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Storm Water management Plan for parking lot improvements
Melanie Curtis From: Melanie Curtis Sent: Wednesday, May 20, 2009 10:23 AM To: Tom Kellogg; 'Amundsen, Darren T' Subject: 2687 Wayzata Blvd - BP#2009-00122 Attachments: admin_ci_orono_mn_us_20090520_102005.pdf; admin_ci_orono_mn_us_20090520_ 104406.pdf Kellogg Attached is the Storm Water Management Plan for parking lot improvements to 2687 Wayzata Blvd (aka Tim Herron/Western Steel Bldg). I will hand you the Grading plan at tomorrow's staff meeting as it is too big to scan. For billing purposes this should probably be filed under Building Permit#2009-00122. Also attached is my memo referencing the zoning items and information they needed to submit for the building permit approval. Please review the SW management plan and the grading plan (when I get it to you) and provide comments by May 28tH The permit has been issued, but we will not issue a CO or a Temp CO until this plan is completed. What do you feel is an appropriate timeline for completion? Thanks, Melanie Melanie Curtis Planning &Zoning Coordinator City of Orono 2750 Kelley Parkway Orono, MN 55356 Direct Dial: 952.249.4627 Fax: 952.249.4616 Planning &Zoning Office 952.249.4620 Email: mcurtis(&ci.orono.mn.us Website: www.ci.orono.mn.us 1 Anderson Engineering of Minnesota 13605 1st Ave North, Suite 100 • Plymouth, MN 55441 [L❑UTE❑ 01F UnIM 0U L Tel: (763)412-4000 Fax: (763)383-1089 DATE 5/19/2009 COMM. NO. 11586 www.ae-mn.com RE: PROJECT 11586—SPENSA DEVELOPMENT ALTA-ORONO TO MELANIE CURTIS DIST.METHOD: Courier-3 Hr PLANNING /ZONING COORD. CITY OF ORONO 2750 KELLEY PARKWAY ORONO, MN 55356 i14�,� WE ARE SENDING YOU ❑e Attached ❑ Under separate cover via the following items: �F0R O � El Shop Drawings F-1Prints Plans Se Reports El Specifications N ❑ Change Order ❑ Copies I Document Date I Description 3 5/19/2009 Site and Grading Plan 1 5/15/2009 Storm water report THESE ARE TRANSMITTED as checked below ❑� For Approval ❑ ❑ For Your Use ❑� As Requested ❑ For Review and Comment REMARKS Melanie: Enclosed is the Site and Grading plan for 2687 Wayzata Blvd. This is the Spensa Dev project. Call if you have any questions. Thank you. Mike Brandvold, P.E. 763.412.4017 FROM Mike Brandvold 4 -1 - C.C. L__e� GREG ENGEL,SPENSA DEVELOPMENT GROUP,LLC LAND DEVELOPMENT • MUNICIPAL • HIGHWAYS • RAILROADS SURVEYING •WETLANDS • ENVIRONMENTAL ASSESSMENTS Storm Water Management Plan Calculations & Summaries SPENSA DEY. GROUP Orono, MN Project No. 11586 May 15, 2009 Prepared By: Prepared For: Anderson Engineering of Minnesota, LLC Spensa Dev Group 13605 1st Avenue North, Suite 100 Minnetonka, MN 55305 Plymouth, MN 55441 Ph. 763 412-4000 Fax 763 412-4090 STORM WATER MANAGEMENT PLAN SPENSA DEV GROUP Orono, MN Comm. No. 11586 May 15, 2009 1 hereby certify that this plan, specification or report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. 11 Michael B. Brandvold, P.E. Reg. No. 41258 Prepared By: Prepared For: Anderson Engineering of Minnesota, LLC Spensa Dev Group, LLC 13605 1St Avenue North, Suite 100 Minnetonka MN 55305 Plymouth, MN 55441 Ph. (753) 412-4000 Fax (763) 412-4090 Spensa Dev. Group Proj No. 11586 - May 15, 2009 STORM WATER COMPARISON Discharge Summary ac-ft ac-ft 2-(2.8') 0.101 0.011 1022.6 10-(4.2') 0.17 - 0.111 1023.5 100-(6.0') 0.261 0.241 1023.7 Z:\Docs 11 500\1 1586 Orono Bldg-Spensa\RUNOFF DATA SHEETS.As X:\11500\11586 Spensa Orono\dwg\EXISrCOND DRAINAGE.dwg,5/15/2009 10:11:31 AM,\\SERVER5\LANIER LD520CPCL 5c, 1:50.4664 -----—----------- ------------ --------------------- ---------- F -------- -- --------------- �llx -- ---- --- - -- ---------------- ----------- �Ak –- ------------ < 4, L99Z 'ON SS3hI00V I Ala J ine moois S , V11 oo s n o N i -------- ---- --- ------ ------ ------------- -------- --- ---------- - ------------------------- gg — --------- VA -- ------ ------------ ----------– ------------------ I----------- ---------------- ---------- z----------------- ---- ------ m I .60.00s --- -------- -------------------------------- .0 ----------------- ------------------------ ------------------ --------------------- ---------- - - ----------------------------------------- ------------------ --------------- - -------------------------------------------------------- ------ ----------------------------------------------------- --------------- ------- -------------- ------------ ------------------ ------ ---------------------- ---------------------------------------------------------- ------------------- ----------------------- --------- ------- ------------------------------------- -- ------------------------------------- ----------------------- ---------------------------- -------- --------------------- -------------------------- --------------- — — — — — — — — — -- r X:\11500\11586 Spensa Orono\dwg\11586BASE.dwg,5/15/2009 10:31:13 AM,\\SERVER5\LANIER LDS20CPCL 5c, 1:50 --------- ------------------- --- --------- --------------- ---------—----- --- ---- ----------- ll_�------- --- • :7- •- ---------- ------------ --- ---------- q ;I p °r IrI g J ----- ----------------- 199Z ON 553HG(TV ji sn..,.n1 B r_1_ _ r t( • ---------------------- ------------ I ---------- ---------- . ----------- ---- ---- ---------- ----------- -- ---- ----------------------------------------- —- ---- —------ -------------------------- --- M.tolwxos--- -------------------------------------- - --------------------- —----------------------- --- -------------- ------=--- ----------------------------------------- ------ ---------------- --------------------- --------- ---------------------------- ---------------------- ----------------- --------------------------------------------------------------------------------------------------------------- --------------------------- __ -::::: - -1------------------------------ ------------ --------- ----------------------- ----------- ------------------------- ----- -------------- ------- --------------- ------------ t �� �t �ie+�"� K.•r�'ew� +.,.�_" ^^'F#r � ._fix s '"'" _ r �`ak ''�` 3 ;. - ��. 4e HI 'f2f z �,. r � z_ «;sem-.,, �-- ,�• � -� _�, t�.�tia,-�,�... -•wL...:+o.,-r".,,,x'..k.,,,.Ir,� ."'�'� pow:::. ,... ,�_��-r,..� .�'sc'n ,,.� "..'x...-^•--y.,,, -.+-w�.., � ,f,- ..� • a - ,. fit FrSb _ 'M - ;I • fy Rix-_Y t �% x i 49 1 41 pi K d. J �¢, v �K ��. r' r R c • �.� � w„<t� r f�'e#�.®` s ."y,,.,.�� #��'��, ' *�S"''w, -,�� 'a - �t 'z��:'t !- �s"�'.! x _ 711 i o9am?o r, /1 r GW-Well-graded gravels, sandy gravels Gravel, sandy gravel and GP — Gap-graded or uniform gravels, sandy 1.63 silty gravels gravels A GM -Silty gravels, silty sandy gravels SW-Well-graded, gravelly sands 0.8 Sand, loamy sand or sandy SP - Gap-graded or uniform sands, gravelly loam sands 0.6 Silt loam SM-Silty sands, silty gravelly sands rB 0.3 Loam MH — Micaceous silts, diatomaceous silts, volcanic ash C 0.2 Sandy clay loam ML-Silts, very fine sands, silty or clayey fine sands GC—Clayey gravels, clayey sandy gravels SC—Clayey sands, clayey gravelly sands D <0.2 Clay loam, silty clay loam, CL—Low plasticity clays, sandy or silty clays sandy clay, silty clay or clay OL—Organic silts and clays of low plasticity CH—Highly plastic clays and sandy clays OH—Organic silts and clays of high plasticity *Thirty guidance manuals and many other stormwater references were reviewed to compile recommended infiltration rates. All of these sources use the following studies as the basis for their recommended infiltration rates: Rawls, Brakensiek and Saxton(1982); Rawls,Gimenez and Grossman(1998); Bouwer and Rice (1989);and Urban Hydrology for Small Watersheds(NRCS). The rates presented in this infiltration table use the information compiled from these sources as well as eight years of infiltration rates collected in various infiltration practices located in the Twin Cities metropolitan area. levels of runoff. Care must also be taken when numbers appropriate to AMC II. However, if the selecting curve numbers for