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HomeMy WebLinkAbout02998 - Technical Information Report - Geotechnical .�AEC ER ENC INEERING 9419 S. 204 P[.ACE - KEN'�', WASHINGTON 98031 PE-tor�E (253) 850-0934 Fax (253) 850-0155 � � N � November 20, 2003 � 2 � �� tr�� DRAINAGE REPORT JAY HILL SHORT PLAT 4 LOTS 766 MONROE AVE. NE RENTON, WA. � ,: PREPARED FOR: „�#��- `��•�a 1 ����5. ...y� � Jay Hill � ,�`� . 12617 SE 96`� Place � k �� �� �3 �� . �. ,. Renton, WA. 98056 � �:`� ��� /\`�3 `��a��1���y^ �t � � ... - . - «M ,�.� M_r.... -� --.. ; PREPARED BY: __ . _�_..,_,_.. James J. Jaeger, P.E. ,; ..� ,.�,, RECEIV � �� NOV Z 5 Z�;, � � � � % � � :�� � �,u����ir�u �;v�s�,�r� ` All of the lots will be able to have a gravity connection to both the sewer and storm drainage systems. The proposed drainage will be collected by the thickened edge curb. The runoff f�om the private road will routed to a biofiltration swale between the road and the north property line, and then into new cotch bosin near northwest corner. This catch basin will be piped to another new catch basin and then into an existing catch basin in the east gutter of Monroe Ave. NE. The new houses will have roof downspout drains that are connected to o collection pipe within the private street. The rear yard drainage from the new lots will generally sheet flow towards the south properfy line where the existing site runoff is going. The site soils are of #he Arents, Alderwood series as mapped by the SCS soils survey. ! . Page 1 of 2 - King Couniy Bullding and Land Development Dlvislon TECHNICAL INFORMATION REPORT (TIR) WORKSHEET . - . . . . . �- r - . � c,� ��- . � � �-+ • • Project Owner �0.v ���� Project Name a cr-i Address ��-lp �� �(�� �,- . Location ��" ; ' Phone ��^ l.�o.• °C��s Township �-3 � Project Engineer Rar'9e s� Company ,� �,r, Section � ,� , � Project Size �.(9q AC '�____G _ ; � Address Phone ' � � Upstream Drainage Bas;n Size n AC � , --, , a� _ , �- � � � . • �• � � . . i�- • �- �� i (� SuSdivision � DOF/G HPA C) Shore'ine�:Sznagerne;�; � � ' Sho�t Subcivision i � �I COE 40a u R�a:ery I �Gradir,g i ! ; � 2{ , � Structural V2u�;s , � C DOE Da S ey ;' Cj Commercial I ! O FE��1A Floodplain � O:her ' �1 Other � '�1 C O E ti'Jella�ds 0 HPA .• i � �� � -i Co�-'�'�uri:� '� ���( O� ���.�� t� Dra:r,a�e 6asin _�-��- �.�3��-f ! �� '� '�N-- - - ---- � .� �; River - -- �. r=:oCti�'c;^ -- - --- - ._1 S,ream — ��Je�lands _---- --—_ � Crilical Siream Re2ch �' Se�psJSprings iu pepressior,s�S��a'es �� HighGroundwaterTable ; C' Lake � Grourd���ater Rechar5e � S'eep Slopes -------- --- ^ Other ___ Lakesice E�cs�� H��-c � F-• �� �.�� - . .. . . -�,Yi_i '��? 1[� �a J: o k"'1,:.'�� ��5� � �i. �'y s'Ly'�l - �4._=: T , �.. _., �" �� ��.�i,� � 1.�.� — �.�..=� L.�Ori� Cl,� ^II_�I _ . .._. — �.-...:���2������I��<< r- _ ����. , L c —J _ ,. �mTs, ���-ru�.� _0. l6-'. 5 �� __ d.�v-�"z- S f�'�t- -���m)----- ---- ----------- _ . I'�G'G�Ii�CiriGi J�'�E�S r.��G��'�.C.ri . .\ � " Page 2 of�. . � King County Buliding and Land Development Division � TECHNICAL INFORMATION REPORT (TIR) WORKSHEET � a • • ��i� �� . REFERENCE LIh41TATIOWSfTE CONSTRAINT � � Ch.4- Downstream Aratysis _� �1 P.� �O 'e�'�l� C.� 1 Yl � QYl�� S� � a a 0 � Addilional Shaets At;alched , •� . I•,���i� MINIMUM ESC REQUIREMENTS MINIMUt�1 ESC REQUIREMENTS ', DURfNG CONSTRUCTION FOLLOWING CONSTRUCTlON � 0 Sedimentation Faalities Stabflize Exposed Surface ( � Siabifized Constr�ction En,ra�ce � Remove and Restore Temporary ESC Fadii?ies ' �Perimeter Runoff Control �Ciean and Remove Atl Silt a�d Debris ' Clearing and Grading Res;nctions �Ensure Operation of Permanent Fadlities � . � Cover Prac��ces 0 Rag Umits oi NGPES � l� Construction Sequence � Other . 0 Other � � i-, • « �• �. I � C`c55 LI'lEC C�'�c^�''�E� r- I c'lh ,_�� ir�.ifc;l:,r �.iE;;"���C�n".c�j515 ' � Pipe System � Vault � Depression �S U E-�i '� � � Open Char�^el !: Enercy Diss�x'�r � Flow D:s�ersal Compensaticn:?,!�tiga;:on �, i� Dry Pond U YJe;,a�d � Waiver of Eli�mif ated Si;e Slorage � Wet Pond 0 Siream � Regional Detention ������-' ' Brief Descri�tion cf Sys?em Opera'icn �p� 1'v�D'TT "`'O q,e„)tiP_.r `�'�¢J,n '�-i� �l0'i �I• S w�. , -�-�n�. T a c-8 o�r.d � e k►s�" ��e e�' s�r�e m Facility Related Site Limitatior:s (� Addilienal Shee;s tit;�tched Feference Fa;:i:,y Lir-i;a;ion � i �C�'nQ- �� �� �� --�� _, _�'� � ,r ^• : V• �Dr2inaoe Easement I � C�s;in Place Vau!1 � O;��er i � �, Access Easement 0 Ret�ininq Wa!1 C Nativo Gro�ti�th Pro;ection Easemer;l � � Rockery>4'H�y.7 � Tr�ct � Structural on Ste-e�Slope i i � O:ner _ ___ - • � c, -� . -.. -�� . �-i i»- , II or a civil engineer urder my supervisicn have visited the site. AC,ua( , site condiUons as cbserved wero incorporated into this worksheet and the ��0� arialchments. To L*e best of my kncv+�edge the intormation provided �here is accvrate, s ��.�. , . , PUGET SOUND �� . � � �,i i , rv�r � ---��„_i � __._ _ _— — — � - — — — -- --.