' .l- 30�.�. l�rx�-✓ , � �5�1' v /��XY � �..�f-+�Sia�w� � i�X��'�' X� ��7 �' k•o' �/aN�•✓5/o.ro� N'orr•� /7� ��v5.�- �v.a�%-,� ��rl- ' /'��Ic's..�l «�.�Tti L,Sc= /�' <`''`'�' c:l�?�.t/Fss G��; ��•' G��,vl c.r7�°9.vlys ,. � TED - 40 - 3339 _. ' aniereNw000srur, ' � P��OA of 10:. . - ----- � RSpN h�SSOG. ��a�. ,.,g�,b9,1p«, � CITY �r' KRISTEN WOODS LUA05-056� o�/�z/aooa �woc -- ' ___ o�a � RENTON, WAS INGTON - - --- ---- — � � --- .� RENTON ' "'" ' DAT11 ROAD&STORM "' "' "' -" -" � �—� PionNng/BufiOmg/PubGc WOMi U�pl. N0. 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