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HomeMy WebLinkAbout17 Development Permit 99-289 Landmark 4 PlexesASll lJt BROWNE EJVGIJVEEHIIVG1 IJVC. EneiJieers and Consultants P.O. Box 10838, College Station, Texas 77842 May 10, 1999 Veronica Morgan Asst. City Engineer City of College Station P.O . Box 9960 409-694-2123 Fax: 409-694-3694 College Station , TX 77842 Re : Drainage Report and Plans Check for Univ. Pk . Blk. W (Landmark Homes , Inc.) Dear Ms. Morgan , I have reviewed the above referenced report and plan . The drainage plan and report include all the check listed items and necessary certifications . This report and plan is ready for approval by the City. ~ja2 Ash & Browne Engineering , Inc ).4,IJ1:>'41R:..I<_ f.l~M.~ I h.Jc, Project Name: U , . P~. '&.1< vJ ~.8'. A~ Review Date:. __ 5i~7''--'-1 _0+-..:....L.---­ Reviewer:,_-'G:;;;._,; ...... A~..;;;;~:...i.l"""='c.------- Drainage Reports Location }!; Primary drainage system identified Surrounding developments shown p. Local st.rccts, drainage systems shown Description }i(. Acreage of project ~ Land cover described Primary/sccoodal)' systems within property shown Geocral description Drainage Basins )'( R.cfercnc:cs to FIRMs if applicable Secoodal)' system flow patterns and impact of development on existing system 'jt Proposed pathways to Primary system shown or described Design Criteria ~ Any deviation from standards being requested? Discussion of site constraints and capacities (streets, existing structures, etc .) A)A 0 Discussion of any applicable previous drainage studies and how this plan will affect it H drolo ·c Criteria Rainfall/runoff calculation method described and calculations provided Detention discharge I storage calculation method I calculations Storm rccurrenc:c i.nt.elva1s used I.It 0 Discussion of other drainage facility design criteria used if not referenced in Standards Hydaulic Criteria ti_ Idcotify capacity of systems used Specify velocities at critical points in system Identify detention I retention outlet and routing ~ 0 Discussion of other drainage facility design criteria used not referenced in Standards Drainage Facility Design ~ Diicuss drainage pattcrDS /flows (pre v5. post) Arc they draining water onto another property owner? -if so, is it where the water fiowed before? and is it not more than what flowed there before? and no faster than it flowed before? ~ Discuss erosion control measures employed Discuss detention pond design (sideslope, low flow channels, outlet works, freeboard, emergency spillway) Discuss maintenance access and responsibilities Conclusions Verify compliance with DPDS (signed and sealed certification) Explain effectiveness of improvements with regard to controlling discharges of S -100 year storm by a) Detaining b) Accommodating runoff in existing I proposed casements or ROW discharging into primal)' system c) Combination of a & b 9al12 • Project Name: n\lJAf ~ cvtk ~e-k ~ Review Date: __ tg--+'-lo......,(q......_,q .___ __ _ Reviewer: __ Q.......__~.....;.%..........._ ___ _ Drainage Reports(cont.) Appendices ~ References (all criteria and technical infonnation used) Hydrologic computations Land use assumptions for adjacent property Minor/major storm runoff at specific points Historic/fully developed runoff specific points Hydrographs at critical points Hydraulic computations Culvert capacities (headwater and tailwater assumptions) 0 Storm sewer capacities 0 Street capacities 0 Storm inlet capacities (inlet control rating) 0 Open channel design 'I( Detention area I volume capacity I outlet capacity Attached Drawings 'j5. Location map with drainage patterns O Floodplain map if any Drainage plan with topo (existing and proposed with arrows if needed) Details of outlet structures 10of12 DEVELOPMENT PERMIT PERMIT NO. 99-289 LANDMARKFOURPLEXES FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: BLOCK W UNIVERSITY PARK OWNER: Ronnie White P.O. Box 2666 Bryan, Texas 77802 846-4035 DRAINAGE BASIN: BURTON CREEK SITE ADDRESS: SUMMER COURT TYPE OF DEVELOPMENT:THIS PERMIT IS VALID FOR SITE CONSTRUCTION PER APPROVED PLANS. The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition. placement and state. The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion. siltation or sedimentation resulting from the permitted work. Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities. I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of College Station that apply. Administrator/Representative Date Owner/ Agent Date Contractor Date SITE PLAN REVIEW APPLICATION MINII\1UM REQUIREMENTS ~ Site plan application completed in full. ~ $100.00 application fee . "-.) Ten (10) folded copies of site plan which include requirements for site plan proposals as listed on attached sheet. '-...J A copy of the attached site plan checklist with all items checked off or a brief explanation as to why they are not checked off. I { c-.-;:. . NAME OF JlROJECT .Wt-.1 Di\/\hl2k ttmrs iol)f2 f L9c ~ ltf rt'cv-t ADDRESS VL T LEGALDESCRIPTION_,_._~~-'-'-L.L.-l.-=+--v--=-:.-'---=-----+=--..:=->---uj---------~ RESIDENTIAL Total Acreage D .£2>G. Housing Units _3 __ _ #Bedrooms~ 132 sq. ft. __ ? __ _ #Bedrooms< 132 sq . ft. ___ _ PROJECT MANAGER --------- ADDRESS PHONE FAX ------------ 0 COMMERCIAL Total Acreage Building Square Feet __ _ Floodplain Acreage __ _ PROPERTY OWNER --------- ADDRESS ------------ PHONE FAX ----------- ARCHITECT OR ENGINEER I CHAB l-Co . ADDRESS t&:Jl f U 'ti,V'J1PIL Su "'Z <; :S ~ 6 C. S , Tx ll&l/~o PHONE {/3(3 l (OD FAX 6C?t3 l 07:::, ?RESENT USE OF PROPERTY -~-\..'j'-"g-=p,_._~,.,_J_.___ _______________ _ )ROPOSED USE OF PROPERTY fi?l~ Vl.P L~ [%...u:-: :URRENTZONINGOFPROPERTY--!.12'.-_-_Li=+------------------ / ARIANCE(S) REQUESTED AND REASON(S) __._'N.