__ . � N r-i N M � , ��r^� I�vl ". �� � . - . _ x� . �.�,i � �S ^ , � ..�•�1V ��l j� .. � ^ � � � � _ __-.-.•_-_ 41 .. � 1 � YI [:�i 15 ..I �;I f. it ��ie�i��'.. �t%� ` Y � i � J � '''' �r y � y ' . ___ I , ,'w..--r.-r -- ------ - ---- � �„ � � . y . � c: � nr �u��i I �. 6O ��. f �'j��n .., f. 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I�E lt '' 1 '--.=a,; -- - �� . � °'�� - s° � �4 • � �-�� , � „ _� �. � � �NE 11 th -P� ,� �� � � ��,4 �, �,; � , S �'� � I � , r 6n. } � - 1 4� „�; '� ' ,ea� f� "-ioeo� � '�d r i i , � �- 8"_`—�4 , `_ ;��._. ; ;� �NE; 11�h St.� ,� �,�i - - : o -NE l l th ,�.. �f---- i � ; � - - �-- � , � ,� I � ,� ��- ._ � � " , � +eee �i . � _ �a'°� _ : . _'°'�, _ , � -- _ 6 - �, �l 6 ��„�, � _ � , NE� lOth Pl., fin � � -- ,� ,�,; - , , , � � ----- - - _ - , , , � _ t � ,! 8�� 6 s�4 �— , '; x� - , --- ,-_- � � - - ��0° r `- - � - - - __ ._ _ � - - - - Q' 4 . �,,__ O °i:_ i ,t � - --- - � �. NE 1 th Ct`�_ _-� . _ �, . � � - � ,� - � �- -� � ^ , � _ � . _ --- � -�--7° _._�_..� ,, ; 6�; ,oa� ,- _�; '� �_6 ,p+a — �-- - _. ! t95S � l-- , —� , r _� " ��a - - ` -� -- - � -8�, -- - - . - -- -- NE;-� 1�Ot��' i�r�. ;� - . . - � i- , � � � � - `z. —; "„__. ,�. • - W - 6 ; ; � � - ; _ � ,an8...--��- - ,es, � - Z -- , ,-__ ., . n�1� 1 ' �(\'`�lr l,oia -- - �„ � � "_J \ ^ 1\L 110��1' 1✓l,•i . . _ : t �-� -�$—�e t�t t�_� _._..�----�----t� � teoo � � — -„-�y�-, �,a�----_-- _----- -y-� � - - -,eo, j �'°at ;� 8 � , � 8 1 _ —_ N . - ; - 1 . __ _ ,_�at� �o? � �� , _ , � i � . NE 9t�i�. .�t: -- i i - y� mo� ----=�¢�1 "� _n , � �,��.. � , 1 � � N o� : = _ ��� � ; 8„ ,Q2s j i�� ,� � ��� � ,s3t; 8^�:t�i�1� �� _ : I e � _ o, �,� _o � ; _ � � __ �, � _ �� � NE 9 Ct.%� �- � °°- �� ' _ �--�1 j •Q,' ;� c:� i�, -:� I - ' ,� „ � �' � + 1 ' -_.�� i -C�, ' �;+; - ;; �. °� NE ; 9th Ct. ,. ; w _ �, ;-- o � 1 4 „ cy - ?; _ _ ; � __ .- �� ' .,� � --�. . __��� _ � � __ ,-�r 1 ; -� , , _ :� _,� �r � ;,C73 aa _ _ :. � _ 1 � ' ���- � - �� -- ,v,a's�' � ,�ts_� � � �l r� � � g�� ,r,�' � ��z � 8 +� --=---8 ,vn � I w --- - -- . = ---� --- � NE 8th Ct. � ' �rnt ---r�a---i� , -�v�a—��ta -- � 4 �. C W �,�• . � ' �_i _ - ; - �- � .r- � �,;-�'/ � E 8th- St. , - � , ; . , , � � a�► ., , T ..�- I � . --- � -- . T f-- � � � I I ,4C� � � g _- -- -� �__ � t714i r-�- �° � �. ,91� r.� , !� ; M � NE 7th St. � �,4-�_-,�, , ��__,-,� �_._--- � �� c�' � ;,�o.��, , -1 � N : �-.-_ -- - --- =-- --_.. � ,� : � NE 7th F � �� - , � - � ,� �� -,����;.�� --��� ' � ,�,;:.` �- � -�,.� � � - -- --- d' i _ . � - , ; ; � .;;� � ,_, ,-�o�--- ��---- _ o � . , � _ �� _ --- I � � � -� . . � �� � �� � � � � ; � .��_ - �._ _ : '__ ,� _� .o � �� -� � ! E 6�_ Ct �, . . A ,�,� - „� NE 7 th ,�P l. __,J�, � =_ � ; ``- `� »�a � --_�____--�-•- � ' :'��";� � i � �aat f --- ;�,� ,�, r�,�,---.----.�----� - �- �-� �� �,� � ; :NE „6th -F � � - . __� ► � � - __ � �-I NE 6th w , � % .� -°° --- �,�"� �� -_Pl:� - ,� �- _- � „ � � r'�°-�- � . � � s , � ��, -- .---,� , ; ; ����� 1738 -------�* .� ���b�+-- 3 `i�7p r�� I ; r. O { ;� � � Q�� I � � � ; I '� � ,�1 I � � - � - - -� y � � - , ' : ,�„� � �, � � 8„;� �NE 6th- t�-�� - ;- �� �--,� I -„ � � ' ,ns »e°_ _ ; , —,e�n t�iar�_'__ � ; � _8_ � .E�; a�1____ _��ro . i � � = ; �Et C�Z� , i �i-i i- ---,161t ��--r--...ta64----_---teD6 1 , ' O. ._ � _ •r--1 • i . 4i� i � � 1 1 ! . ' ' T_�� �/.-=�: ; oo W � p.�- . 6„ : ' I _,,i_ � ' " � „ , . _. � � - , rt—! „�a � � 8"� ----�-----�i__g_ , , -� . � �a7 �^ . �- � r-.� -- ; !t5�o:� --- --- ,- -_ `_. � � 1-� I • �' -j � k— �' � � � 1 O�� � yl �� i ���O — . - � O -- � _ ' I � E�- ?�4�=� 3J1 1770 � ���' t�SS I � - � 1 ; � ---- J , �t ...,e i . __ • II. CORE DRAINAGE REQUIREMENTS 1 . Discharge at Natural Location: The majority of the site will continue to discharge at the existing location. CuRently, approx. 1/3 of the site (0.22 acres including ail existing � impervious surfacesj sheet flows towards Monroe Ave. NE. The remaining �, 2/3 of the site (0.44 acres) sheet flows towards a low point along the south ! property line, approx. 100' west of the southeast properfy comer. The proposed development will have all of the new impervious surfaces (0.43 acres) being collected and piped to Monroe Ave. NE. The yard areas for lots 3 and 4 (0.21 acres) will continue to drain to the low point along the south properfy line. The yards for lots 1 and 2 will drain to the west and south. It is beneficial to re-direct the new impervious runoff to the existing drainage system in Monroe Ave. NE. There is no drainage system at the low point along the south property line and any runoff in that area flows onto the adjacent residential property. 2. Off-Site Analysis: An upstream and downstream drainage analysis has been performed and is detailed in section III of this reporf. 