agricultural land as its specific conditions of interest are expected to use can change considerably annually and even differ, curve numbers appropriate to AMC I or III over the course of a season. should be used. Antecedent Moisture Conditions Antecedent moisture conditions (AMC) describe Infiltration Rates the moisture already present in the soil at the Infiltration is the process of water entering the time of the rain event. AMC level I represents dry soil matrix. The rate of infiltration depends on conditions, level II represents normal conditions, soil properties, vegetation, and the slope of the and level III represents wet conditions. Normal surface, among other factors. Discussions of conditions are defined as 1.4 to 2.1 inches of infiltration often include a discussion of hydraulic rainfall in the growing season in the five days conductivity. Hydraulic conductivity is a measure preceding the event of interest. Most evaluations of ease with which a fluid flows through the soil, of expected future site conditions use the curve but it is not the infiltration rate. The infiltration rate �� - N I ' I R60GR mia m , T f .. •�.�'� Q I K or RAN ,tea Bull r RINDARDp owsaw H o..�.TS.:� .rte. I -— I ._ _ .. .. — — --- — —.. .._.._ .— Rn°L�sw mwnstow 'rw~d�.z'...n�.w.....'a wi,..T.Yi..S.Ya,a•�w.ao I 1,�.1 I ;i I '\ I ^.__ -----•-----------------------�.ppw-•m•w-- - sr ----i------------- ------d - --- exLe - -- -- - '- - --------- ------------------------------- ----------------------------- - -- ------------- ------ ------ - ---- -- - . -------------------- -------- - - --- --- -- -- - -- --- ------ ----- ----- ----- ------- -y I ..,a.a.a....,.aD.a....a _.------.,.--,- , If •��°za•�-°sA.�. -•�'"a O I i_I i, 30° i i -- - I I� 1�i,r �� •�`" $ I• • ° I. Ill A la RI Y,X' I I I I';I I I Drsrnt a er CL 3 MPRH " '�' .xwL7�` 3 "�=• - r'{.{•i, i'•(' i / w,w om�wo i .,Ruxr —. i + • OiVAIIDR A `i i = j 138 Z.smma° r I --_--_-- - y�y .a.aw.aaD.a..aa. � R - ..� [—A P w mumm unw ,.��.n:e� �a-�°°rr>va•� ; � :y--- I.�...1 ,,__--�- ----------- -�----iarrA„wR .. •• , eLoac BUILDING zRe7 -i�\ _ '° ..•�• �'r � Rc. a.,.a L----- cow. ;T i a . ..a. � 1. , ; �•._-- ------= �s.ua u. I '"�•-•_i•� 1 � -- ----------- -.---- - —L_ -- . ------- ------- IF i s 7 a aaa..e.a q i �, .......... .�:� i - I 3 i D .a.i QD. i 1 i a U) co Ln D�eDRD. 0 a D Lr..arw .r,.Ll 0 .::«.,�; r:.:`y:i�;"' o.a,.nw ou r IRSR�oR... nri•,�— .. K .. .<.. ..aIr a ADDOLI,D� DOPIER cTA7E ONE C��! � �saaisD'a•nma a� ..,a. a'••,""`•" CALL 811 ��'a*�Si(tiVlCS w�eo R..us eerintaI nrwaDRR.a QL eoa ®+o .e �os ... DovIDQ D� Anderson Engineering of Minnesota,LLC SPENSA a' 118,1 RAr0 cI.IL DnaIn DDRIRa AND LARD RaR•■Tlna ORONO, MINNESOTA SITE, GRADING do UTIUTY PIAN FSPENSA DEVELOPMENT GROUP, LLC 1 OF 1 LM0 X P , :l EXISTING PROPOSED 4 RAIN G POND 1 (new Reach) Subcat Feapfi oh Llnk, Drainage Diagram for 11586 SPENSA-ORONO ared by(enter your company name here) 5/18/2009 [ Hyd:roCAD8 8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC ' 1 11586 SPENSA - ORONO Prepared by{enter your company name here} Page 2 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Area Listing (all nodes) Area (acres) CN Description (subcats) 0.185 61 >75% Grass cover, Good, HSG B (1 P,1 P,1 P,1 S,1 S) 0.471 85 Gravel roads, HSG B (1 P,1 P,1 S,1 S) 0.278 98 Building (1 P,1 S) 0.740 98 Paved parking & roofs (1 P,1 S) 1.673 a 11586 SPENSA - ORONO Type 11 24-hr 2 yr Rainfall=2.80" Prepared by{enter your company name here} Page 3 HydroCAD®8.00 s/n 000837 0 2006 HydroCAD Software Solutions LLC 5/18/2009 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1P: PROPOSED RunoffArea=42,540 sf Runoff Depth>1.76" Tc=10.0 min CN=91 Runoff=2.73 cfs 0.143 of Subcatchment 1S: EXISTING RunoffArea=30,350 sf Runoff Depth>1.67" Tc=12.0 min CN=90 Runoff=1.76 cfs 0.097 of Reach 1R: (new Reach) Inflow=1.76 cfs 0.097 of Outflow=1.76 cfs 0.097 of Pond RAIN G: POND 1 Peak Elev=1,022.58' Storage=4,430 cf Inflow=2.73 cfs 0.143 of Discarded=0.04 cfs 