>.=0-+-~-=(__@_..___f?M"--"-..._'l)_,__-'+-~ ............ d:Xl.~~ ~=---+-!----- -~~-~ G PACES REQUIRED 6~ --- ES PROVIDED ~ P-~' Date ' \ DRAINAGE REPORT LANDMARK HOMES, INC. UNIVERSITY PARK BLOCKW 0.86 ACRES COLLEGE STATION, BRAZOS COUNTY, TEXAS "-0~ ~ "''~\) ~ X:-X:.'1\~~~ '-''~~c ~ o~~ ,~~ 0 ~\\'{ '\. ~J CERTIFICATION I hereby certify that this report and accompanying drainage plan for the drainage design was prepared by me in accordance with the provisions of the Cities Drainage Policy and Design Standards for the owners thereof . By: Michael G . Hester , P .E . Registered Professional Engineer No . 69104 State of Texas UNIVERSITY PARK BLOCK W -CERTIFICATION DRAINAGE REPORT UNIVERSITY PARK BLOCK W COLLEGE STATION, BRAZOS COUNTY, TEXAS APRIL, 1999 INTRODUCTION : The proposed development is located in the University Park Subdivision between Spring Loop and Autumn Circle. The legal description is University Park, Block W and is approximately 0.86 acres. The proposed improvements include pavement , drainage and utility improvements for two fourplexes and one duplex. The site consists of grassland with numerous trees . The terrain slopes in a westerly direction toward an existing drainage channel at an average slope of two percent . The latest Federal Emergenc y Management Agency (FEMA) Flood Insurance Rate Maps (48041CO 14 2 C) shows that a small portion of the tract is in the regulatory 100-year flood plain. The site is zoned MF(multi -family) and is being developed by Mr. Ronny White, Landmark Custom Homes, P.O . Box 2 666 , Br y an, TX 77802 , 409 .846 .4035. EXISTING DRAINAGE BASIN DESCRIPTION : The drainage area consists of approximately 0 .86 acres with the highest point at Summer Court . Approximately 0 . 6 acres o f off site storm runoff enters the tract along the south propert y line. The primary drainage system that the site drains to is Burton Creek, Basin Reference No. 1 which is in the "Special Drainage Basin and Channel Reach Design Standards section of the College Station Drainage Policy and Design Standards and detention is required to the 100 year ultimate storm event . PROPOSED DRAINAGE: • The proposed pavement design will route the runoff along driveways and into a detention basin . The detention basin was designed using the Haestead Methods Pond -2 computer program and will contain the increased runoff from the 2 through the 100 year ultimate storm . • Predevelopment discharges for the 2 , 5 , 10, 25 and 100 year storms were determined using the Haestead Methods Qui c k TR-55 rational method for computing runoff hydrographs . Detai l ed calculations are contained in PREDEVELOPMENT CONDITIONS . • Post-development discharges were determined utilizing the same hydrography methodo l ogy . Detailed calculations are contained in POSTDEVELOPMENT CONDITIONS . Landma r k Homes Fourplex's -Un iversity Pa r k Block W ·Drainage Report · Page 1 of 2 Pag es • Sedimentation is handled by silt fencing as shown on the Site Plan Cl . CONCLUSION: This project is in compliance with the City 's Stormwater Design Standards . Landmark Homes Fourplex 's -University Park Block w · Drainage Report· Page 2 of 2 Pages UNIVERSITY PARK BLOCK W DETENTION BASIN FLOW CALCULATIONS APRIL 27, 1999 0.86 ACRE PRE-DEVELOPMENT CONDITIONS AREA RUNOFF ACRES DESCRIPTION C" PERVIOUS 0 .30 0 .86 POST-DEVELOPMENT CONDITIONS AREA RUNOFF ACRES DESCRIPTION C" PERVIOUS 0 .30 0 .32 IMPERVIOUS 0 .90 0 .54 STORM PRE POST FREQUENCY DEVELOPMENT DEVELOPMENT (CFS) (CFS) 02 1.63 3 .67 05 1.98 4.48 010 2 .23 5 .02 025 2 .54 5 .7 4 0100 3 .00 6 .77 ACTUAL AREA TO BASIN POST-DEVELOPMENT AREA RUNOFF ACRES DESCRIPTION C" PERVIOUS 0 .30 0 .64 IMPERVIOUS 0 .90 0 .65 STORM POST FREQUENCY DEVELOPMENT CCFS> 02 4 .90 05 5 .98 010 6 .71 025 7 .66 0100 9 .04 tc (MIN.) 10 tc CMINJ 10 DELTA INCREASE CCFS> 2.04 2 .50 2 .79 3 .20 3 .77 tc CMINJ 10 ALLOWABLE THROUGH BASIN OUTFALL* (CFS) 2 .86 3.48 3.92 4.46 5 .27 *ALLOWABLE THROUGH BASIN OUTFALL= POST DEVELOPMENT ACTUAL -DEL TA - MAPS & PLANS UNIVERSITY PARK BLOCK W -LANDMARK HOMES FOURPLEX 'S - - LANDSCAPE ANALYSIS . ...,,,....,.=a·erw =~~-=-..._,.......,.__,, ... ,..... TOIH..~-.rT1111t2' 1tn'Ai.l"'l"OflOK0~1200 ..... lHr ___ _.... __ _..._ .. _Clf'" __ .. ___ =7-£...~~=-=-=r-;?~,3~-=-·-= ~~~---.o.u·-­ ~,.:f::r'll.~--­ :iii...""Vllt='.:---:...~---- ::s--=-::--:a ~-== [-J i.:R-"ni-..-nn.."Ol::I = ~~-~"'=­ ~ ~!!:.~EeiF-. I I I I I I I I ~ 400 BUILDING C C1 & C2 PROPOSED DUPLEX 2 ~ BEDROOM =----·----· 16 17 18 19 20 21 22 23 LEGEND ---------- UM MER COURT i'9:ti~ ! f I © ~ ·-Ii i I ...... -------_ .......... ------ 1~1· I ~~ .... -== I LEGEND -~ -~ . =---.. ~ --~ . :-,.:-'---== 275 I I I I I I ~ .. _: I ! I I I > ., __ Uo& I I I I I I .._ :--\:~~ 1i ~~) I ! : DRAINAGE STRUCTURE DS-2 DRAINAGE FLUME DRAINAGE STRUCTURE DS-3 275 PROFILE THROUGH BASIN LOOKING SOUTH =-.-..'IVM.ln' __ _ _,_111 1 ro..o...-~ --.all).,,,,,_._._OT __ _ STANDARD CONCRETE SIDEWALK DETAILS B~-~== •L r -r= -. DRAINAGE FLUME A GENERAL NOTES: """"""' ....... ___ __,,_ ____ ~. mi"rim~.l"'~~ ':/-.-=:"'.~~~-... ~~-· ~~~·-·- """""" ~~A\.~ !.!il'-S.H~..E.. ~~ ='='lo"l:il.'m~-- . £:D4f- PAVEMENT DETAIL ~.~!"" TANGENT SECTIONS "TYPICAL JOINT LAYOUT AND REINFORCEMENT DETAILS _ _.. .. o... • ...,,,..~----­~·1 .. rr.--11,f.<u...-.~ ... T ...... ..o.. .. TYPE '"O'" LONGITUDINAL JOINT =~-=-_,;;:::.~c.-=-~l'Olt.°'"'*9E l!l,-~ TYPICAL COMBINED CONCRETE •l•~.,K'~ -'CURB & GUTTER SECTION _.i_:..--=-2) 1~~i(l=I -n-PE~·G-'"E'x'PA'Ns10N'-~ & CONSTRUCTI ON JOINT ~ ,. 11 Cl.. t :t. .£381 _::::0.: ~'O"™'" °""' -;:; & ~ DRIVEWAY AND PARKING SPACE DETAIL IM't- t :: ~ ---~-,,,. ~- BURIED CONDUIT TRENCH DETAIL DRIVEWAY PAVEMENT DETAILS 'THIS OOCUWENT ts lllll..