3. Runoff Control: This project is exempt from peak rate runoff control due to a negligible increase in the 100 year storm for the developed project when compared to the predeveloped 100 year condition. That 100 year difference is 0.49 - 0.32 = 0.17CFS. 4. Conveyance System: The project will provide conveyance piping for the roof downspouts for all 4 of the new lots. The piping will be sized to handle the 100 year developed storm event from the lots and from the road. 5. Erosion and Sedimentation Control Plan: An erosion control plan will be prepared and will be included with the engineering plans. This erosion control system will include silt fencing along the south property line, construction entrance, seeding 8� mulching and clearing limits. 6. Maintenance and Operation: The improvements to this site will remain private ond within private, joint use easements. Covenants will be recorded with the shorf plat that define the maintenance responsibilities. 7. Bonds and Liability: The bonding and insurance forms will be secured prior to any construction. � � � � '� � � v �,of Renton PB/PW Department Administrative Land Use Action REPORT AND DECISION DATED August 8,2003; PROJECT LUA-03-067,SHPL-A Page 7 ` H. Findings: Having reviewed the written record in the matter, the City now enters the following: 1. Request: The applicant has requested Administrative Short Plat Approval for the Jay Hill Short Plat, File No. LUA-03-067, SHPL-A. 2. Application: The applicanYs short plat application complies with the requirements for information for short plat review. The applicanYs short piat plan and other project drawings are contained within the official land use file. 3. Comprehensive Plan: The subject proposal is consistent with the Comprehensive Plan designations of the Residential Single Family(RSF) land use designation. 4. Zoning: The proposal as presented, complies with the zoning requirements and development of the Residential Single Family—8 (R-8)zoning designation, provided all advisory notes and conditions of approval are complied with. 5. Subdivision Regulations: The proposal complies with the requirements established by the City's Subdivision Regulations for the short platting of four lots provided all advisory notes and conditions of approval are complied with. 6. Existing Land Uses: Land uses surrounding the subject site include: North Residential Single- Family(zoned R-8); East: Residential Single-Family(zoned R-8); South: Residentia/Single-Family (zoned R-8) West: Monroe Avenue NE, Residential Single-Family(zoned R-8). !. Conclusion: 1. The subject site is located in the Residential Single Family (RSF) comprehensive plan designation and complies with the goals and policies established with this designation. 2. The subject site is located in the Residential—8 Dwelling Units Per Acre zoning designation and complies with the zoning and development standards estab(ished with this designation, provided all advisory notes and conditions of approval are complied with. 3. The proposed four lot short plat complies with the subdivision regulations as established by city code and state law, provided all advisory notes and conditions of approval are complied with. 4. The proposed four lot short plat complies with the street standards as established by city code, provided the applicant constructs a sidewalk adjacent to Monroe Avenue NE or receives a waiver or deferral from the Cit�s Board of Public Works. 5. The applicant will be required to extend the water and sewer line(s) to the eastern property boundary and provide the City with a 20-foot wide easement. 6. The applicant will be required to install a ne�v fire hydrant within 300 feet of the furthest house within the proposed plat. J. DEC/SJON: The Jay Hill Short Plat, File No. LUA-03-067, SHPL-A, is approved subject to the following conditions: 1. Lots 1 shall be required to utilize the 26-foot wide easement for vehicular access via Monroe Avenue NE. This condition shall be placed on the face of the short plat prior to recording. 2. The applicant shall be required to erect a street address sign, visible from Monroe Avenue NE, indicating all addresses within the short plat. 3. The applicant shall be required to provide a five-foot wide landscaped setback adjacent to the northern property boundary of the subject site. The landscaping shall be installed prior to final short plat recording. 4. The applicant shall be required to construct a four-foot high solid wooden fence for the first 20 feet from Monroe Avenue NE,then proceed with a six-foot high solid wooden fence along the remainder of the northern, eastern and southern perimeter of the property. The fence shall be installed prior to final short plat recording. 5. The applicant shall install a construction fence and silt tence along the down slope perimeter of the site. The silt fence shall be in place before clearing and grading is initiated and removed prior to final short plat recording. shpkrpt.dx � __ . i � -'� i �y ot Renton PB/PW Department Administrative Land Use Action � REPORT AND DECISION DATED August 8,2003;PROJECT LUA-03-067,SHPL-A Page 8 6. The applicanYs contractor shall perform daily inspections of the erosion control system and provide any �f recommendations regarding modification or redesign to the inspector of record. � 7. The applicant shall pay the required Transportation Mitigation Fee at the rate of $75.00 per net new average daily trip associated with the project estimated at$2,153.25. The Transportation Mitigation Fee shall be paid prior to final short plat recording. 