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HomeMy WebLinkAbout02971 - Technical Information Report - Drainage � �. � � .1AECER ENGINEERING 9419 S. 204 Pu►CE - KEr�tT, WASHINGTON 9SO3 1 PHONE (253) 850-0934 FAx (253) 850-0155 Q - �-�'� l October 12, 2001 �P��2rn 2��' ��o/o Z. DRAINAGE REPORT JACQUES tiNION AVE. SHORT PLAT 5 LOTS 2211 U\ION A��. �1E RENTON, �'VA. PREP!-�RED FOR: Jim Jacques 25Q9 Aberdeen Ave. NE Renton, WA. 98056 _ �,�,�y� (425) 255-2362 -�'��' ��'G, �.,� �' � ��'` ���:. � a�+�,�,��, � , �'�� • �; -'•. �4 d: . '�� PREPARED BY: .��. �� f '�► �` ���i ' � James J. Jaeger, P.E. �' }�C�s�,c,;� �,, . �r�,�qAL��.'°�0��o t ���;�.�,"� �r„��J ZooZ ��� U�2.�• ?���O�p 2 � 297/ • A J {�GQv ES �JI.LIO tJ S� � . ��s� � Rs i t� bRd�� r� r��� _ A� PRE D����;�P�D ' � � l��` - ( s-t- I -"� �o c� = 1�� S� - � ,3 Z �c Z 2 . C�,w-e. N�Y�.E3� '. Pz�� �'�1 t o�s , �i{�� = g� ( T'�l@��w o r ��J 3 . Tm� P= c��,f�-�t �n . 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I � O q\ � „ 1 � ,--_ � � I \ f J � `� I LEGEND: LEGF.ND� (CONT) � Q � A � � „��,4.,��,��.., o u,G,�, d <��► W � I o�7d /DI/O f/�CO�KI�M7W Af 40MM � UR/�1'Ibll � J � �-�,, �' I � .uI a,�,b�.,� � c� ��K O (• �0' I� • Y7!/11�IKMR AMD GM LS 71lJ7 � �� 01 �M�U�wlK _ C� I O ra.w�cs+�w r�c�s v�o.n � wua �cttr �� � - - - x na�aat ro.n j� nrc rnoRwr -� �cow+[wo�s rntr e st.0 r.vaxt _ � � � � � 'n � OCCOLOI/S �(L C// m�GT 0�MK1W� V I II/M I�'O/I-Q�-IMY II � � \ � T�rY V � I Jaeger Engineering JACQUES UNION SHORT PLAT EAST BASIN HYDROGR.APH SUMMARZES PREDEVELOPED AND DEVELOPED 100 YEAR PEAK FLOWS BASIN SUMMARY BASIN ID: E100D NAME: EAST BASIN, DEV. , 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 20 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 07 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 8 . 31 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 13 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 90 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0440 PEAK RATE : 0 . 14 cfs VOL: 0 . 05 Ac-ft TIME : 480 min BASIN ID: E100P NAME : EAST BASIN, PREDEV. 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 32 Acres BASEFLOWS : 0 . 00 cfs R.AINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 32 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 00 TIME OF CONC. . . . . : 13 .49 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 00 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 145 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0340 PEAK RATE : 0 . 15 cfs VOL: 0 . 06 Ac-ft TIME : 480 min _ , . File Basin Hydrograph Storace Discharge Level pool =�ee5eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ; eeeeeeeeee ; E � SF:EET FLOW CALCUI�TOR - INITIAL 300 FEET ° o o� o � o ' °DES°Mannings Sheet Flow. . . . . : 0 . 1500 ° ° �, 0 o g o 0 ARE Flow Len th (ft) . . . . . . . . : 145 . 00 H ICES � �RAI°2 yr 24 hr rainfall (in) : 2 . 00 ° ° °TIN°�and Slope (ft/ft) . . . . . . : 0 . 0340 ° ° -' OTIM° COMPUTED TR.AVEL TIME (min) : 13 . 49 ° ° °.�' Io TYPICAL MANNINGS VALUES FOR INITIAL 300 FT °A ° °ABS° o 0 °BAS°Smooth Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 011 ° ° °STO°Fallow Fields of Loose Soil Surface . . . . . . . . . . . . . . : 0 . 05 °y ° ° °Cultivated Soil with residue cover {s<=0 . 2 ft/ft) : 0 . 06 ° ° °PER°Cultivated Soil with residue cover (s>0 . 2 ft/ft) . : 0 . 17 ° � °ARE°Short prairie grass and lak�ns . . . . . . . . . . . . . . . . . . . . . 0 . 