£llSID !'OR THE PU!ti'OSE or.; R E'-./1 EVV C> NL 'Y UNOOt THC ALmtORITY OF: PRE DEVELOPMENT CONDITIONS UNIVERSITY PARK BLOCK W -LANDMARK HOMES FOURPLEX 'S Quick TR-55 Ver.5.46 Executed: 18:45:46 S/N:l803000009 04-26-1999 LANDMARK HOMES FOURPLEXES PREDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C ' adjustment factor for each return frequency Subarea Descr. PREDEVE. Runoff 'C' 0.300 Area acres 0.86 Tc (min) Wtd. IC' 10.00 0.300 RETURN FREQUENCY = 2 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C ' in/hr 0.300 6.300 Total acres 0.86 Peak Q (cfs) 1.63 Quick TR-55 Ver.5.46 Executed: 18:45:46 S/N:1803000009 04-26-1999 LANDMARK HOMES FOURPLEXES PREDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. PREDEVE . Runoff IC' 0.300 Area acres 0.86 Tc (min) Wtd. 'C' 10.00 0.300 RETURN FREQUENCY = 5 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C' in/hr 0.300 7.690 Total acres 0.86 Peak Q (c fs) 1. 98 Quick TR-55 Ver.5.46 Executed: 18:45:46 S/N:l803000009 04-26-1999 LANDMARK HOMES FOURPLEXES PREDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. PREDEVE. Runoff 'C' 0.300 Area acres 0.86 Tc (min) Wtd. IC' 10.00 0.300 RETURN FREQUENCY = 10 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Adj. I 'C' in/hr 0.300 8.630 Total acres 0.86 Peak Q (cfs) 2.23 Quick TR-55 Ver.5.46 Executed: 18:45:46 S/N:1803000009 04-26-1999 LANDMARK HOMES FOURPLEXES PREDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. PREDEVE. Runoff 'C' 0.300 Area acres 0.86 Tc (min) Wtd. 'C' 10.00 0.300 RETURN FREQUENCY = 25 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C' in/hr 0.300 9.860 Total acres 0.86 Peak Q (cfs) 2.54 Quick TR-55 Ver.5.46 Executed: 18:45:46 S/N:l803000009 04-26-1999 LANDMARK HOMES FOURPLEXES PREDEVELOPMENT CONDITIONS 0 .86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. PREDEVE. Runoff IC' 0.300 Area acres 0.86 Tc (min) Wtd. 'C' 10.00 0.300 RETURN FREQUENCY = 100 years 'C ' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Adj. I 'C' in/hr 0.300 11.640 Total acres 0.86 Peak Q (cfs) 3.00 POST DEVELOPMENT CONDITIONS UNIVERSITY PARK BLOCK W -LANDMARK HOMES FOURPLEX 'S Quick TR-55 Ver.5.46 Executed: 15:12:34 S/N:1803000009 04-27-1999 LANDMARK HOMES FOURPLEXES -UNIVERSITY PARK BLOCK W POST DEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency RETURN FREQUENCY = 2 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Subarea Descr. Runoff 'C' PERVIOUS 0.300 IMPERVIOUS 0.900 Area acres 0.32 0.54 Tc (min) Wtd. IC' 10.00 0.677 Adj. I 'C' in/hr 0.677 6.300 Total acres 0.86 Peak Q (cfs) 3.67 Quick TR-55 Ver.5.46 Executed: 15:12:34 S/N:1803000009 04-27-1999 LANDMARK HOMES FOURPLEXES -UNIVERSITY PARK BLOCK W POST DEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency RETURN FREQUENCY = 5 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 years Subarea Descr. Runoff 'C' PERVIOUS 0.300 IMPERVIOUS 0.900 Area acres 0.32 0.54 Tc (min) Wtd. 'C' 10.00 0.677 ========================= Adj. I 'C' in/hr 0.677 7.690 Total acres 0.86 Peak Q (cfs) 4.48 Quick TR-55 Ver.5.46 Executed: 15:12:34 S/N:1803000009 04-27-1999 LANDMARK HOMES FOURPLEXES -UNIVERSITY PARK BLOCK W POST DEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff 'C' PERVIOUS 0.300 IMPERVIOUS 0.900 Area acres 0.32 0.54 Tc (min) Wtd. 'C' 10.00 0.677 RETURN FREQUENCY = 10 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Adj. I 'C' in/hr 0.677 8.630 Total acres 0.86 Peak Q (cf s) 5.02 Quick TR-55 Ver.5.46 Executed: 15:12:34 S/N:l803000009 04-27-1999 LANDMARK HOMES FOURPLEXES -UNIVERSITY PARK BLOCK W POST DEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff IC' PERVIOUS 0.300 IMPERVIOUS 0.900 Area acres 0.32 0.54 Tc (min) Wtd. 'C' 10.00 0.677 RETURN FREQUENCY = 25 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Adj. I 'C ' in/hr 0.677 9.860 Total acres 0.86 Peak Q (cfs) 5.74 Quick TR-55 Ver.5.46 Executed: 15:12:34 S/N:l803000009 04-27-1999 LANDMARK HOMES FOURPLEXES -UNIVERSITY PARK BLOCK W POST DEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff IC' PERVIOUS 0.300 IMPERVIOUS 0.900 Area acres 0.32 0.54 Tc (min) Wtd. 'C' 10.00 0.677 RETURN FREQUENCY = 100 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C' in/hr 0.677 11.640 Total acres 0.86 Peak Q (cfs) 6.77 Quick TR-55 Ver.5.46 S/N:1803000009 Executed: 18:46:37 04 -26-1999 LANDMARK HOMES FOURPLEXES POSTDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in /hour, A=acres adj = 'C' adjustment factor for each return frequency RETURN FREQUENCY = 2 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Subarea Descr. Runoff 'C' Area acres IMPERVIOUS 0.900 0.65 PERVIOUS 0.300 0.64 Tc (min) Wtd. 'C' Adj. I 'C' in/hr Total acres 10.00 0.602 0.602 6.300 1. 29 LL~uGH p;~:S(~ O.G Av CJFFs11-c.,) Peak Q (cf s) 4.90 Quick TR -55 Ver.5.46 Executed: 18:46:37 S/N:1803000009 04-26-1999 LANDMARK HOMES FOURPLEXES POSTDEVELOPMENT CONDITIONS 0 .86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency RETURN FREQUENCY = 5 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Subarea Descr. Runoff 'C' Area acres Tc (min) Wtd. 'C' Adj. I 'C' in/hr Total acres Peak Q (cfs) IMPERVIOUS 0 .900 PERVIOUS 0 .300 0.65 0.64 10.00 0.602 0.602 7.690 1.29 5 .98 Quick TR-55 Ver.5.46 Executed: 18:46:37 S/N:1803000009 04-26-1999 LANDMARK HOMES FOURPLEXES POSTDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff IC' IMPERVIOUS 0.900 PERVIOUS 0.300 Area acres 0.65 0.64 Tc (min) Wtd. 'C' 10.00 0.602 RETURN FREQUENCY = 10 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C' in/hr 0.602 8.630 Total acres 1. 29 Peak Q (cfs) 6.71 Quick TR-55 Ver.5.46 Executed: 18:46:37 S/N:1803000009 04-26-1999 LANDMARK HOMES FOURPLEXES POSTDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff 'C' IMPERVIOUS 0.900 PERVIOUS 0.300 Area acres 0.65 0.64 Tc (min) Wtd. 'C' 10.00 0.602 RETURN FREQUENCY = 25 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Adj. I 'C' in/hr 0.602 9.860 Total acres 1. 