8. The applicant shall pay the required Fire Mitigation Fee equal to$488.00 per new single-family lot estimated at $1,464.00.00. The Fire Mitigation Fee shall be paid prior to finat short plat recording. 9. The applicant shall pay the required Parks Mitigation Fee equal to $530.76 per new single-family lot estimated at$1,592.28. The Parks Mitigation Fee shall be paid prior to final short plat recording. 10. The applicant shall be required to install separate water meter box connections for each new building lot prior to final short plat recording. 11. The applicant shall be required to install the new side sewer stub-out connections for each new lot prior to final plat recording. DATE OF DECISION ON LAND USE ACTION: August 8, 2003 SIGNATURES: ✓ � .7 Gregg A.Zi rm , PB/PW Administrator d cision date , i shplfrpt.doc III. OFFSITE DRAINAGE A. UPSTREAM DRAINAGE The upstream offsite drainage contribution to this site wiil be negligible. This site is higher or equal in elevation from any of the surrounding properties. There currently is no off-site fiows that enter the site. The proposed development will not change this condition. B. DOWNSTREAM DRAINAGE The drainage from the site will be discharged into the existing drainage system that is in the east gufiter of Monroe Ave. NE. At this location, there is a type 1 catch basin in the curb flow line. This catch basin is approx. 4.5' i� deep and has a 12" pipe runs to a type 2 man hole near the center of the I street. The catch basins along the west side of Monroe Ave. also flow into I, this man hole. The storm drainage main within Monroe Ave. is a 24" pipe i and has a tributary area that extends norfh fo NE 12th St. and is east of �I Monroe Ave. NE. � The drainage main runs south within Monroe Ave NE. for approx. 20' past the site and then tums to the west. It runs for approx. 400' through a , drainage easement before intersecting with NE 7t" St. there are 2 #ype 2 ' catch basins within this easement. The drainage main then continues west along the norfh side o# NE 71h St. It was reviewed for approx. '/2 mile within NE 7th St. and appears to continue west within this street. The drainage system within NE 7th St. is a drainage main within the pavement, norfh of the centerline. There is a series of type 2 man holes along the street. The drainage system appears to continue to the west and under the I-405 freeway. It is within the Lake Washington Drainage Basin. Inspection of the drainage main piping did not reveal any signs of flooding or overtopping. The inspection was performed in May, 2003, during a period of low rainfall. The un-detained flows from the proposed shorf plat should not have an adverse effect on this downstream droinage system. �� l I I I I I I�� � � _;- ���. ; F a�tL�_____ ►c c{-'� + N - 1� �_ g � �� « �, � ` _- - � - - �' �'�f � � . .�,�, ��.« � - - -_ � ►-�� � s-arn '*� -- - - � -- ,',-_•�:�__ ; � c-si . �p� - -� / i i•�'_- ~:'�?�� �i , �,� _ � _ �] � �;�' „-- _;� �ra � } � .� „ ,�; i ' ��"'-.��;: : �� o �, . Q , } a�� pu a ,� ,.��, � . {-iltl L�YCt ` — �� I � �� j�� _ �p _ - � -�Yc �-aYn � , j= �c L�� �t r i � �. •arc r ' . �-a � �ya � -- � � � � � �� �.._ � � �-._ �_ � � r�a'n � � / �w'n c -- ' ' a�, �� �;.� � � � f-�7t p . c� \ _ \ ct� , . , �0 � 1 CI � — -. _ � � W_'__ :\A ,.�\\��, '� \ 1-�]'LI YQ'[I / .�1 . .. ._ . �._ �yC{ -- __- � ,ji - \� C N' i 'Cl �/� - - _" � ` '. -- , �-�ra � .�Q, - � -arc� .rc Ll / I ��- .. s�[7 .�� � c,f/ . � — - -- � -� lq ,. c-trct o-�7n �, �4 = -— -- -- � � ►�-�n. • - �/' —- - i -" \ ..,; qYn �-arci - - - -- - -- - - � , c -- -- o� , _.- - N - � r__._ � \� ci-uc� � _ —— — - ----- - - -- � , � , , t-trq � . •ct ' '-- / '� � a-crc � � � r-vc� r-crci a�a'n -- _ -� l� - - - - � �L a� n �-t1� �-crc \ ' ��� c-�c � � � n _ , - Z�� -- ..- , '_ - - - " — - ,o oi-cf c_�s ►i�va _ � / �- �� . __ _._ rp-__ �� � �� . - .._. _ --- - � ---- � , ' �0 �-L7[t -- ` -� - C X = i _ -- -__. � -ca'c� _.- . -c'c a-�rciJ -ca'c �- � �_ " __ `. � ` _ , L i-u�c� __�. ro _. ,,�� -_ _�a.< <a.� _-- --- , _ .. --- r., _�� �� . - _ _---- -- ,� �r �-.� � - - - ---- �� __ _ -- _ - - Y ¢ ���,T:, �-�.�� I` '`' _ : ���, __ __ - �, �, _�,�, � _ . _ _ �; � -�r�� o�-�� - -- __-- �! � ` - --- ac� -•- ' n-vc . _ __ ; -._ �-,r�� r�_ ` o�r`�c --_ � � - - - - -- - a� �, -- _-- - � � . }� a� p ,��,,� -r n �a e� ►-sYc� -- -- -- Q� •Ja ; � �, I - i � `. � _ ._ -_--" c fYcc , -'•-__.. _...�. ._ 1 L 3 �.-, �� i � . , a�` - - —: `, — - � -�---- — � � , - � � - , , - � �� _ _ �__ � .