0.033 of Primary=0.10 cfs 0.009 of Outflow=0.15 cfs 0.042 of Total Runoff Area= 1.673 ac Runoff Volume=0.240 of Average Runoff Depth= 1.72" 39.17%Pervious Area=0.655 ac 60.83% Impervious Area= 1.018 ac t 11586 SPENSA-ORONO Type 1124-hr 2 yr Rainfall=2.80" Prepared by{enter your company name here} Page 4 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Subcatchment 1 P: PROPOSED Runoff = 2.73 cfs @ 12.01 hrs, Volume= 0.143 af, Depth> 1.76" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (sfl CN Description 1,590 61 >75% Grass cover, Good, HSG B 190 61 >75% Grass cover, Good, HSG B 2,340 61 >75% Grass cover, Good, HSG B 7,240 85 Gravel roads, HSG B 4,660 85 Gravel roads, HSG B 20,460 98 Paved parking & roofs 6,060 98 Building 42,540 91 Weighted Average 16,020 Pervious Area 26,520 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry,Typical Inspection Subcatchment 1 P: PROPOSED Hydrograph 3- ---;---;---,----------- 2.73 cfs -- ----------------;--- ---- — Runoff ;Type II 24-hr 2 yr Rair fa11�2.619 -- 2 --- --- --- --------;--- ---- --- --RunfA�kea42, i40s# ;Rumoff;Vo1um#=0.;143'of Ru�of( Deptha1.76" u` Tc=10,0 rain 1 --- i----------- - -- -- tV= 1-- J1 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 1 , 11586 SPENSA - ORONO Type 11 24-hr 2 yr Rainfall=2.80" Prepared by{enter your company name here} Page 5 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Subcatchment 1S: EXISTING Runoff = 1.76 cfs @ 12.04 hrs, Volume= 0.097 af, Depth> 1.67" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2 yr Rainfall=2.80" Area (sf) CN Description 1,590 61 >75% Grass cover, Good, HSG B 2,340 61 >75% Grass cover, Good, HSG B 7,240 85 Gravel roads, HSG B 1,360 85 Gravel roads, HSG B 11,760 98 Paved parking &roofs 6,060 98 Building 30,350 90 Weighted Average 12,530 Pervious Area 17,820 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Typical Inspection Subcatchment IS: EXISTING Hydrograph 1 1 1 1 1.76 cfs 1 1 1 1 1 Runoff 1 1 I I I I I I I I I I 1 I 1 I I I I I 1 I I I I I I I I I I I 1 1 ;Type 11 ,24-hr Zyr RairifallT2.80" Rum# Asea=30,P50;sf HI I I I I I � I I I I �Run'off;Volumo=0.097;I of ---' ' -- --- -- ,- , --- - -- Runoff-Depth> 1-.07"- O 1 1I 1 1 1 1 I I I ; TC612:0 min I I I I I I I I I I I /1`� I I I I I I 1 I 4N=00 YY I 1 I I I I I 1 I I I I I I I I I I I I 1 1 1 I I 1 1 I I I I I 1 I I I I I I I I I 1 I I I 1 I I 1 I I I I I I I I 1 1 I I I I 1 I 1 I I I 1 I I I I 1 I I I I 1 I I I 1 1 I I 1 I 1 1 1 I I I 1 1 1 I t I 1 I 1 I I I I I I 1 0 f ' 6 7 '8" 610 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA-ORONO Type 1124-hr 2 yr Rainfall=2.80" Prepared by{enter your company name here} Page 6 HydroCAD®8.00 s/n 000837 0 2006 HydroCAD Software Solutions LLC 5/18/2009 Reach 1 R: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.697 ac, Inflow Depth > 1.67" for 2 yr event Inflow = 1.76 cfs @ 12.04 hrs, Volume= 0.097 of Outflow = 1.76 cfs @ 12.04 hrs, Volume= 0.097 af, Atten= 0%, Lag=0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt=0.05 hrs Reach 1 R: (new Reach) Hydrograph I 1 I I 1.76 cfs 1 Inflow I I I I I I I I I I I --outflow I I I I I I I I I I I I Infiow�Aroa=Q.697 ac I I I I 1 I I I I I I I 1 I I 1 I I I 1 1 I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I 1 I I I I I I I I I 3 ---r---r---T'--T---1 -T - r---r---T I I I 1 I I I I I I I I I LL 0 1 I I I I I I I I I I I I I 1 I I 1 I I 1 1 I I I I I I I I I I I I 1 I I 1 1 I I I I I I I I I I I I I I I 1 I ! I 1 I I 1 1 I I 1 I I I I I I 1 I I I I I 1 I I I 1 I I I I I I I I 1 I I I 1 I I I I I I I I I I 1 I I 1 I I 1 I 1 I I I I I I I I I I 1 I I I I I 1 1 I 1 I I I 1 I I 1 I 1 I 1 I I 1 I 1 I 1 I 1 I I I I I 1 I 1 t I I I I 1 I 1 1 I I I I 1 I 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) r � 11586 SPENSA - ORONO Type 1124-hr 2 yr Rainfall=2.80" Prepared by{enter your company name here) Page 7 HydroCAD®8.00 s/n 000837 0 2006 HydroCAD Software Solutions LLC 5/18/2009 Pond RAIN G: POND 1 [93] Warning: Storage range exceeded by 