29 Peak Q (cfs) 7.66 Quick TR-55 Ver.5.46 Executed : 18:46:37 S/N:1803000009 04-26-1999 LANDMARK HOMES FOURPLEXES POSTDEVELOPMENT CONDITIONS 0.86 ACRES * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Whe re: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour , A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff 'C' IMPERVIOUS 0.900 PERVIOUS 0.300 Area acres 0.65 0.64 Tc (min) Wtd. I C' 10.00 0.602 RETURN FREQUENCY = 100 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C' in/hr 0. 602 11. 640 Total acres 1. 29 Peak Q (cfs) 9.04 BASIN VOLUME & DRAINAGE STRUCTURE UNIVERSITY PARK BLOCK W • LANDMARK HOMES FOURPLEX 'S POND-2 Version: 5.20 S/N: 1903052002 LANDMARK HOMES FOURPLEXES -UNIVERSITY PARK BLOCK W DETENTION BASIN VOLUMES Elevation (ft) 279.50 280.00 281.00 282.00 283.00 283.50 284.00 Planimeter (sq. in.) 0.00 69.00 307.00 720.00 1,260.00 2,190.00 3,749.00 CALCULATED 04-27-1999 DISK FILE: LM .VOL Planimeter scale: 1 inch Area (sq.ft) 0 69 307 720 1,260 2,190 3,749 Al+A2+sqr(Al*A2) (sq.ft) 0 69 522 1,497 2,932 5,111 8,804 15:41:40 1 ft. * Volume (cubic-ft) 0 12 174 499 977 852 1,467 Volume Sum (cubic-ft) 0 12 185 684 1 ,662 2,514 3 ,981 2 IA= (sq.rt(Areal) + ((Ei-El)/(E2-El))*(sq.rt(Area2)-sq.rt(Areal))) where: El, E2 Ei Areal,Area2 IA Closest two elevations with planimeter data Elevation at which to interpolate area Areas computed for El, E2, respectively Interpolated area for Ei * Incremental volume computed by the Conic Method for Reservoir Volumes. Volume= (1/3) * (EL2-EL1) * (Areal+ Area2 +sq.rt. (Areal*Area2)) where: ELl, EL2 Areal,Area2 Volume Lower and upper elevations of the increment Areas computed for ELl, EL2, respectively Incremental volume between ELl and EL2 Outlet Structure File: LM-CULV .STR POND-2 Version: 5.20 Date Executed: S/N: 1903 052 0 02 Time Executed: *************************************************** LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W DETENTION BASIN OUTFALL STRUCTURE 8" PVC PIPE *************************************************** ***** COMPOSITE OUTFLOW SUMMARY **** Elevation (ft) Q (cf s ) Contributing Structures --------------------------------------------- 279.50 0.0 1 279.75 0.2 1 280 .00 0.5 1 280 .25 1. 0 1 280 .5 0 1. 3 1 280.75 1. 6 1 281.00 1. 8 1 281.25 2.0 1 281 .5 0 2.2 1 281.75 2.4 1 282.00 2.5 1 282.25 2.7 1 282.50 2.8 1 282.75 2.9 1 283.00 3.1 1 283.25 3.2 1 283.50 3.3 1 +2 283.75 5.3 1 +2 284.00 0.0 Outlet Structure File: LM-CULV .STR POND-2 Version: 5.20 Date Executed: S/N: 1903052002 Time Executed: *************************************************** LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W DETENTION BASIN OUTFALL STRUCTURE 8 11 PVC PIPE *************************************************** Outlet Structure File: Planimeter Input File: Rating Table Output File: LM-CULV . STR LM . VOL LM-CULV .PND Min. Elev. (ft) = 279.5 Max. Elev. (ft) = 284 Iner. (ft) Additional elevations (ft) to be included in table: * * * * * * * * * * * * * * * * * * * * * * * * * * ********************************************** SYSTEM CONNECTIVITY ********************************************** Structure CULVERT-CR WEIR-VR No. 1 2 Q Table -> -> Q Table 1 2 Outflow rating table summary was stored in file: LM-CULV .PND .25 Outlet Structure File: LM -CULV .STR POND-2 Version: 5.20 Date Executed: S/N: 1903052002 Time Executed: *************************************************** LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W DETENTION BASIN OUTFALL STRUCTURE 8 11 PVC PIPE *************************************************** >>>>>> Structure No. 1 <<<<<< (Input Data) CULVERT-CR Circular Culvert (With Inlet Control) El elev. (ft) ? E2elev.(ft)? Diam. (ft)? Inv. el.(ft)? Slope (ft/ft)? Tl ratio? T2 ratio? K Coeff .? M Coeff .? c Coeff.? Y Coeff.? Form 1 or 2? Slope factor? 279.50 284.00 0.667 279.50 .01 0.0098 2 .00 0.03980 0.6700 1 -.5 Outlet Structure File: LM-CULV .STR POND-2 Version: 5.20 Date Executed: S/N: 1903052002 Time Executed: *************************************************** LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W DETENTION BASIN OUTFALL STRUCTURE 8 11 PVC PIPE *************************************************** >>>>>> Structure No. 2 <<<<<< (Input Data) WEIR-VR Weir -Vertical Rectangular El elev. (ft)? E2 elev. (ft)? Weir coefficient? Weir elev. (ft)? Length (ft)? Contracted/Suppressed 283.50 284.00 3.083 283.50 5.0 (C/S)? C Outlet Structure File: LM-CULV .STR POND-2 Version: 5.20 Date Executed: S/N: 1903052002 Time Executed: *************************************************** LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W DETENTION BASIN OUTFALL STRUCTURE 8 11 PVC PIPE *************************************************** Outflow Rating Table for Structure #1 CULVERT-CR Circular Culvert (With Inlet Control) ***** INLET CONTROL ASSUMED ***** Elevation (ft) Q (cfs) Computation Messages --------------------------------------------- 279 .50 0 .0 No headwater 279.75 0.2 Equ.l: HW =.25 dc=.181 280.00 0.5 Equ.l: HW =.5 dc=.34 280.25 1. 0 Equ.l: HW =.750 dc=.462 280.50 1. 3 Submerged: HW =1. 0 280.75 1. 6 Submerged: HW =1.25 281.00 1. 8 Submerged: HW =1. 