�. ,,� --- -- � AYq '- - : `- -- . ►-v �� � ... [1.. f1 7�!G - 'Z [I Y117C - [t "- -.. _� �` -, f-r.. , � .n� _. -- ,. , , 9 C [-fY , �-��� A -- �. _ ' i-+' _'\ - "i-v ct a��'c' , �,. c-w i -w'c� - - - - ---� .p _. _ _ H7U --- -+rn _�( � ,r ~ c _i 4 �- ct i'� - - . . r�7n ' ' ' ` ! 7-f CI ""T � I i 71Q��1 ♦ ,� , }qG'�[ C 9fC �a \( � w ----�� - -- 3N _ _ ����r __ , S `� u`� _ __ ' -A �.s�c� �r � - --- , �ra � 1 -- /" �- ,,� � ~j► - - - �-n - -- c-c:rn ( '-u'a -- _ - - a �M _ '- - t=-"- _ �� _ ---- - ,- -c'".. -- - - N ' _. _ ,- �- . -- � cr '�=' ` � __. o �" 3N s u -- --� M- �..� �_���- ;� ___ � 3 r�__ � _ _ _ _ _ 4 rcrc� -- - _�_ ' Q- ---- a . . �,� X._ -__ o-crct - �� --- — -- , �a � - . ___ P � ' iS-G7'p � 1-� 0 — - t]'t�—._1_ --', 3--- �J � -- p � ` ____ ..- -- . rI - ---- - �"� a D • - —...__ ___. � f�5 - � � }� �-- __ �-- . _ _ __ \a rc -csc, r-u'c�` -u'n - < ,q -. � \ �c�'c� < � • � Y. _ i - --- _ - Jod ��__ _ � 1 -- _� - � rc� .. - - c n - -- � lJ' . � _. . - � --- .. _ -_. _ - w --_ _ ---. . j t7ct� _ � `"— ----� _..-- ' � ��� t-s�s , � �^rt-,__ /c� �j�l --- „i - � � � IV. PREDEVELOPED DRAINAGE There are no existing drainage improvements on the site. A porfion of the on-site runoff sheet flows to the west, towards Monroe Ave. NE. A porfion of the site runoff sheet flows to a low point on the south property line. There is an existing drainage system within the gutters of Monroe Ave. NE. , The downspout runoff from the existing house disperses onto the ground I, near the house. For the purpose of calculating the peak drainage flows � from the pre-developed and from the developed site, the entire parcel area plus fihe area of the new frontage sidewalk was used as the drainage basin. The time of concentrotion was calculated using a critical distance of 160' (of sheet flow) across the tall grass (modeled as pasture for this calculation). The flow path was from the high point along the norfh property line to the low point along the south properfy line. The existing house, walks and gravel driveway were considered as impervious surface for the predeveloped condition. The existing drainage analysis was performed using the "Waterworks" hydrology software and its summary tables and charfs are attached for reference. The methods outlined in the King County Surface Water Drainage Manual were used as guidelines. Following this page are the data sheets used for the computer input data. The computer summary sheets for peak flow and time of concentration calculations are also attached. Below is a brief description of the existing drainage characteristics: Time of concentration: 20.34 minutes 2 year peak flow: 0.10 CFS 10 year peak flow: 0.19 CFS 100 year peak flow: 0.32 CFS ' total area: 0.69 acres pervious area: 0.63 acres curve number: 85 impervious area: 0.06 acres curve number: 98 � Jaeger Engineering HILL SHORT PLAT , DRAINAGE CALCULATIONS PRE-DEVELOPED DRAINAGE HYDROGRAPH SUMMARIES BASIN SUMMARY BASIN ID: A10 NAME: PRE-DEVELOPED, 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 69 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0 . 63 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 00 TIME OF CONC. . . . . : 20 . 34 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 06 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 160 . 00 ns : 0 . 2400 p2yr: 2 . 00 s : 0 . 0380 PEAK RATE: 0 . 19 cfs VOL: 0 . 09 Ac-ft TIME : 480 min BASIN ID: A100 NAME: PRE-DEVELOPED, 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 69 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 63 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 85 . 00 TIME OF CONC. . . . . : 20 . 34 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 06 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 160 . 00 ns : 0 . 2400 p2yr: 2 . 00 s : 0 . 0380 PEAK RATE: 0 . 32 cfs VOL: 0 . 14 Ac-ft TIME : 480 min BASIN ID: A2 NAME: PRE-DEVELOPED, 2 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 69 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 63 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 85 . 00 TIME OF CONC. . . . . : 20 . 34 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 06 Acres CN. . . . : 98 . 00 TcReach - Sheet L: 160 . 00 ns : 0 . 2400 p2yr: 2 . 00 s : 0 . 0380 PEAK RATE : 0 . 10 cfs VOL: 0 . 05 Ac-ft TIME : 480 min � � ��-��,. ��t�� ��� � 1 T G = ZD , �— 1�1 th . 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S �,��;��n-, �'� c�8 = �' ��'� �, : . � 0�12 I = �.�) - �'���`U� �"� � Bb = t`�J �S L°�P� : �.s n o� !.�j u.-a �C : ro �� s n e»�. ,a-� �,�, � �5 v+L�S u�� � I I � � c} n c3a-� � Y�o o� w��}� �ppc��', ��� > S�vra-�� 'a„Jr'O S�� o S . / ��'� , �'�'tIJ� C�1�1 �J��.� � � �� b� ' o � �S. L ' z�Z�� - ,� ��7 ,t�jCj C� �' �� rsb2� � l - �1 S i ��-L-V'� ��2 V� a V�.�. S Cl�� ��"�D `��'<?�'�C�.r '� 1 LJ'�a a � � � � � �� �9 ) l � �-, S �►�,-� j �� -a-� �,,,�,a . �. ��� � �t ��J N�-�d � �='-�.t O��' - 3�d _. �01-�� File Basin Hydrograph Storage Discharge Level pool 3e�e5eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee; eeeeeeeeee; o ° SHEET FLOW CALCULATOR - INITIAL 300 FEET o 0 0 0 0 0 °DES°Mannings Sheet Flow. . . . . : 0 .2400 ° ° °ARE°Flow Length (ft) . . . . . . . . : 160 . 