0.08' [85] Warning: Oscillations may require Finer Routing>1 Inflow Area = 0.977 ac, Inflow Depth > 1.76" for 2 yr event Inflow = 2.73 cfs @ 12.01 hrs, Volume= 0.143 of Outflow = 0.15 cfs @ 13.70 hrs, Volume= 0.042 af, Atten= 95%, Lag= 101.3 min Discarded = 0.04 cfs @ 13.70 hrs, Volume= 0.033 of Primary = 0.10 cfs @ 13.70 hrs, Volume= 0.009 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1,022.58' @ 13.70 hrs Surf.Area= 3,070 sf Storage=4,430 cf Plug-Flow detention time= 236.8 min calculated for 0.042 of(29% of inflow) Center-of-Mass det. time= 137.6 min (908.4- 770.7 ) Volume Invert Avail.Storage Storage Description #1 1,020.00' 4,430 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,020.00 530 0 0 1,021.00 1,500 1,015 1,015 1,022.00 2,530 2,015 3,030 1,022.50 3,070 1,400 4,430 Device Routing Invert Outlet Devices #1 Discarded 0.00' 0.600 in/hr Exfiltration over Horizontal area #2 Primary 1,022.50' 2.0' long x 5.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Qiscarded OutFlow Max=0.04 cfs @ 13.70 hrs HW=1,022.58' (Free Discharge) '--1=Exfiitration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.10 cfs @ 13.70 hrs HW=1,022.58' (Free Discharge) t2=Broad-Crested Rectangular Weir (Weir Controls 0.10 cfs @ 0.66 fps) r j 11586 SPENSA -ORONO Type 1124-hr 2 yr Rainfall=2.80" Prepared by(enter your company name here) Page 8 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Pond RAIN G: POND 1 Hydrograph 3 ---,----,-- --,- -- ;-----;- - 2.73 cfs --,----,----,-- --,------,---;---- I I 1 I I 1 I 1 III III IIII I III - Inflow Outflow Inflow:Ar6a=0.977 Ac — Discard e d — PrimaryP4ak Elev=1,02.518': 2 --- --- --- --- I;Storage=4,430-of- wI 1 I 1 1 1 I I 1 I I I I i I 1 i I I I I I I I I I I I I I I I I I I I I 3 I I I I I I I 1 I I I I I I I I I I 1 i 1 I I I I LL 1 I I 1 1 I I I I I I I I I I I I I 1 I I I 1 1 I I I I I I 1 1 I I I 1 I I I I I I I i i I I I I I 1 i I I I I I I I I I I 1 I I I I 1 I I I I I I I I I 1 I I 1 I I t I 1 0.10 cfs I I I 1 1 I I I I I 1 I I I I I I I I 1 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA-ORONO Type 11 24-hr 10 yr Rainfall=4.20" Prepared by {enter your company name here} Page 9 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1P: PROPOSED RunoffArea=42,540 sf Runoff Depth>3.01" Tc=10.0 min CN=91 Runoff=4.52 cfs 0.245 of Subcatchment 1S: EXISTING Runoff Area=30,350 sf Runoff Depth>2.91" Tc=12.0 min CN=90 Runoff=2.96 cfs 0.169 of Reach 1R: (new Reach) Inflow=2.96 cfs 0.169 of Outflow=2.96 cfs 0.169 of Pond RAIN G: POND 1 Peak Elev=1,023.50' Storage=4,430 cf Inflow=4.52 cfs 0.245 of Discarded=0.04 cfs 0.036 of Primary=5.12 cfs 0.107 of Outflow=5.16 cfs 0.143 of Total Runoff Area= 1.673 ac Runoff Volume=0.414 of Average Runoff Depth =2.97" 39.17% Pervious Area=0.655 ac 60.83%Impervious Area= 1.018 ac 11586 SPENSA - ORONO Type//24-hr 10 yr Rainfall=4.20" Prepared by{enter your company name here} Page 10 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Subcatchment 1P: PROPOSED Runoff = 4.52 cfs @ 12.01 hrs, Volume= 0.245 af, Depth> 3.01" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (sf) CN Description 1,590 61 >75% Grass cover, Good, HSG B 190 61 >75% Grass cover, Good, HSG B 2,340 61 >75% Grass cover, Good, HSG B 7,240 85 Gravel roads, HSG B 4,660 85 Gravel roads, HSG B 20,460 98 Paved parking &roofs 6,060 98 Building 42,540 91 Weighted Average 16,020 Pervious Area 26,520 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Typical Inspection Subcatchment 1 P: PROPOSED Hydrograph 5 ---, --- ,--- 1----,----,--- -------"-- -----, -'-- I ------- Runoff 4.52 cfs I I 1 I I I I I I I I I 1 I 1 I I 1 1 I I 1 1 I Type II 24-ht 101yr 4 ---- ---- --------------- -- - --------------_---- Rairifa11=4.20" I I 1 I I I I 1 I 1 I I I RUnaff Asea- 42,646sf 1 I ! .V 3 ---;---,---,----,----,--- --- ---;RUi ff:Vol' --O.T246,af- ," ` RU�00 Deptha3.6,1" 3 1 I I I I I I I I I I I I I I I O I I I ! I 1 z= 1 „ 2 ---t---t----I----I----I_---h-- I ----F---''----I----I-Ic f _`0,0_ in_ I 1 