5 281.25 2.0 Submerged: HW =1.75 281.50 2.2 Submerged: HW =2.0 281.75 2.4 Submerged: HW =2 .25 282.00 2.5 Submerged: HW =2 .5 282.25 2.7 Submerged: HW =2.75 282.50 2.8 Submerged: HW =3.0 282.75 2.9 Submerged: HW =3.25 283.00 3.1 Submerged: HW =3.5 283.25 3.2 Submerged: HW =3.75 283.50 3.3 Submerged: HW =4.0 283.75 3.4 Submerged: HW =4 .25 284.00 0.0 E = or > E2=284 .00 Ac=7.700 Ac=.179 Ac=.259 Used Unsubmerged Equ. Form (1) for elev. less than 280.27 ft Used Submerged Equation for elevations greater than 280.37 ft HW=Headwater (ft) dc=Critical depth (ft) Ac=Area (sq.ft) at de Transition flows interpolated from the following values: E1=280.27 ft; Ql=l.O cfs; Dc=.48 ft; E2=280.37 ft; Q2=1.14 cfs Outlet Structure File: LM-CULV .STR POND-2 Version: 5.20 Date Executed: S/N: 1903052002 Time Executed: *************************************************** LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W DETENTION BASIN OUTFALL STRUCTURE 8" PVC PIPE *************************************************** Outflow Rating Table for Structure #2 WEIR-VR Weir -Vertical Rectangular ***** INLET CONTROL ASSUMED ***** Elevation (ft) Q (cfs) Computation Messages --------------------------------------------- 279.50 0.0 E < Inv.El.= 283.5 279.75 0.0 E < Inv.El.= 283.5 280.00 0.0 E < Inv.El.= 283.5 280.25 0.0 E < Inv.El.= 283.5 280.50 0.0 E < Inv.El.= 283.5 280.75 0.0 E < Inv.El.= 283.5 281.00 0.0 E < Inv.El.= 283.5 281.25 0.0 E < Inv.El.= 283.5 281.50 0.0 E < Inv.El.= 283.5 281.75 0.0 E < Inv.El.= 283.5 282.00 0.0 E < Inv.El.= 283.5 282.25 0.0 E < Inv.El.= 283.5 282.50 0.0 E < Inv.El.= 283.5 282.75 0.0 E < Inv.El.= 283.5 283.00 0.0 E < Inv.El.= 283.5 283.25 0.0 E < Inv.El.= 283.5 283.50 0.0 H =0.0 283.75 1. 9 H =.25 284.00 0.0 E = or > E2=284.00 C = 3.083 L (ft) = 5 H (ft) Table elev. -Invert elev. ( 283.5 ft ) Q (cfs) = C * (L-.2H) * (H**l.5) --Contracted Weir STORM ROUTING UNIVERSITY PARK BLOCK W -LANDMARK HOMES FOURPLEX 'S POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 1 Return Freq: 2 years ********************************************************* * * * LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W * * STORM ROUTING * * * * * * * ********************************************************* Inflow Hydrograph: LM2PST .HYD Rating Table file: LM-CULV .PND ----INITIAL Elevation Outflow Storage CONDITIONS---- 279. 50 ft 0.00 cfs O cu-ft GIVEN POND DATA ------------------------------ ELEVATION OUTFLOW STORAGE (ft) (cfs) (cu-ft) ---------------------------- 279.50 0.0 0 279.75 0.2 1 280.00 0.5 11 280.25 1. 0 34 280.50 1. 3 69 280.75 1. 6 118 281.00 1. 8 186 281 .25 2.0 273 281.50 2.2 383 281.75 2.4 520 282.00 2.5 684 282.25 2.7 879 282.50 2.8 1,106 282.75 2.9 1,366 283.00 3.1 1,662 283.25 3.2 2,030 283.50 3.3 2,514 283.75 5.3 3,150 ------------------------------ INTERMEDIATE ROUTING COMPUTATIONS 2S /t (cfs) 0.0 0.0 0.4 1.1 2.3 3.9 6.2 9.1 12.8 17.3 22.8 29.3 36.8 45.5 55.4 67.6 83.8 105.0 2S/t + 0 (cfs) 0.0 0.2 0.9 2.1 3.6 5.5 8.0 11.1 15.0 19.7 25.3 32.0 39.6 48.4 58.5 70.8 87.1 110.3 Time increment (t) = 0.017 hrs. POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Pond File: LM-CULV .PND Inflow Hydrograph: LM2PST .HYD Outflow Hydrograph: 2LMOUT .HYD Page 2 Return Freq: 2 years INFLOW HYDROGRAPH ROUTING COMPUTATIONS TIME (hrs) 0.000 0.017 0 .0 33 0.050 0.067 0.083 0.100 0.117 0.133 0.150 0 .167 0.183 0.200 0.217 0.233 0.250 0.267 0.283 0.300 0.317 0.333 0 .350 0 .367 0 .383 0.400 0.417 0.433 0.450 0.467 0 .483 INFLOW (cfs) 0.00 0.36 0.71 1.07 1.43 1.79 2.14 2.50 2.86 3.22 3.57 3.57 3.57 3.57 3.57 3.57 3.57 3.57 3.57 3.57 3.22 2.86 2.50 2.14 1. 79 1.43 1. 07 0.71 0.36 0.00 Il+I2 (cf s) 0.4 1.1 1. 8 2.5 3.2 3.9 4.6 5.4 6.1 6.8 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 6.8 6.1 5.4 4.6 3.9 3.2 2.5 1.8 1.1 0.4 28/t -0 (cfs) 0.0 -0.2 -0.1 0.0 0.4 1.0 1.9 3.2 4.9 7.0 9.5 12.1 14.5 16.7 18.9 21. 0 23.0 24.8 26.6 28.3 29.6 30.2 30.0 29.2 27.7 25.6 22.9 19.7 16.0 11.8 28/t + 0 (cf s) 0.0 0.4 0.9 1.7 2.5 3.6 4.9 6.6 8.5 11.0 13.8 16.6 19.2 21.6 23.9 26.1 28.2 30.1 32 .0 33.7 35 .1 35.7 35.5 34.7 33.1 30.9 28.1 24.7 20.8 16.3 OUTFLOW (cf s) 0.00 0.26 0.52 0.81 1. 08 1.30 1.51 1. 68 1. 84 1. 99 2.14 2.27 2.38 2.43 2.47 2.52 2.59 2.64 2.70 2.72 2.74 2.75 2.75 2.74 2.71 2.67 2.58 2.49 2.42 2.26 ELEVATION (ft) 279.50 279.80 280.01 280.16 280.32 280.50 280.67 280.85 281.05 281.24 281.42 281.59 281.72 281.83 281.94 282.03 282.11 282.18 282.25 282.31 282 .35 282.37 282.37 282.34 282.29 282.21 282.10 281 .97 281.80 281.57 POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 3 Return Freq: 2 years ****************** SUMMARY OF ROUTING COMPUTATIONS ****************** Pond File: LM-CULV .PND Inflow Hydrograph: LM2PST .HYD Outflow Hydrograph: 2LMOUT .HYD Starting Pond W.S. Elevation 279.50 ft ***** Summary of Peak Outflow and Peak Elevation ***** Peak Inf low Peak Outflow Peak Elevation 3.57 cfs 2.75 cfs 282.37 ft ***** Summary of Approximate Peak Storage ***** Initial Storage Peak Storage From Storm Total Storage in Pond O cu-ft 988 cu-ft 988 cu-ft POND-2 Version: 5.20 S/N: 1903052002 Pond File: LM-CULV .PND Inflow Hydrograph: LM2PST .HYD Outflow Hydrograph: 2LMOUT .HYD Peak Inf low Peak Outflow Peak Elevation 3.57 cfs 2.75 cfs 282.37 ft Page 4 Return Freq: 2 years EXECUTED: 04-27-1999 15:54:47 Flow (cf s) 0 .0 0.5 1. 0 1. 5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 .------l-----l-----1-----1-----1-----1-----1-----l-----l-----1-----1- .05 x * x * .07 x * x * .09 x * x * .1 x * x * .12 x * x * .14 x * x * .15 x * x * .17 x * x * .19 x * x * .2 x * x * .22 x * x * .24 x * x * .26 x * x * .27 x * x * .29 x * x * .31 x * x * .32 x * x * .34 x * x * .36 * * x TIME (hrs) x File: 2LMOUT .HYD Qmax 2.8 cf s * File: LM2PST .HYD Qmax 3.6 cf s POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 1 Return Freq: 5 years ********************************************************* * * * LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W * * STORM ROUTING * * * * * * * ********************************************************* Inflow Hydrograph: LM5PST .HYD Rating Table file: LM-CULV .PND ----INITIAL Elevation Outflow Storage CONDITIONS---- 279. 