00 °HOICES ° °RAI°2 yr 24 hr rainfall (in) : 2 . 00 ° ° °TIM°Land Slope (ft/ft) . . . . . . : 0 . 0380 ° ° °TIM° COMPUTED TRAVEL TIME (min) : 20 . 34 0 0 oR.AIo TYPICAL MANNINGS VALUES FOR INITIAL 300 FT °A ° oABso 0 0 °BAS°Smooth Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 011 ° ° °STO°Fallow Fields of Loose Soil Surface. . . . . . . . . . . . . . . 0 . 05 oy ° ° °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 lawns . . . . . . . . . . . . . . . . . . . . . 0 . 15 ° ° °CN °Dense grasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 24 0 ° 0 oBermuda grass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 41 0 0 0 oRange (natural) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 13 0 0 ' °PEA°Woods or forest with light underbrush. . . . . . . . . . . . : 0 .40 ° ° °PEA°Woods or forest with dense underbrush. . . . . . . . . . . . : 0 . 80 ° ° °TOTo 0 0 � ° OFlOKey: QUIT F5Key: CLEAR °ete ° ° Pgaeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeefit ° aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee r j ��� C�V �i� i ���t� �� CtJ`�l C��l , ���(�, V. DEVELOPED DRAINAGE The developed project will include the private asphalt road and hammerhead that is onsite plus the new houses, driveways and new sidewalk along the Monroe Ave. NE frontoge. The road's asphalt surface will use a thickened edge curb to control and direct the drainage. The drainage will then flow into o grass-lined biofiltration swale. The porfion of the driveway adjacent to the bioswale will sheet flow to the norfh, off of the pavement and directly into the bioswale. The flow at the end of the biofiltration swale will be collected by a catch basin and piped to a second catch basin cat the south edge of the private road. This catch basin will also receive the pipe from the roof downspouts for all of the new houses. This catch basin will discharge into an existing catch basin that is within the east gutter of Monroe Ave. NE. This catch basin is a type 1 CB with a vaned grate and is approx. 4.5' deep (to inverf). Detention is not required for this project. It meets the criteria to qualify for the exemption allowed in the code for negligible increase in the peak flows when comparing the predeveloped 100 year storm and the developed 100 year storm. If the 100 year peak flow for the developed condition is less than 0.5 CFS greater than the 100 year flow for the predeveloped condition, then the site is exempt from drainage detention. The calculated 100 year peak flows for this site are 0.49 CFS for the developed site and 0.32 CFS for the predeveloped site. The difference is 0.17 CFS which is less than the 0.5 CFS that is the threshold for the exemption. Similar to the existing condition, the SBUH hydrograph method was used to determine the peak flows for the various storm events. The computer data sheets for the developed flows follow this page as well as the works sheets and the time of concentration calculations. � time of concentration: 8.03 minutes 2 year peak flow: 0.21 CFS 10 year peak flow: 0.34 CFS 100 year peak flow: 0.49 CFS total area: 0.69 acres pervious area: 0.26 acres curve number: 86 impervious area: 0.43 acres curve number: 98 ���� ���� ���T ��cLOP�� �R ►�i ��F D � � - ��� �� . j�`�'� S i�e R-r�� ��� s n 2w s� �.w oJ_�. �� �,r-� S-�r��i C �M�n�roe. �v�e, t��� � = O� c� �. �S�rn 2 0.5 U se� `�0 r' �re- �e�le��ed� , �-+�n� �i1 �`� � . ���� �;v'f`(� ��� ; ��t� I l , Z�'�c1 p�'�s(o us : C� _�� 'I 6,.. . 1�;'t��,.t�Z- r�oo� � 'I � �� _ _l ^L 23�? �z.o> + �S�Ze�� -� ZCI � ,� S 1J�33 �; � lu N 2w T���a,�2, �L ;�W c�,t��. � !JJ�5� = � � G N� hovses £ d r�v`e.�c+-�S ; -J�' � ' 2 S o 0 �/ L oT - l G S[�"� J d� ro�--�-1 �. �,�.��o�� � ��7�� �- _ � , �d rG L . ?er�4ovs � Ct� � gC� ( � �,� , �. ���c����; �� �� ' � , � ? = O, ?--l.p f�G • � c . T,�n� o� c�r�c c��F� o ti �r�� , �-�� �� � .�T�,� � �� � � ' �'� �rl e�.T �e w GZ.c�'�s ��- � � V�O�'!���r� ��1 u'�n � ��� ?.-0 i � . S�Q2T �ow o��mss �a�.w n , ��.��� S�;� = d-O Z- 4c�� _ Z .`�°f -j o �'G = g , c� 3 tr t�n�`l'e S 5e� G�w�,P�i� �, �U t'�c�;�M�_r�� ��►�2�'/ DF��.-vt'�-�D L��tN�G�. CGots`�'J i _-- --- - -- --- - _ ___ � _ _ i D_ =SO��U�! i i�s '� _ . , -- - ---- --- -- - - -- --- ---- -- I , j�.Z = Z.O �r _ ----- - _ _ - - --- -- ----- -- - 2 i�n - Z� �o ' -�--- - -_-- --— ----- ---- - ' _ -- - -- --- � - 3 �� __ _ __ __ ----- 3 . �o o - _ _�� __ . —— -------- - -- _ - - - - -- - -- _ -- - _ _ - � . �������� P r� , , . �` 'rZ-ow S'._-- — — - - __ -- - _ _ _ -- -- - - -_ __ _ _-- - -- 1�. __ ��,, - �' Z 1 Crs ----- ----------- ---- Z� Q�o_ = c�. 34 c�=-S --- _ - ---- - —- - -- __ - _ 3 Qco� __ _�� �-� �S __ - ' ' -—-- --- _----------- ---------__- -- - -- --- ----------- - -------- - Jaeger Engineering HILL SHORT PLAT • DRAINAGE CALCULATIONS DEVELOPED DRAINAGE HYDROGR.APH SUMMARIES BASIN SUMMARY BASIN ID: B10 NAME: DEVELOPED, 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 69 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0 . 