I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I 1 I I I I I I 1 1 1 I 1 I 1 I I I I I I I I I I 1 I 1 I I I I I _I_ I 1 1 I 1 1 I I I I I I I I 1 I I I I I I I I I 1 I I 1 1 I I I I I 1 I I 1 I I I I I I I I I 1 I 1 I I I I I I I 1 1 I 1 1 I I I I I I I 1 I I 0- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA-ORONO Type 11 24-hr 10 yr Rainfall=4.20" Prepared by{enter your company name here} Page 11 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Subcatchment 1S: EXISTING Runoff = 2.96 cfs @ 12.03 hrs, Volume= 0.169 af, Depth> 2.91" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt=0.05 hrs Type II 24-hr 10 yr Rainfall=4.20" Area (sf) CN Description 1,590 61 >75% Grass cover, Good, HSG B 2,340 61 >75% Grass cover, Good, HSG B 7,240 85 Gravel roads, HSG B 1,360 85 Gravel roads, HSG B 11,760 98 Paved parking & roofs 6,060 98 Building 30,350 90 Weighted Average 12,530 Pervious Area 17,820 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Typical Inspection Subcatchment 1S: EXISTING Hydrograph I I I 1 2.96 cfs . I I I i Runoff 3------------------ 1 I I I I I 1 I I I I I Type II 24-ht 10;yr 1 I I 1 I I I I I I 1 Rairifa11-:4.20" RUno;ff Asea=30, 50;sf ---'Frunoff V0161rfi4=1D. 69 a#- 1 1 I 1 I I I Ruoff Depth>2.0119 OI I I I I 1 1 I I I I 1 Tc=12;0I mI in I I I I I 1 I 1 I I I I I I I I I 1 I 1 I I I I ■'_N=90 I 1 1 I 1 I I t I I I I I I 1 I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I 1 I I 1 I 1 I I 1 I I I I 1 I I I I I I I I I I 1 O 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA-ORONO Type 11 24-hr 10 yr Rainfall=4.20" Prepared by{enter your company name here} Page 12 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Reach 1 R: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area= 0.697 ac, Inflow Depth > 2.91" for 10 yr event Inflow = 2.96 cfs @ 12.03 hrs, Volume= 0.169 of Outflow = 2.96 cfs @ 12.03 hrs, Volume= 0.169 af, Atten=0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1 R: (new Reach) Hydrograph I I I I 1 3 2.96:cfs I I Inflow + I I I I I 1 I I I I I--- -------- --- ---41----1------ I----I-------- --- ---�- --- — Outflow I I I I I jnflow Ar0a=Q.6g7 Oc I I I I 1 I 1 I 1 1 I I I I I I I I I I I I 1 I I I I 1 I I I 1 1 I I I 1 I I I I 1 I 1 I I I I I I I I I I I I f I I I ------------------ I I I I I I 1 I I I I I 1 I I I I I 1 I I I 3 1 I I I 1 I I I I I I I I I I I I I I I I I I I I I O I I I I I I 1 I I I I I I I I I I I LL 1 I I I I 1 I I I I I I I I I 1 I I I I I I I 1 I I--- 1 -- ---I--- I - ---_I--- I ---I- --I-- 1 - --- - ---------------------- I I I I I I I I I 1 I I I I I I I I I I I I 1 I 1 I I I I 1 I 1 I I I I 1 I I I 1 I I I I I 1 I I I I I I 1 I I I 1 I I I I I I I I I I I I I 1 I I 1 1 I I I I I I 1 I I I 1 I I I I I I 1 I 1 I I I I I 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA- ORONO Type 11 24-hr 10 yr Rainfall=4.20" Prepared by{enter your company name here} Page 13 HydroCADO 8.00 s/n 000837 0 2006 HydroCAD Software Solutions LLC 5/18/2009 Pond RAIN G: POND 1 [82] Warning: Early inflow requires earlier time span [93] Warning: Storage range exceeded by 1.00' [88] Warning: Qout>Qin may require Finer Routing>1 [85] Warning: Oscillations may require Finer Routing>1 Inflow Area = 0.977 ac, Inflow Depth > 3.01" for 10 yr event Inflow = 4.52 cfs @ 12.01 hrs, Volume= 0.245 of Outflow = 5.16 cfs @ 12.06 hrs, Volume= 0.143 af, Atten= 0%, Lag= 2.8 min Discarded = 0.04 cfs @ 12.05 hrs, Volume= 0.036 of Primary = 5.12 cfs @ 12.06 hrs, Volume= 0.107 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt=0.05 hrs Peak Elev= 1,023.50' @ 12.06 hrs Surf.Area= 3,070 sf Storage=4,430 cf Plug-Flow detention time= 129.8 min calculated for 0.143 of(58% of inflow) Center-of-Mass det. time= 55.7 min ( 814.2- 758.5) Volume Invert Avail.Storage Storage Description #1 1,020.00' 4,430 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,020.00 530 0 0 1,021.00 1,500 1,015 1,015 1,022.00 2,530 2,015 3,030 1,022.50 3,070 1,400 4,430 Device Routing Invert Outlet Devices #1 Discarded 0.00' 0.600 in/hr Exfiltration over Horizontal area #2 Primary 1,022.50' 2.0' long x 5.