50 ft 0.00 cfs O cu-ft GIVEN POND DATA ------------------------------ ELEVATION OUTFLOW STORAGE (ft) (cf s) (cu-ft) ---------------------------- 279.50 0 .0 0 279.75 0.2 1 280.00 0.5 11 280.25 1.0 34 280.50 1.3 69 280.75 1.6 118 281.00 1.8 186 281.25 2.0 273 281 .50 2.2 383 281.75 2 .4 520 282.00 2.5 684 282.25 2.7 879 282.50 2.8 1,106 282.75 2.9 1,366 283.00 3.1 1,662 283.25 3.2 2,030 283.50 3.3 2,514 283.75 5.3 3,150 ------------------------------ INTERMEDIATE ROUTING COMPUTATIONS 2S/t (cf s) 0.0 0.0 0.4 1.1 2.3 3.9 6.2 9.1 12.8 17.3 22.8 29.3 36.8 45 .5 55.4 67.6 83.8 105.0 2S/t + 0 (cfs) 0.0 0.2 0.9 2.1 3.6 5.5 8.0 11.1 15.0 19.7 25.3 32.0 39.6 48.4 58.5 70.8 87.1 110.3 Time increment (t) = 0.017 hrs. POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Pond File: LM-CULV .PND Inflow Hydrograph: LM5PST .HYD Outflow Hydrograph: 5LMOUT .HYD Page 2 Return Freq: 5 years INFLOW HYDROGRAPH ROUTING COMPUTATIONS TIME (hrs) 0.000 0.017 0.033 0.050 0.067 0.083 0.100 0.117 0.133 0.150 0.167 0.183 0.200 0.217 0.233 0.250 0.267 0.283 0.300 0.317 0.333 0.350 0.367 0.383 0.400 0.417 0.433 0.450 0.467 0.483 0.500 0.517 0.533 INFLOW (cfs) 0.00 0.40 0.81 1. 21 1. 62 2.02 2.42 2.83 3.23 3.64 4.04 4.04 4.04 4.04 4.04 4.04 4.04 4.04 4.04 4.04 4.04 4.04 4.04 3.64 3.23 2.83 2.42 2.02 1. 62 1. 21 0.81 0.40 0.00 Il+I2 (cfs) 0.4 1. 2 2.0 2.8 3.6 4.4 5.3 6.1 6.9 7.7 8.1 8.1 8.1 8.1 8.1 8.1 8.1 8.1 8.1 8.1 8.1 8.1 7.7 6.9 6.1 5.3 4.4 3.6 2.8 2.0 1. 2 0.4 28/t -0 (cfs) 0.0 -0.1 -0.1 0.1 0.6 1.4 2.6 4.3 6.4 9.1 12.2 15.5 18.6 21.6 24.4 27.1 29.7 32.2 34.7 37.1 39.5 41.8 44.0 45.7 46.6 46.7 46.0 44.6 42.4 39.5 35.9 31. 6 26.6 28/t + 0 (cfs) 0.0 0.4 1.1 1. 9 2.9 4.2 5.9 7.9 10.4 13.3 16.8 20.3 23.6 26.7 29.7 32.5 35.2 37.8 40.3 42.8 45.2 47.5 49.8 51.7 52.6 52.7 52.0 50.5 48.2 45.3 41.6 37.1 32.0 OUTFLOW (cfs) 0.00 0.27 0.57 0.92 1.16 1.40 1.63 1.79 1.95 2.11 2.28 2.41 2.47 2.54 2.63 2.71 2.74 2.78 2.81 2.84 2.86 2.89 2.93 2.96 2.98 2.98 2.97 2.94 2.90 2.86 2.82 2.77 2.70 ELEVATION (ft) 279.50 279.81 280.04 280.21 280.39 280.58 280.79 280.99 281.19 281.39 281.59 281.78 281.92 282.05 282.16 282.27 282.35 282.44 282.52 282.59 282.66 282.72 282.79 282.83 282.85 282.86 282.84 282.80 282.74 282.66 282.55 282.42 282.25 POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 3 Return Freq: 5 years ****************** SUMMARY OF ROUTING COMPUTATIONS ****************** Pond File: LM -CULV .PND Inflow Hydrograph: LM5PST .HYD Outflow Hydrograph: 5LMOUT .HYD Starting Pond W.S. Elevation 279.50 ft ***** Summary of Peak Outflow and Peak Elevation ***** Peak Inf low Peak Outflow Peak Elevation 4.04 cfs 2.98 cfs 282.86 ft ***** Summary of Approximate Peak Storage ***** Initial Storage Peak Storage From Storm Total Storage in Pond O cu-ft 1,491 cu-ft 1,491 cu-ft POND-2 Version: 5.20 S/N: 1903052002 Pond File: LM-CULV .PND Inflow Hydrograph: LM5PST .HYD Outflow Hydrograph: 5LMOUT .HYD Peak Inf low Peak Outflow Peak Elevation 4.04 cfs 2.98 cfs 282.86 ft Page 4 Return Freq: 5 years EXECUTED: 04-27 -1999 15:54:47 ) .05 .07 .09 .1 .12 .14 .15 .17 .19 .2 .22 .24 .26 .27 .29 .31 .32 .34 .36 x * Flow (cfs) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 .------1-----l-----1-----1-----1-----1-----1-----1-----1-----1 -----1- x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * TIME (hrs) File: 5LMOUT .HYD Qmax 3.0 cf s File: LM5PST .HYD Qmax 4.0 cf s POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04 -2 7-1999 15:54:47 Page 1 Return Freq: 10 years ********************************************************* * * * LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W * * STORM ROUTING * * * * * * * ********************************************************* Inflow Hydrograph: LMlOPST .HYD Rating Table file: LM-CULV .PND ----INITIAL Elevation Outflow Storage CONDITIONS---- 279. 50 ft 0.00 cfs O cu-ft GIVEN POND DATA ------------------------------ ELEVATION OUTFLOW STORAGE (ft) (c f s) (cu-ft) ---------------------------- 279.50 0.0 0 279.75 0.2 1 280.00 0.5 11 280.25 1.0 34 280.50 1.3 69 280 .75 1.6 118 281.00 1. 8 186 281.25 2.0 273 281.50 2.2 383 281.75 2.4 520 282.00 2.5 684 282.25 2.7 879 282.50 2.8 1,106 282.75 2.9 1,366 283.00 3.1 1,662 283.25 3.2 2,030 283.50 3.3 2,514 283.75 5.3 3,150 ------------------------------ INTERMEDIATE ROUTING COMPUTATIONS 2S/t (cf s) 0.0 0.0 0.4 1.1 2.3 3.9 6.2 9.1 12.8 17.3 22.8 29.3 36.8 45.5 55.4 67.6 83.8 105.0 2S/t + 0 (cfs) 0.0 0.2 0.9 2.1 3.6 5.5 8.0 11.1 15.0 19.7 25 .3 32.0 39.6 48.4 58.5 70.8 87.1 110.3 Time increment (t) = 0.017 hrs. POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Pond File: LM-CULV .PND Inflow Hydrograph: LMlOPST .HYD Outflow Hydrograph: lOLMOUT .HYD Page 2 Return Freq: 10 years INFLOW HYDROGRAPH ROUTING COMPUTATIONS TIME (hrs) 0.000 0 .017 0.033 0 .050 0 .067 0.083 0 .1 00 0.117 0.133 0.150 0.167 0.183 0.200 0 .217 0 .233 0 .250 0.267 0.283 0.300 0.317 0.333 0.350 0.367 0.3 83 0.400 0.417 0.433 0.450 0.467 0.483 0.500 0.517 0.533 0.550 0.567 INFLOW (cf s) 0.00 0.44 0.87 1. 31 1. 75 2.18 2.62 3.06 3.49 3.93 4.37 4.37 4.37 4.37 4.37 4 .37 4.37 4.37 4.37 4.37 4 .37 4.37 4.37 4.37 4.37 3.93 3.49 3.06 2.62 2.18 1.75 1.31 0.87 0.44 0.00 Il+I2 (cfs) 0.4 1.3 2 .2 3.1 3.9 4.8 5.7 6.6 7.4 8.3 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.3 7.4 6.6 5.7 4.8 3.9 3.1 2.2 1. 3 0.4 28/t -0 (cf s) 0.0 -0.1 -0.1 0.1 0.8 1.7 3.2 5.1 7.6 10.6 14.2 18.0 21.7 25 .1 28.4 31. 6 34.7 3 7 .8 40.8 43.7 46.5 49.1 51. 7 54 .2 56.7 58.7 59.8 60.0 59.3 57.9 55.5 52.4 48.5 44.0 38.7 28/t + 0 (cf s) 0.0 0 .4 1.2 2.1 3.2 4.7 6.5 8.9 11. 7 15.1 18.9 23 .0 26.8 30.4 33.9 37.2 40.4 43.5 46.5 49.5 52.4 55.2 57.9 60.4 62.9 65.0 66 .1 66 .3 65.7 64.1 61. 8 58.6 54.6 49.8 44.4 OUTFLOW (cfs) 0.00 0.29 0.61 0.99 1. 22 1.47 1. 68 1. 