26 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 8 . 03 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 43 Acres CN. . . . : 98 . 00 TcReach - Sheet L: 70 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0290 PEAK RATE : 0 . 34 cfs VOL: 0 . 13 Ac-ft TIME : 480 min BASIN ID: B100 NANE : DEVELOPED, 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 69 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 26 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 8 . 03 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 .43 rcres CN. . . . . 98 . 00 TcReach - Sheet L: 70 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0290 PEaK �TE : 0 . 49 cfs �%OL: 0 . 18 Ac-it TI:sE : 480 m=n BP_SIN ID: B2 NAME : DEVELOPED, 2 YEAR SBUH METHODOLOGY , TOTAL AREA. . . . . . . : 0 . 69 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 26 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 8 . 03 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 .43 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 70 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0290 PEAK RATE : 0 . 21 cfs VOL: 0 . 08 Ac-ft TIME : 480 min � . _ _ _ File Basin Hydrograph Storage Discharge Level pool 3eee5eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee2eeeeeeeeee ; eeeeeeeeee ; o ° SHEET FLOW CALCIJLATOR - INITIAL 300 FEET o 0 0 0 0 0 °DES°Mannings Sheet Flow. . . . . : 0 . 1500 ° ° °ARE°Flow Length (ft) . . . . . . . . : 70 . 00 °HOICES ° °RAI°2 yr 24 hr rainfall (in) : 2 . 00 ° ° °TIM°Land Slope (ft/ft) . . . . . . : 0 . 0290 ° ° °TIM° COMPUTED TRAVEL TIME (min) : 8 . 03 0 0 °RAI° TYPICAL MANNINGS VALUES FOR INITIAL 300 FT °A ° o�so 0 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 ° ° i °ARE°Short prairie grass and lawns . . . . . . . . . . . . . . . . . . . . . 0 . 15 ° ° °CN °Dense grasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 24 ° o 0 oBermuda grass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 41 � o 0 oRange (natural) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . o . 13 � o � °PEA°Woods or forest with light underbrush. . . . . . . . . . . . : 0 .40 ° ° � °PEA°Woods or forest with dense underbrush. . . . . . . . . . . . : 0 . 80 ° ° °TOTo 0 0 ° OF10Key: QUIT F5Key: CLEAR °ete ° ° Pgaeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeefit ° o .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. _ .. .. .. _ .. _ .. . .. .. .. .. .. .. .. .. .. .. .. .. .. .. _ .. .. .. .. .. .. .. .. .. .. .. .. _ .. _ .. .. .. .. .. .. .. .. .. aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee `:___ �e-v'�'�'J� � I '�Y�Q, �� �,c��,�-'�c,�r� Trapezoidal Channel Analysis & Design Open Channel - Unifonn flow Worksheet Name : HILL SHORT PLAT Comment : BIOFILTRATION SWALE, DESIGN CONDITIONS Solve For Bottom Width Given Input Data: Left Side Slope. . 2 . 00 : 1 (H:V) Right Side Slope. 2 . 00 : 1 (H:V) Manning' s n. . . . . . 0 . 350 Channel Slope. . . . 0 . 0200 ft/ft � Depth. . . . . . . . . . . . 0 . 33 ft Discharge. . . . . . . . 0 . 07 cfs Computed Results : Bottom Width. . . . 0 .42 ft Velocity. . . . . . . . . . 20 fps Flow Area. . . . . . . . 0 . 36 sf Flow Top Width. . . 1 . 74 ft Wetted Perimeter. 1 . 89 ft Critical Depth. . . 0 . 08 ft Critical Slope . . . 4 . 7630 ft/ft Froude Number. . . . 0 . 08 (flow is Subcritical) (� } � � r � 1� Tl l �� lra-��`J1 S W C�...�-t.. ; �p-�1��`�. '��.0�!.����^�,� � � � L J ��u��r�� �jc�j'�'�rt� W tc,,��, _ � g" , , �C�p� I�`�G ��o� � l ' f .SZ..���-2 , � � `�� �'���Cn � � rr � � ? -� � Q �� `� c�`C`i c� � �o�`�' ,n, = O � �:.��� = V� � • � I �o�`�nr� t�tJ �d�� Open Channel Flow Module, Version 3 . 12 (c) 1990 Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, i ,I VI. EROSION CONTROL SYSTEM The erosion control system was designed to minimize any contaminated site runoff from entering the adjacent properfies or leaving the site. There is little possibility that runoff will enter a neighboring properfy since the grading necessary for this site is very minimal. The clearing limits cover approx. half of the site and are limited to the areas for road and utility construction and for the demolition of the existing house. The potential for runoff and mud entering the public ROW along the frontage road will be reduced by the quarry spall construction access onto Monroe Ave. NE. The site is small enough and without the need for grading, that a sedimentation facility is not warranted. Besides the silt fencing, the erosion control plans will also show the cleoring limits and the location for a rock pad construction access point. Catch basin inlet filters will be shown to be installed on the existing catch basins within Monroe Ave. NE. These will also be used on all new catch basins installed during the construction of