15 ° ° °CN °Dense grasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 24 0 ° 0 oBerinuda grass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 41 ° ° � oRange (natural) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 13 0 . °P�A°w,00ds or forest with light underbrush. . . . . . . . . . . . : 0 .40 ° � °�EA°�'oods or forest with dense underbrush . . . . . . . . . . . . : 0 . 80 ° °TOTo 0 o °F10F�:ey: QUIT FSKey: CLEAR °ete ° ° Pgaeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeefit Qeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee��=��������=e�=� PR� - c%F��.� ,��� T� _ �- rile Basin Hydrograph Storage Discharge Level pool �eeE5eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ; eeeeeee�ee ; o ° SHEET FL0�9 CALCUI:�TOR - I?�'ITIP_L 300 FEET o ° 0 0 0 0 °DES°I�annings Sheet Flow. . . . . : 0 . 1500 ° ° °�RE°Flow Length (ft) . . . . . . . . : 90 . 00 °HOICES ° °:iAI°2 yr 24 hr rainf al l (in) : 2 . 00 ° ° °Ti?�°Land Slope (ft/ft) . . . . . . : 0 . 0440 ° ° °TI'✓° COMPUTED TRAVEL TIME (min) : 8 . 31 ° ° °FcAI° TYPICAL MANNINGS VALUES FOR INITIAL 300 FT °A ° °i'��s° o 0 °BAS°Smooth Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 011 ° ° °STO°rallow Fields of Loose Soil Surface. . . . . . . . . . . . . . . 0 . 05 °Y ° ° °Cultivated Soil with residue cover (s<=0 . 2 ft/ft) : 0 . 06 ° ° °P�R°Cultivated Soil with residue cover (s>0 . 2 ft/ft) . : 0 . 17 ° ° °ARE°Short p.rairie grass and lawns . . . . . . . . . . . . . . . . . . . . . 0 . 15 ° ° °CN °Dense grasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 24 0 ° � oBermuda grass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 .41 � o o �Range (natural} . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 13 0 0 °FEA°�'oods or forest with light underbrush. . . . . . . . . . . . : 0 .40 ° ° °PEA°R'oods or forest with dense underbrush. . . . . . . . . . . . : 0 . 80 ° ° °TUTo 0 0 ° OFlOKey: QUIT F5Key: CLEAR °ete ° ° Pgaeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeefit ° aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeEe � � ���,.��d '� � _ • . . � KING COUNTY, �' ASHING 'TON, SURFACE WATER DESIGN MANUAL 1.2.1 CORE RE�UIREMENT �C1: DISCHARGE AT THE NATURAL LOCATION ' All surface and storm water runoK from a proposed project that proposes to construct new, or modify existinp drainape facilities must be discharped at the natural location so as not to be diverted onto, or away from, the adjacent downstream property. Proposals which do not discharpe at the natural location in order to address an existinp or anticipated problem will be considered as a variance (see Section 1.4). Discharpe from the proposed project must produce no sipnificant adverse impact to the drainape system of the downhill property. Where no conveyance system exists at the adjacent downstream property line and the discharpe was previously unconcentrated flow, any concentrated runoff must: (1) be conveyed across the downstream properties to an acceptable discharpe point (see Core Requirement A'2: Off-Site Analysisl, with drainape easements secured from the downstream owners and recorded at the Kinp County Office of Records and Electi�ns prior to drainape plan approval, OR (2) be discharfled onto a rock pad shaped in a manner so as to disperse flow if the runoff is less than 0.2 cfs peak runoff rate discharped from the site for the 100-year, 24-hour desi�n storm event, OR f3) be conveyed to a dispersal trench (see Fipure 4.3.6B) or other infiltration system if the runoff is less than 0.5 cfs peak runoff rate discharged from the site for the 100-year, 24- hour design storm event, provided the applicant can demonstrate that there will be no sipnificant adverse impact to the drainage system of the downhill property. � I i � � � 1.2.1-1 11192 I - ,