86 2.03 2.20 2.37 2.46 2.54 2.65 2.72 2.77 2.81 2.84 2.88 2.92 2.98 3.03 3.09 3.12 3.14 3.15 3.16 3.16 3.16 3.15 3.13 3.10 3.02 2.93 2.85 ELEVATION (ft) 279.50 279.83 280.06 280.25 280.43 280.64 280.85 281.07 281.29 281.50 281.71 281.89 282.05 282.19 282 .31 282.42 282.52 282.61 282.70 282.78 282.85 282.92 282.98 283.04 283.09 283.13 283.15 283.16 283.15 283 .1 1 283.07 283.00 282.90 282.79 282.64 POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 3 Return Freq: 10 years ****************** SUMMARY OF ROUTING COMPUTATIONS ****************** Pond File: LM-CULV .PND Inflow Hydrograph: LMlOPST .HYD Outflow Hydrograph: lOLMOUT .HYD Starting Pond W.S. Elevation 279.50 ft ***** Summary of Peak Outflow and Peak Elevation ***** Peak Inf low Peak Outflow Peak Elevation 4.37 cfs 3.16 cfs 283.16 ft ***** Summary of Approximate Peak Storage ***** Initial Storage Peak Storage From Storm Total Storage in Pond O cu-ft 1,895 cu-ft 1,895 cu-ft POND-2 Version: 5.20 S/N: 1903052002 Pond File: LM-CULV .PND Inflow Hydrograph: LMlOPST .HYD Outflow Hydrograph: lOLMOUT .HYD Peak Inf low Peak Outflow Peak Elevation 4.37 cfs 3.16 cfs 283.16 ft Page 4 Return Freq: 10 years EXECUTED: 04-27-1999 15:54:47 .05 .07 .09 .1 .12 .14 .15 .17 .19 .2 .22 .24 .26 .2 7 .29 .31 .32 .34 .36 x * Flow (cfs) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 .------1-----1-----l-----l-----l -----l-----l-----l-----l-----l-----I- x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * TIME (hrs) File: lOLMOUT .HYD Qmax 3.2 cf s File: LMlOPST .HYD Qmax 4.4 cf s POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04 -27-1999 15:54:47 Page 1 Return Freq: 25 years ********************************************************* * * * LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W * * STORM ROUTING * * * * * * * ********************************************************* Inflow Hydrograph: LM25PST .HYD Rating Table file: LM-CULV .PND ----INITIAL Elevation Outflow Storage CONDITIONS---- 279. 50 ft 0.00 cfs O cu-ft GIVEN POND DATA ------------------------------ ELEVATION OUTFLOW STORAGE (ft ) (cf s) (cu-ft) ---------------------------- 279.50 0.0 0 279.75 0.2 1 280.00 0.5 11 280.25 1. 0 34 280.50 1. 3 69 280.75 1. 6 118 281.00 1.8 186 281.25 2.0 273 281.50 2.2 383 281.75 2.4 520 282.00 2.5 684 282.25 2.7 879 282 .50 2.8 1,106 282.75 2.9 1,366 283.00 3.1 1,662 283.25 3.2 2,030 283.50 3.3 2,514 283.75 5.3 3,150 ------------------------------ INTERMEDIATE ROUTING COMPUTATIONS 2S/t (cf s) 0.0 0.0 0.4 1.1 2.3 3.9 6.2 9.1 12.8 17.3 22.8 29.3 36.8 45.5 55.4 67.6 83.8 105.0 2S/t + 0 (cfs) 0.0 0.2 0.9 2.1 3.6 5.5 8.0 11.1 15.0 19.7 25.3 32.0 39.6 48.4 58 .5 70.8 87.1 110.3 Time increment (t) = 0.017 hrs. POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Pond File: LM-CULV .PND Inflow Hydrograph: LM25PST .HYD Outflow Hydrograph: 25LMOUT .HYD Page 2 Return Freq: 25 years INFLOW HYDROGRAPH ROUTING COMPUTATIONS TIME (hrs) 0.000 0.017 0.033 0.050 0.067 0.083 0.100 0.117 0.133 0.150 0.167 0.183 0.200 0.217 0.233 0.250 0.267 0.283 0.300 0.317 0.333 0.350 0.367 0.383 0.400 0.417 0.433 0.450 0.467 0.483 0.500 0.517 0.533 0.550 0.567 INFLOW (cfs) 0.00 0.50 1. 00 1. 50 2.00 2.51 3.01 3.51 4.01 4.51 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 5.01 4.51 4.01 3.51 3.01 2.51 2.00 1.50 1. 00 0.50 0.00 Il+I2 (cfs) 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.0 10 .0 10 .0 10 .0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 9.5 8.5 7.5 6.5 5.5 4.5 3.5 2.5 1.5 0.5 28/t -0 (cf s) 0.0 -0.1 -0.0 0.3 1.2 2.4 4.4 6.9 10.1 13.9 18.5 23.3 27.9 32 .4 36.7 41. 0 45.1 49.1 52.9 56.6 60.3 63.9 67.5 71.1 74.5 77 .5 79.4 80.4 80.3 79.2 77.2 74.1 70.2 65.3 59.4 28/t + 0 (cfs) 0.0 0.5 1.4 2.5 3.8 5.7 8.0 10.9 14.4 18.6 23.4 28.5 33.3 37.9 42.4 46.7 51.0 55.1 59.1 62.9 66.6 70.3 74.0 77.5 81.1 84.1 86.0 87.0 86.9 85.8 83.7 80.7 76.6 71.7 65.8 OUTFLOW (cfs) 0.00 0.32 0.69 1.07 1.34 1.61 1.80 1.99 2.17 2.35 2.47 2.60 2.72 2.78 2.83 2.88 2.95 3.03 3.10 3.14 3.17 3.20 3.22 3.24 3.26 3.28 3.29 3.30 3.30 3.29 3.28 3.26 3.24 3.21 3.16 ELEVATION (ft) 279.50 279.85 280.10 280.31 280.53 280.76 281.00 281.23 281.47 281.69 281.92 282.12 282.29 282.44 282.58 282.70 282.81 282.92 283.01 283.09 283.16 283.24 283.30 283.35 283.41 283.45 283.48 283.50 283.50 283.48 283.45 283.40 283.34 283.26 283.15 POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 3 Return Freq: 25 years ****************** SUMMARY OF ROUTING COMPUTATIONS ****************** Pond File: LM-CULV .PND Inflow Hydrograph: LM25PST .HYD Outflow Hydrograph: 25LMOUT .HYD Starting Pond W.S. Elevation 279.50 ft ***** Summary of Peak Outflow and Peak Elevation ***** Peak Inf low Peak Outflow Peak Elevation 5.01 cfs 3.30 cfs 283.50 ft ***** Summary of Approximate Peak Storage ***** Initial Storage Peak Storage From Storm Total Storage in Pond 0 cu-ft 2,510 cu-ft 2,510 cu-ft POND-2 Version: 5.20 S/N: 1903052002 Pond Fi le : LM-CULV .PND Inflow Hydrograph: LM25PST .HYD Outflow Hydrograph: 25LMOUT .HYD Peak Inf low Peak Outflow Peak Elevation 5.01 cfs 3.30 cfs 283.50 ft Page 4 Return Freq: 25 years EXECUTED: 04-27 -1999 15:54:47 .05 .07 .09 .1 .12 .14 .15 .17 .19 . 2 .22 .24 .26 .27 .29 .31 .32 .34 .36 x * Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9 .0 10.0 11.0 .------1-----1-----l-----l-----l-----l-----l -----l-----l -----l-----I- x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * TIME (hr s) File: 25LMOUT .HYD Qmax 3.3 cf s File: LM25PST .HYD Qmax 5 .0 cf s POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 1 Return Freq: 100 years ********************************************************* * * * LANDMARK HOMES FOURPLEX'S -UNIVERSITY PARK BLOCK W * * STORM ROUTING * * * * * * * ********************************************************* Inflow Hydrograph: LMlOOPST.HYD Rating Table file: LM-CULV .PND ----INITIAL Elevation Outflow Storage CONDITIONS---- 279. 50 ft 0.00 cfs 0 cu-ft GIVEN POND DATA ------------------------------ ELEVATION OUTFLOW STORAGE (ft) (cf s) (cu-ft) ---------------------------- 279.50 0.0 0 279.75 0.2 1 280.00 0.5 11 280.25 1. 