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Qiscarded OutFlow Max=0.04 cfs @ 12.05 hrs HW=1,023.46' (Free Discharge) F--1=Exfiltration (Exflltration Controls 0.04 cfs) Primary OutFlow Max=4.63 cfs @ 12.06 hrs HW=1,023.41' (Free Discharge) t2=Broad-Crested Rectangular Weir (Weir Controls 4.63 cfs @ 2.55 fps) 11586 SPENSA- ORONO Type //24-hr 10 yr Rainfall=4.20" Prepared by{enter your company name here} Page 14 HydroCAD®8.00 s/n 000837 ©2006 HvdroCAD Software Solutions LLC 5/18/2009 Pond RAIN G: POND 1 Hydrograph I I I I 5.12 cfs I I , I Inflow I I I I I , 4.5 cfs Outflow - -- -- — Discarded Ptak ;Eley=1,03.% — Primary r3� 41 ---I,III,I,IF,IIIIII 4,,iIIIIIIIIIIIII---4IIIIII,,IIIIII,II---4IIIIIIIIIIIII,III---4--- -9_t-_oIII,II,1IIIIIIIIII -_-_r-a_-JpII1IIIIIIIII,,III-_-_e_-=-J,IIIIIIII,IIIIIII 4-4-_Iii,IIIIIiI3�I-_-_0-_1'�I,1IIIIIIIIIIII cf- 3 --- ___ IL---I-_ O2 ------- 0.010 _ - 1. 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA-ORONO Type 11 24-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here} Page 15 HydroCADO 8.00 s/n 000837 0 2006 HvdroCAD Software Solutions LLC 5/18/2009 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1P: PROPOSED Runoff Area=42,540 sf Runoff Depth>4.64" Tc=10.0 min CN=91 Runoff=6.81 cfs 0.378 of Subcatchment 1S: EXISTING Runoff Area=30,350 sf Runoff Depth>4.54" Tc=12.0 min CN=90 Runoff=4.50 cfs 0.264 of Reach 1R: (new Reach) Inflow=4.50 cfs 0.264 of Outflow=4.50 cfs 0.264 of Pond RAIN G: POND 1 Peak Elev=1,023.68' Storage=4,430 cf Inflow=6.81 cfs 0.378 of Discarded=0.04 cfs 0.039 of Primary=6.79 cfs 0.238 of Outflow=6.83 cfs 0.276 of Total Runoff Area= 1.673 ac Runoff Volume=0.641 of Average Runoff Depth=4.60" 39.17% Pervious Area=0.655 ac 60.83%Impervious Area= 1.018 ac 11586 SPENSA - ORONO Type 11 24-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here) Page 16 HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Subcatchment 1P: PROPOSED Runoff = 6.81 cfs @ 12.01 hrs, Volume= 0.378 af, Depth> 4.64" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (sf) CN Description 1,590 61 >75% Grass cover, Good, HSG B 190 61 >75% Grass cover, Good, HSG B 2,340 61. >75% Grass cover, Good, HSG B 7,240 85 Gravel roads, HSG B 4,660 85 Gravel roads, HSG B 20,460 98 Paved parking & roofs 6,060 98 Building 42,540 91 Weighted Average 16,020 Pervious Area 26,520 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry,Typical Inspection Subcatchment 1 P: PROPOSED Hydrograph 7 6.81 cfs — Runoff ---r--- --- --------r---r--- ---�--- --------r---r---r------- Ty pe II 24-hr 100 yr - Rainfall=6.00" 5 ---L---1---- ---- ------RU OffAkea�426401sf- Runoff Volume=0.378 of -- 4 --- ----------------- -- -- 3 - ; --- ----Ru'of(De—tha4.4,4"- M 3 -------------------- ---�-- ' --- --- -------- Ic='10�0_rxlin_ 2 1 _ -- : --- 0 1 1 1 1 1 1 1 1 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA-ORONO Type 1124-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here} Page 17 HydroCAD®8.00 s/n 000837 0 2006 HydroCAD Software Solutions LLC 5/18/2009 Subcatchment IS: EXISTING Runoff = 4.50 cfs @ 12.03 hrs, Volume= 0.264 af, Depth> 4.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 yr Rainfall=6.0011 Area (sf) CN Description 1,590 61 >75% Grass cover, Good, HSG B 2,340 61 >75% Grass cover, Good, HSG B 7,240 85 Gravel roads, HSG B 1,360 85 Gravel roads, HSG B 11,760 98 Paved parking & roofs 6,060 98 Building 30,350 90 Weighted Average 12,530 Pervious Area 17,820 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry,Typical Inspection Subcatchment 1S: EXISTING Hydrograph ----------- 4.50 cfs — Runoff I 1 1 I 1 1 I I 1 I I I I I Type II 24-hr h 00 yr _ . Rairifa11=6.00" I I I 1 I 1 I I I I I I RUnaff Asea=30,p50;sf N ' _--�_ I I 1 I I I I I I 3 ------------------- ----Runwff;Vol--O.