the project. AFPENDZX A CH.ARTS , TAELES, GRI�PHS FROH RING COUNTY Sh'H H��h'U1�L I � II �I KING COUNTY, wASHINGTON� SURFACE WATER DESIGN MANUAL f�GURE 3S.2A HYDROLOGIC SOIL CROUP OF THE SOILS IN KINC COUNTY � , HYDROLOGIC HYDROLOGiC• SOtL GROUP GROUP' SOIL GAOUP GROUP• • Aiderwood Orcas Peai D Arents. Atderwood t�!aterial C Oridta D Arerits, Everett Material pvall C Beaus)te C P�chuck C Betilnpham D PuQet D Brlscot 0 Puyaflup B BucMey D Ragnar B Coasta! Beaches VariaS'e Renton D Earimont SAt Loam D Riverwash Vartab'e Edgewick C Salal C Everett A Sammamish D it�dlanoia A SeatUe 0 iQ:sap C Shacar D baus C Sl S�t C Mbced Aliwial Land Variabie SnohorT+ish D NeAton A Suttan C �fewberg B Tukw►a D Nooksack C Urban Var{ab'e Norma! Sandy Laam D Woodirnale D _ HYDROLOuIC S01L GROUP CLASSlFlC,�TIONS _. A (Low runoN potenta'j, So�Cs having high ini�trifon rates:even when thorough!y we�ed, ar►d conss:ing chie0y o!deep, weil�o-excess�vely dralned sands or gravels. These sols have a high rate of water transmission. � B. (1.loderately lo•+v n�:�c'f po;ential). SoGs har�ng moderate in!�tration rates wtien thorough!y weried, and consisting chiefly ci moderately fine to mode2tely caarse textures. These sols have a moderate rate d water transmissiol C. (F,�oderately high r�.-�ii p�;entiaf). So�s hati�ng slow 1n utr�tio� �ates w�en thorough!y wened, and conslsiinq chiefly od soEs wwtihh a layer that fmpedes dowrrn2rd movemerd of water, or sops with moderziely � Me to fine textures These soEs have a slaw rate of water transmission. D. (High runoH po:en:�J). SoPs having very s�ow in�i irat(on rates wfi�en thoroughly weried and corisLs:ing chleRy of day so�s with a htflfi swe�tinfl poterttlal, soRs wfith a permanerrt high water table, so�s with a hardpan or day layer ai or near the surface, and shallow so�is wer neariy impervious materlal. These soP,s have a very slcr�v rzte d water transmission. ' From SCS, TR•55. Second Edhlon, June 1956, Exhibk A-i. Revislons made irom SCS, Sofl Irrierpre�ation Record, Forr� �r5, Sepiember 1988. �.s.z-z �r .. K1NG COUNTY, WASIi1NGTON, SURFACE WATER DESIGN MANUAL TABLE 3.S1B SCS R'ESTERN K'ASHINCTON RUNOFF CUR�'E NUf�iBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (PuWished by SCS in 1982) RunoH curve numbers for seleCied apricultural, suburban and urban land use lor Type tA raintall dlsiribution, 24•hour storm du�atlon. '� CUAVE NUMBERS BY HYDROLOGIC S ROUP LAND USE DESCRIPTION A 8 � 0 Cultfvated land(1): winter condltion 86 91 9e 95 Mountain open areas: low growing brc�sh and grass:ands 7d 82 89 S2 Qrre�e�. f 2,MVrJUt Meadow or pasture� 65 78 85 89 Wood or forest fand: undisturbed 42 64 76 81 Wood or lorest land: young second growth or brush . 55 72 E1 86 Orchard: wi;h cover crop Bi 88 S2 9d Open spaces, lawns, parks, gdf courses. cemeteries. �2��e�J�t IandsCaping. P�.1'V i O�. good condhion: grass cover on 75� or more of the area 68 80 &6 90 tafr condhion: grass cover on 50% to%596 of the area 77 SS 90 92 �+<1� -- 1��-�`'. Gravei rcads and parking lo:s � i6 85 89 91 Dirt roads and parking lots 72 82 89 �— �`f�.L�:�x� impervious suriaces, pavement, roo!s, eic. 98 98 98 98 � Open water bodies: lakes, wetlands, ponds, etc. �00 100 0 �00 Single Family Residential (2) Dwelling UnR/Gross Acre % ►mpervlous (3) t.0 DU/GA t5 Separate curve number 1.5 DU/GA 2D shall be selected Z.0 DU/GA 25 for pervious and 2.5 DU/GA 3p impervlous ponion 3.0 DU/GA 34 ' of the slte or basin 3.5 DU/GA �9 4.0 DU/GA e2 4.5 DU/GA eb 5.0 DU/GA ag 5.5 DU/GA 50 6.0 DU/GA s2 6.5 DU/GA �4 � 7.0 DU/GA SS Planned unrt develcpmen,s, �5 impeM1�ious condominiums, 2partmen;s, must be computed commercial business and industrial areas. (t) For a more detailed description of agricultural land use curve numbers reter to h'ational Engineering Handbook, Seciion 4, Hydrology, Chapter 9, August 1972. �2) Assumes rool and driveway runoH is directed in;o street/storm system. {?) The remaining pervieus areas �a�Nr) 2re cons��ered 10 be in good condition fer these cur��e numbe!s. ' 3 � �.3 1/�0 � K ] NG COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 3.S.IE 10.YEAR:A-HOUR ISOPLLJ�'ULS 2,� — --�� — � ..�- —�_ —� ---._ ._� —�---- —��:.�----�—.. � .` ..� �� ��' �. , � _� �� , . � .; , ( � — — ` � � � 1 \ � �---� � �� `"'r � -� `� ;� � ! ,1 � 1" ' � 24 - � � /' _ . 2g ; � � � �1 _ — ' ' � � ?� ;' _ , —�.� � �- , 2.7 � ' —� I ` -- 'i 2.8 _ i. �_ j � / ° _ � � � =- � _. ,' ° 1 � � 2,9- ��� � r ,� �,� t r r:,. � _ � ' _ � � � r .� ; �_� —�` , � � , I� _ ..�,� � ,� �: �0 �� - !�� --� s — � . '` — `.• ' — ' ' ` I � � ' ,•• - '1,�, ��' � �; -- ,c�` ,l 3 /f _ � �., �l. _ :�,�._ �_ ') r �: = a � r ; � _ r •`.� �' 1 �,� _ 1n� `)� � , -- _ _ 3� � � ' ; r �; i i -�. ' ' _ � �' � � ' � ' ! _a � ' � -` ` �: -'- � 4 � � f • �� 33 _ '�__ _ � �1 '. _ �r, �' �, ��` ; ; ,.,��7 .; , � � � _ � >. � � � � t � , � � � - `� \ ; � _L'� •� 1 1 � E � �'— t ` � i 1 `._ ��.. 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