0 34 280.50 1. 3 69 280.75 1. 6 118 281.00 1. 8 186 281.25 2.0 273 281.50 2.2 383 281.75 2.4 520 282.00 2.5 684 282.25 2.7 879 282.50 2.8 1,106 282.75 2.9 1,366 283.00 3.1 1,662 283.25 3.2 2,030 283.50 3.3 2,514 283.75 5.3 3,150 ------------------------------ INTERMEDIATE ROUTING COMPUTATIONS 2S/t (cf s) 0 .0 0 .0 0.4 1.1 2.3 3.9 6.2 9.1 12.8 17.3 22.8 29.3 36.8 45 .5 55 .4 67.6 83.8 105.0 2S/t + 0 (cfs) 0.0 0.2 0.9 2.1 3.6 5.5 8.0 11.1 15.0 19.7 25.3 32.0 39 .6 48 .4 58.5 70.8 87.1 110.3 Time increment (t) = 0.017 hrs. POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Pond File: LM-CULV .PND Inflow Hydrograph: LMlOOPST.HYD Outflow Hydrograph: lOOLMOUT.HYD Page 2 Return Freq: 100 years INFLOW HYDROGRAPH ROUTING COMPUTATIONS TIME (hrs) 0.000 0.017 0.033 0.050 0.067 0.083 0.100 0.117 0.133 0.150 0.167 0.183 0.200 0.217 0.233 0.250 0.267 0.283 0.300 0.317 0.333 0.350 0.367 0.383 0.400 0.417 0.433 0.450 0.467 0.483 0.500 0.517 0.533 0.550 0.567 0.583 INFLOW (cfs) 0.00 0.58 1.16 1.74 2.32 2.91 3.49 4.07 4.65 5.23 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.81 5.23 4.65 4.07 3.49 2.91 2.32 1.74 1.16 0.58 0.00 Il+I2 (cf s) 0.6 1.7 2.9 4.1 5.2 6.4 7.6 8.7 9.9 11.0 11.6 11.6 11. 6 11.6 11.6 11.6 11.6 11. 6 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.0 9.9 8.7 7.6 6.4 5.2 4.1 2.9 1.7 0.6 28/t -0 (cfs) 0.0 -0.1 0.0 0.6 1.7 3.5 6.1 9.4 13.4 18.4 24.2 30.3 36.3 42.1 47.7 53.1 58.4 63.7 68.8 73.9 79.0 83.4 87.0 90.1 92.6 94.6 95.9 95.9 95.0 93.3 90.9 88.0 84.6 80.8 76.0 70.1 28/t + 0 (cfs) 0.0 0.6 1.6 2.9 4.7 7.0 9.9 13.6 18.1 23.3 29.4 35.8 41. 9 47.9 53.7 59.3 64.7 70.1 75.3 80.5 85.6 90.6 95.0 98.7 101.7 104.2 105.7 105.7 104.6 102.6 99.7 96.2 92.1 87.5 82.6 76.6 OUTFLOW (cf s) 0.00 0.36 0.79 1.16 1.46 1. 72 1. 93 2.13 2.33 2.46 2.62 2.75 2.83 2.89 3.01 3.11 3.15 3.19 3.23 3.26 3.29 3.60 3.98 4.30 4.56 4.77 4.90 4.91 4.81 4.64 4.39 4.08 3.73 3.34 3.27 3.24 ELEVATION (ft) 279.50 279.88 280.14 280.39 280.64 280.90 281.16 281.41 281.66 281.91 282.15 282.37 282.56 282.74 282.88 283.02 283.13 283.23 283.32 283.40 283.48 283.54 283.59 283.62 283.66 283.68 283.70 283.70 283.69 283.67 283.64 283.60 283.55 283.50 283.43 283.34 POND-2 Version: 5.20 S/N: 1903052002 EXECUTED: 04-27-1999 15:54:47 Page 3 Return Freq: 100 years ****************** SUMMARY OF ROUTING COMPUTATIONS ****************** Pond File: LM-CULV .PND Inflow Hydrograph: LMlOOPST.HYD Outflow Hydrograph: lOOLMOUT.HYD Starting Pond W.S. Elevation 279.50 ft ***** Summary of Peak Outflow and Peak Elevation ***** Peak Inflow Peak Outflow Peak Elevation 5.81 cfs 4.91 cfs 283.70 ft ***** Summary of Approximate Peak Storage ***** Initial Storage Peak Storage From Storm Total Storage in Pond O cu-ft 3,026 cu-ft 3,026 cu-ft POND-2 Version: 5.20 S/N: 1903052002 Pond File: LM-CULV .PND Inflow Hydrograph: LMlOOPST.HYD Outflow Hydrograph: lOOLMOUT.HYD Peak Inf low Peak Outflow Peak Elevation 5.81 cfs 4.91 cfs 283.70 ft Page 4 Return Freq : 100 years EXECUTED: 04-27-1999 15:54:47 .05 .07 .09 .1 .12 .14 .15 .1 7 .19 . 2 .22 .24 .26 .27 .29 .31 .32 .34 .36 x * Flow (cfs) 0 .0 1 .0 2.0 3.0 4.0 5.0 6.0 7 .0 8 .0 9.0 10.0 11.0 .------1-----1-----1-----1-----1-----1-----1-----1-----1-----1-----1 - x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * x * TIME (hrs) File: lOOLMOUT.HYD Qmax 4.9 cf s File: LMlOOPST.HYD Qmax 5.8 cf s SUPPLEMENTAL DEVELOPMENT PERMIT INFORMATION Application is hereby made for the following development specific waterway alterations: No~ It:. ACKNOWLEDGMENTS: 1,f1'4J4Qi. Q . ~e £:-; design engineer/owner, hereby ac1<now1edgc ., aflinn that: The information and conclusions :O~ in the above plans and supporting documents comply with the current requirements of the City of College Station, Texas City Code. Chapter 13 and its associated Drainage Policy and Design Standards. As a condition of approval of this permit application, I agree to construct the improvements proposed in this application according to these documents and the requirements of Chapter 13 of the College Station City Code. Property Owner(s) Contractor CERTIFICATIONS: (for proposed alterations within designated flood harnd areas.) ~ I. certify that any nonresidential structure on or proposed to be on this site as part of this application is designated to prevent damage to the structure or its contents as a result of flooding from the 100 year storm. Engineer Date N~· I. certify that the finished floor elevation of the lowest floor, including any basement, of any residential structure, proposed as part of this application is at or above the base flood elevation established in the latest Federal Insurance Administration Flood Hazard Study and maps. as amended. Engineer Date NA-c. I, certify that the alterations or development covered by this permit shall not diminish the flood-carrying capacity of the waterway adjoining or crossing this permitted site and that such alterations or development are consistent with requirements of the City of College Station City Code, Chapter 13 concerning encroachments of floodways and of floodway fringes. · , Engineer · Date ~-L do certify that the proposed alterations do not raise the level of the 100 year flood above elevation established in the latest Federal Insurance Administration Flood Ha7.ard Study. Engineer Date Conditions or comments as part of approval:--------------------------- In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities. r hereby grant this permit for development. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer for the above named project. All of the applicable codes and ordinances of the City of College Station shall apply. SITE PLAN APPLICATION SITEAPP.DOC 03/'25199 3 of3