�6*,af -- I I I I I I I 3 I I I I I I I I I Rupof( Depth�4.54" 1 I I 1 I ° 2 ___}___i__ ,____ TCF42,0_rnrn_ I 1 I I I I I i I I I I I I I I 1 dN=90 I I I I I I I I I I 1 1 I I I I I 1 I I I I I I I I 1 1 I I I 1 I I I 1 I I 1 I 1 I I I 1 I I I I 1 1 I I I I 1 1 I I I I I 1 I 1 I I 1 I I I 1 1 I I I I I I I I i I 1 I I I 1 I I 1 I I 1 I I I I I I I I I I I 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA - ORONO Type 1124-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here} Page 18 HydroCAD®8.00 s/n 000837 0 2006 HvdroCAD Software Solutions LLC 5/18/2009 Reach 1 R: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.697 ac, Inflow Depth > 4.54" for 100 yr event Inflow = 4.50 cfs @ 12.03 hrs, Volume= 0.264 of Outflow = 4.50 cfs @ 12.03 hrs, Volume= 0.264 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1 R: (new Reach) Hydrograph 4.50 cfs — Inflow I I I 1 I 1 1 I 1 - Outflow I I I I 1 I I I 1 I I 1 I 4------------- 4- 3- inflow Aria=�0.6�7c __L___L___ I 1 1 I I I 1 I ! I I I I 1 I 1 I I 1 I I 1 I I I I 1 1 I I I I 1 I 1 I I I I I I I 1 I I I I I I I I 1 I I 1 I 1 I I I I 1 I I 1 1 1 I 1 I 1 I I I 3 I I I I 1 I I I I I I I I M ------ -- ---- ------------ -------------- --- --- q. I I I I 1 I I I I 1 j----T---- - I I I I I 1 I I I I I ! I ! I I I I 1 I I I I I I I 1 O I I I I I I 1 1 I I I I I I I I I I I I I I I I 1 I I I 1 I I I I 1 I I I I I 1 I 1 ! I I I I I I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I 1 1 I I I 1 I I I 1 1 I I I I I I I I I I 1 1 1 I I I I I I 1 I I 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 11586 SPENSA- ORONO Type 11 24-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here} Page 19 HydroCADD 8.00 sh 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 Pond RAIN G: POND 1 [82] Warning: Early inflow requires earlier time span [93] Warning: Storage range exceeded by 1.18' [88] Warning: Qout>Qin may require Finer Routing>1 [85] Warning: Oscillations may require Finer Routing>1 Inflow Area = 0.977 ac, Inflow Depth > 4.64" for 100 yr event Inflow = 6.81 cfs @ 12.01 hrs, Volume= 0.378 of Outflow = 6.83 cfs @ 12.03 hrs, Volume= 0.276 af, Atten= 0%, Lag= 1.1 min Discarded = 0.04 cfs @ 11.90 hrs, Volume= 0.039 of Primary = 6.79 cfs @ 12.03 hrs, Volume= 0.238 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt=0.05 hrs Peak Elev= 1,023.68' @ 12.03 hrs Surf.Area= 3,070 sf Storage=4,430 cf Plug-Flow detention time= 103.4 min calculated for 0.276 of(73% of inflow) Center-of-Mass det. time=41.0 min ( 791.0-750.0) Volume Invert Avail.Storage Storage Description #1 1,020.00' 4,430 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,020.00 530 0 0 1,021.00 1,500 1,015 1,015 1,022.00 2,530 2,015 3,030 1,022.50 3,070 1,400 4,430 Device Routing Invert Outlet Devices #1 Discarded 0.00' 0.600 in/hr Exfiltration over Horizontal area #2 Primary 1,022.50' 2.0' long x 5.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Qiscarded OutFlow Max=0.04 cfs @ 11.90 hrs HW=1,023.33' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=6.49 cfs @ 12.03 hrs HW=1,023.64' (Free Discharge) L2=Broad-Crested Rectangular Weir (Weir Controls 6.49 cfs @ 2.85 fps) d . Y 11586 SPENSA- ORONO Type 1124-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here} Page 20 HydroCAD®8.00 s/n 000837 ©2006 HvdroCAD Software Solutions LLC 5/18/2009 Pond RAIN G: POND 1 Hydrograph 6.79 cfs — Inflow 7 ---1 r---I----I---7---TI---T- - --I---I-'--I----I---1---4--- - Outflow I I I I I I I Infl1woArda=0 I .977 Ac — Discarded 6 I I I I I I I I I I Ppak ;Eley= ,023.68' — Primary I I I I I I I I I I I I I 5 ---;----;----;---;---;---;--- --- ---;Storage=4,4,30-�cf- I 1 1 1 I I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I -- 4 ---I----I----1---1--- --- -- --------'-----I-----------1---- 3 I I I I I I 1 I 1 I I I I I I I I I I I I I I O I I I I I I I 1 _ 3 I 1 I I I I 1 I I I I 1 I I I I I I 1 I I I I I 1 I I I 1 I I 1 I I I I I 1 I 1 I I I I I I I I 2I I I I............ I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I i I I I I I I 1 I I I I I I I I I I I I I I 0.0 I I I I I I I I 1 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours)