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HomeMy WebLinkAboutContract 47963 Of1 ` DECEIVED CITY SECRETARY [/ 1 ��� JUL 12 2016 CONTRACT N0. 1" 11TOFF0RT PE# 0�`StY STORM WATER FACILITY MAINTENANCE AGREEMENT THIS AGREEMENT, made and entered into this day ofd, Op P:L-- 1� 21P1 C� , by and between rV12 1 A1Ug][L4 I5© acting by and through �� E _jf/J, hereinafter referred to as "Landowner", and the City of Fort Worth, hereinafter referred to as"City". WITNESSETH WHEREAS, the Landowner is the owner of certain real property described as an approximately 44.51 ACRES, LOTS 1 & 2, LOWERY ROAD SCHOOL SITE located in the JOHN THRESHER SURVEY, ABSTRACT No. 1870, Tarrant County, Texas according to the deed recorded in CABINET A, SLIDE 5394, Deed Records, Tarrant County, Texas, hereinafter called the "Property". WHEREAS, the Landowner is proceeding to build on and develop the Property according to the Site Plan/Subdivision Plan known as LOWERY ROAD ELEMENTARY SCHOOL ADDITION AND RENOVATION HEREINAFTER called the "Plan", which is expressly made a part hereof, as approved or to be approved by the City and the Landowner provides for management of storm water within the confines of the Property; and WHEREAS, the City and the Landowner, and their successors and assigns, agree that the health, safety and welfare of the residents of the City of Fort Worth, Texas require that on-site Storm Water Management Facilities be constructed and maintained on a portion of the Property; and OFFICIAL RECORD CITY SECRETARY STORM WATER FACILITY MAINTENANCE AGREEMENT FT. WORTH TX 1 Rev.09/10/2012 9 WHEREAS, the City requires that on-site Storm Water Management Facilities ("Facility") as shown on the Plan be constructed and adequately maintained by the Landowner, its successors and assigns, the location and dimensions of which is shown and more particularly described by metes and bounds in the attached Exhibit "A" ("Facility Property"); and NOW, THEREFORE, in consideration of the foregoing premises, the mutual covenants contained herein, and the following terms and conditions, the parties hereto agree as follows: 1. The Landowner, its successors and assigns, shall adequately construct and maintain the on-site Storm Water Management Facility ("Facility") at no expense to the City of Fort Worth in accordance with the design specifications for the Facility, attached as Exhibit "B", and the current standards then in force and effect in the City of Fort Worth and with the Operations and Maintenance Plan attached to this Agreement as Exhibit "C". The Storm Water Facility includes all pipes, channels or other conveyances built to convey storm water to the facility, as well as all structures, improvements, and vegetation provided to control the quantity and quality of the storm water. Adequate maintenance is herein defined as good working condition so that these facilities are performing their design functions. The Storm Water Structural Control Maintenance Checklists, attached to this Agreement as Exhibit "D", are to be used to establish what good working condition is acceptable to the City. 2. The Landowner, its successors and assigns, shall inspect the Facility and submit an inspection report to the City annually. The purpose of the inspection is to assure safe and proper functioning of the Facility. The inspection shall cover the entire Facility, berms, outlet structure, pond areas, access roads, etc. Components of the Facility, which need maintenance or replacement to perform their design function, shall be noted in the inspection report along with the corrective actions to be taken. STORM WATER FACILITY MAINTENANCE AGREEMENT 2 Rev.09/10/2012 3. The Landowner, its successors and assigns, hereby grant permission to the City, its authorized agents and employees, to enter upon the Property and to inspect the Facility Property whenever the City deems necessary. The purpose of inspection is to follow-up on reported deficiencies and/or to respond to citizen complaints. The City shall provide the Landowner, its successors and assigns, copies of the inspection findings and a directive to commence with the repairs if necessary. 4. In the event the Landowner, its successors and assigns, fails to maintain the Facility in good working condition as specified herein, the City, its authorized agents and employees, may enter upon the Facility Property and take whatever steps necessary to correct deficiencies identified in the inspection report and to charge the costs of such repairs to the Landowner, its successors and assigns. It is expressly understood and agreed that the City is under no obligation to routinely maintain or repair said Facility, and in no event shall this Agreement be construed to impose any such obligation on the City, such obligation is Landowner's. 5. The Landowner, its successors and assigns, will perform the work necessary to keep the Facility in good working order as appropriate. In the event the City pursuant to this Agreement, performs work of any nature, or expends any funds in performance of said work for labor, use of equipment, supplies, materials, and the like, the Landowner, its successors and assigns, shall reimburse the City upon demand, within thirty (30) days of receipt thereof for all actual costs incurred by the City hereunder. In the event that Landowner or its successors or assigns fail to pay the City for the costs incurred under this section, the City shall impress a lien for the costs of such work upon other lots owned by the Landowner. Such lien shall be perfected by filing in the office of the County Clerk of Tarrant County, Texas an affidavit identifying the property to be charged with such lien, stating the amount thereof, and making reference to this Agreement. 6. This Agreement imposes no liability of any kind whatsoever on the City. THE LANDOWNER AGREES TO HOLD THE CITY HARMLESS FROM STORM WATER FACILITY MAINTENANCE AGREEMENT 3 Rev.09/10/2012 ANY LIABILITY IN THE EVENT THE FACILITY FAILS TO OPERATE PROPERLY. LANDOWNER COVENANT AND AGREE AND DOES HEREBY INDEMNIFY, HOLD HARMLESS AND DEFEND THE CITY OF FORT WORTH, ITS AGENTS, SERVANTS AND EMPLOYEES FROM AND AGAINST ALL COSTS, EXPENSES, LOSSES, DAMAGES, CLAIMS OR CAUSES OF ACTION WHATSOEVER ARISING, OR WHICH MIGHT ARISE, FROM THE FAILURE OF LANDOWNER OR ANY FUTURE OWNERS OF THE ABOVE FACILITITY PROPERTY TO PNAINTAIN THE FACILITY, INCLUDING, BUT NOT LIMITED TO THE BED AND BANKS OF THE DETENTION POND; ANY DAMAGES CAUSED TO PERSON OR PROPERTY DUE TO (1) FLOODING OF THE POND AND ITS BANKS, (2) SLOPE FAILURE OF THE BANKS OF THE POND, OR (3) FAILURE OF THE POND OR ITS BANKS TO OPERATE IN A MANNER CONSISTENT WITH CITY OF FORT WORTH CRITERIA TO PERFORM ANY OTHER DUTIES OR OBLIGATIONS HEREUNDER. 7. Landowner covenants and agrees that no habitable building shall be erected within the drainage easement outlined on Exhibit "A" but this paragraph shall not preclude construction of other improvements within the drainage easement, which do not impede drainage. Landowner covenants and agrees that no habitable building shall be erected on the above property abutting such easement which shall have a finished floor at an elevation less than two feet above the maximum depth of water in the detention pond which would occur during a 100 year frequency flood. 8. This Agreement shall be recorded among the land records of Tarrant County, Texas, shall constitute a covenant running with the land, and shall be binding on the Landowner, its administrators, executors, assigns, heirs and any other successors in interests, including any property owners association. STORM WATER FACILITY MAINTENANCE AGREEMENT 4 Rev 09/10/2012 [SIGNATURE PAGE FOLLOWS] Executed this 24-( day of ou5 Landowner City of Fort Worth Name: M:T-S(&S C-"P4 Assistant City Manager Title: �Q-r� pI"e S j Cl�2�*" Approved as to Form and Legality Assistant City Attorney, N 42 IV,643 gt*-- ATTEST FORS S� 0 ity Sec e �X S N RECORD RETARY TFI, TX STORM WATER FACILITY MAINTENANCE AGREEMENT 5 Rev.09/10/2012 STATE OF TEXAS § COUNTY OF TARRANT § This instrument was acknowledged before me on 00 by kS C�flflf� Fer-na m � Assistant City Manager of the City of Fort Worth, on behalf of the City of Fort Worth. TRIKINYA l JOHNSON / r Notary Public,State of Texas -'"Z Comm.Expires 04-17-2018 Notary Pub ' , State of exas °; Notary ID 1238832-0 STATE OF TEXAS § COUNTY OF TARRANT § Before me, the undersigned authority on this 2-4 kk day of 5c40 r y-,r V , 20-(g' personally appeared C'� IMAh �o�7biY�5 , �re.s �der � known to me to be the person whose name is subscribed to the foregoing instrument and acknowledged to me that the, same is the act of ere s;� _. Y\'�, PJ�r A l.-f E1 v c�4 c,J and that he executed the same as its Q;asZAc.n 4� and as the act of such IlJ1S and for the purposes and consideration expressed in the foregoing instrument. NpIN/NN/M .� h» Notary P ic, State of Texas DAMiE - ,, ry _ ?O Olt s CK- �pNNN111MN OFFICIAL RECORD CITY SECRETARY FT. WORTH, TX STORM WATER FACILITY MAINTENANCE AGREEMENT 6 Rev.09/10/2012 EXHIBIT "A" STORM WATER FACILITY MAINTENANCE AGREEMENT 7 Rev.09/10/2012 EXHIBIT "A-2" STORM WATER FACILITY Detention Pond Maintenance Area BEING a 31,027 square foot tract of land situated in the John Thresher Survey, Abstract No. 1870 Tarrant County, Texas, and being a part of Lot 1 of the Lowery Road School Site, an addition to the City of Fort Worth, Texas, as recorded in Cabinet A, Slide 5394, of the Plat Records of Tarrant County, Texas (P.R.T.C.T.), and being a part of a called 47-30/100 acre tract of land described in deed to The Fort Worth Independent School District, Fort Worth, Texas, as recorded in Volume 5064, Page 615, of the Deed Records of Tarrant County, Texas (D.R.T.C.T.), and being more particularly described as follows: COMMENCING at a 5/8-inch found iron rod with yellow plastic cap stamped "BROOKES BAKER" (controlling monument) at the southerly end of a radial comer dip at the intersection of the south right-of-way line of Lowery Road (a variable width right-of-way) and the west right- of-way line of Cooks Lane (a variable width right-of-way), said point being the beginning of a circular curve to the left having a radius of 50.00 feet and whose chord bears North 68 degrees 09 minutes 36 seconds West, 37.90 feet, from which point a 1/2-inch found iron rod (controlling monument) bears South 26 degrees 44 minutes 24 seconds East, 887.86 feet; THENCE Northwesterly, and along said curve through a central angle of 44 degrees 32 minutes 30 seconds for an arc distance of 38.87 feet to the point of tangency; THENCE South 89 degrees 34 minutes 09 seconds West, along the south right-of-way line of said Lowery Road, a distance of 159.30 feet to the POINT OF BEGINNING of the herein described tract of land; THENCE the following courses and distances along the perimeter of a detention pond maintenance area: 1) THENCE South 00 degrees 12 minutes 50 seconds East, 103.81 feet to a point for comer; 2) THECNE South 89 degrees 38 minutes 28 seconds West, 260.12 feet to a point for comer; 3) THENCE North 45 degrees 55 minutes 40 seconds West, 72.71 feet to a point for comer; , 4) THENCE North 00 degrees 25 minutes 51 seconds West, 52.52 feet to a point for comer, and being on the south right-of-way line of said Lowery Road; 5) THENCE North 89 degrees 34 minutes 09 seconds East, along said south right-of-way line 312.37 feet to the POINT OF BEGINNING AND CONTAINING 31,027 square feet of 0.7123 acres of land, more or less. Bearings are based on the Texas Coordinate System, NAD 83 (2011 EPOCH), North Central Zone 4202. Page 1 r EXHIBIT "A-2" STORM WATER FACILITY Detention Pond Maintenance Area I, Colin J. Henry, a Registered Professional Land Surveyor, hereby certify that the legal description hereon and the accompanying plat of even date represent an actual survey made on the ground under my supervision. 'Q•� �l_�'9 o9is OLIN ­—�HENRY.. Colin J. Henry, R.P.L Date VP 523p" �•�- Texas Registration No. 5230 CRIADO & ASSOCIATES, INC. Civil Engineering & Land Surveying Consultants 4141 Blue Lake Circle, Suite 1331 Dallas, TX 75244 PH 972.392.90921 FAX 972.392.9192 TBPLS Firm No. 101633-00 Page 2 EXHIBIT "A-1" POINT of JOSEPH C.DAVIS SURVEY WILLIAM LINN SURVEY LOWERY ROAD i POINT of C K�c BEGINNING 5//88''FIR 'BROOKES ABSTRACT N0.412 ABSTRACT NO.924 (VARLABLE WIDTH RIGHT-OF-WAY) BAKER'CAP (C.M.) 6 j-APPROXMIATE r 1 LOT s7 31,027 Sq.Ft. I S8W34'O9W f , \ -- 1 —- I /4J 07123 ACres --- �sslso 1 LOT 56 , `®_- 2 LOT 5 . LOT 54 Fl 3 50'PIPEVNE EASEMENT R. 50W 3 (L T) 1 -- �i,t- VOL.3838.PC.223 tf \ LOT 53 � LIRT.C.T. T-20.46' Ncn �I gig LOT 52 CB-- N N 68W36'W N = CL- 37.90' � w LOT 51 �& ! �1 Q Off. LOT 50 E� THE FOR7 WORTH INDEPENDENT SCHOOL DISTRICT t 1 LOT �� 4� c VOLUME 5064. PAGE 615 i r D.R.T.C.T. I W (� LOT 48 r p LOT I LOT 47 LOWERY ROAD SCHOOL n N CABINET A, SLIDE 5.394 v=i co 3 o Z LOT 46,�E& PR.T.C.T. ac i W Q m LINE TABLE = zQ I 3 LOT 45 I S00'12 507E 103.8r w C-> J z LOT 44 2 S89'38 28'W 260JZ i N rx � c Ln 3 N45'55'49W 727r va Y= 3e 4 N00'25'5rW 52.52' i a � LOT 43 5 N89'34'04'E 312.37' ° Q$ OW aRaNacE EASEMENT 1 ro cONraN ioo-YEAR FL000 �`\ CABINET A SUDS 5394 PR.rc.r. �jo�r;q� LEGEND �c � ° EXISTING RIGHT OF war LINE --- ..*P ....N.J.HLENRY..) PROPOSED TRACT -------- tgo�523p P PROPERTY LINE sugve`+ SURVEY �� - --- EASEMENTS T --- FOUND IRON ROD O FIR 0' 100' 200' 400' (UNLESS NOTED OTHERWISE) PONT FOR CORNER • CONTROLLING MONUMENT (C.M.) GRAPHIC SCALE DEED RECORDS TARRANT COMITY TEXAS D.R.T.C.T. STORM WATER FACILITY PLAT RECORDS TARRANT COUNTY TEXAS P.R.T.C.T. DETENTION POND MAINTENANCE AREA O.T123 ACRE TRACT OF LAND IN THE (HEREBY CERTIFY THAT THIS PLAT JOHN THRESHER SURVEY, ABSTRACT NO. 1870, IS BASED ON AN ON THE GROUND SURVEY CITY OF FORT WORTH MADE UNDER MY SUPERVISION AND, TARRANT COUNTY TEXAS TO THE BEST OF MY KNOWLEDGE, IS TRUE N RRECT. BEARINGS ARE BASED ON THE TEXAS COORDINATE SYSTEM, NAD 83 (2011)EPOCH 2010.00.NORTH CENTRAL ZONE 4202. Z - X:zz COLIN J.HENRY, R.P.L.S. 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ACRES ACRES C ACRES C COEFFICIENT A 1.662 0.529 0.90 1.133 0.30 0.491 B 0.673 0.673 0.90 0.000 0.30 0.900 C 1.839 1.238 0.90 0.601 0.30 0.704 D 0.615 0.000 0.90 0.615 0.30 0.300 E 0.567 0.079 0.90 0.488 0.30 0.384 F 0.532 0.380 0.90 0.152 0.30 0.729 G 0.926 0.370 0.90 0.556 0.30 0.540 H 1 5.265 1 2.991 1 0.90 1 2.274 1 0.30 1 0.641 AREA A,B,C,D, E,F,AND G PROPOSED COMPOSITE RUNOFF COEFFICIENT= 0.588 EXISTING POND STORAGE = 14,991 CF REQUIRED POND STORAGE FOR LOWERY SCHOOL ADDITION= 13,084 CF TOTAL REQUIRED POND CAPACITY= 14,991 CF+13,084 CF=28,075 CF THE PROPOSED POND CAPACITY= 36,422 CF TO DETERMINE THE ALLOWABLE DISCHARGE FOR THE POND,THE VALUE OF"Ca"WAS ADJUSTED SO THAT THE RESULTING DISCHARGE RATE FROM THE POND FOR THE 100 YEAR STORM,WOULD DETAIN THE ACTUAL DESIGN CAPACITY OF 36,422 CF.THE VALUE OF"Ca"WAS ALSO USED TO DETERMINE THE STORAGE REQUIRED FOR THE 1 YEAR AND 10 YEAR STORMS. THE EXISTING AND PROPOSED RUNOFF COEFFICENTS FOR THE SCHOOL SITE WERE UTILIZED TO DETERMINE THE AMOUNT OF ADDITIONAL STORAGE REQUIRED FOR THE SITE IMPROVEMENTS. jE OF .w fP........,,F 1 O 6 *�S 0 i N LD FEW 1*I AftNISE 1R�i •.1,P 6661• o��� i IS, S.✓✓ 31a C1.1O.2 LOWERY ELEMENTARY STORM WATER DETENTION CALCULATIONS 1 YR ALLOWABLE DISCHARGE FROM SCHOOL SITE&OFFSITE AREAS Qa =Ca*i*A Ca value determined from the total detention pond volume provided. Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.413 3.32 6.814 9.34 (Time of Concentration = 15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 9.34 0.588 6.814 95.835 13.425 20 REQUIRED STORAGE VOLUME-CF Vprelim=60[(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)] 4,816 CF Developed time of concentration(min) tc 12 3 hour 1 year storm intensity(in/hr) i 0.59 1 yr Critical duration storm intensity(in/hr) i 2.82 3-hour storm depth 1 year storm P180 1.77 Critical duration storm depth 1 year storm Ptd 1.03 Vmax=Vprelim*(Pl80/Ptd) 8,244 CF .: OF� /i Y. DON LA F WARNKE�1R�: ,..«_.....«...... v � s C1.10.3 LOWERY ELEMENTARY STORM WATER DETENTION CALCULATIONS 10 YR ALLOWABLE DISCHARGE FROM SCHOOL SITE&OFFSITE AREAS Qa=Ca*i*A Ca value determined from the total detention pond volume provided. Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.413 5.53 6.814 15.56 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td= ((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 15.56 0.588 1 6.814 203.93 1 21.09 1 26 REQUIRED STORAGE VOLUME-CF Vprelim=60((CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)) 9,327 CF Developed time of concentration (min) tc 12 3 hour 10 year storm intensity(in/hr) i 1.15 10 yr Critical duration storm intensity(in/hr) i 4.21 3-hour storm depth 30 year storm P180 3.45 Critical duration storm depth 10 year storm Ptd 1.54 Vmax=Vprelim*(P180/Ptd) 20,845 CF .007E�o�vOr \\ o OF T,: ,t1 i DONALD F WARhKE:JR.� p«.............. . 666710 ��� \ NA ti SN DL 2✓�tS C1.10.4 LOWERY ELEMENTARY STORM WATER DETENTION CALCULATIONS 100 YR ALLOWABLE DISCHARGE FROM SCHOOL SITE&OFFSITE AREAS Qa =Ca*i*A Ca value determined from the total detention pond volume provided. Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.413 7.98 6.814 22.46 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 22.46 0.588 6.814 322.07 24.388 29 REQUIRED STORAGE VOLUME-CF Vprelim=60[(CA*a)-(2CabAQa)"0.5 +(Qa/2)(b-tc)j 14,437 CF Developed time of concentration(min) tc 12 3 hour 100 year storm intensity(in/hr) i 1.81 100 yr Critical duration storm intensity(in/hr) i 5.87 3-hour storm depth 100 year storm P180 5.43 Critical duration storm depth 100 year storm Ptd 2.15 Vmax=Vprelim*(P180/Ptd) 36,422 CF F AV C r DONALD 'wgRNKE, Jtt o h•.............................. 'p, C) 4: -/5 T r r 12 910 S,/✓, 3 C1.10.5 PROPOSED CONDITIONS RUNOFF COEFFICIENT CALCULATIONS FOR SCHOOL SITE AREA DRAINAGE TOTAL IMPERVIOUS RUNOFF PERVIOUS RUNOFF PROPOSED AREA AREA AREA COEFFICIENT AREA COEFFICIENT RUNOFF NO, ACRES ACRES C ACRES C COEFFICIENT A 1.662 0.485 0.90 1.177 0.30 0.475 B 0.673 0.673 0.90 0.000 0.30 0.900 C 1.839 1.238 0.90 0.601 0.30 0.704 D 0.615 0.000 0.90 0.615 0.30 0.300 E 0.567 0.079 0.90 0.488 0.30 0.384 F 0.532 0.380 0.90 0.152 0.30 0.729 G 0.926 0.370 0.90 0.556 0.30 0.540 H 5.265 2.991 0.90 2.274 0.30 0.641 I 1 9.570 1 0 1 0.90 1 9.570 1 0.30 1 0.300 AREA A, B,C, D,and E PROPOSED COMPOSITE RUNOFF COEFFICIENT= 0.577 AREA H and I PROPOSED COMPOSITE RUNOFF COEFFICIENT= 0.421 EXISTING CONDITIONS RUNOFF COEFFICIENT CALCULATIONS FOR SCHOOL SITE AREA DRAINAGE TOTAL IMPERVIOUS RUNOFF PERVIOUS RUNOFF EXISTING AREA AREA AREA COEFFICIENT AREA COEFFICIENT RUNOFF NO, ACRES ACRES C ACRES C COEFFICIENT A 1.662 0.017 0.90 1.645 0.30 0.306 B 0.673 0.673 0.90 0.000 0.30 0.900 C 1.839 1.238 0.90 0.601 0.30 0.704 D 1.182 0.0000 0.90 1.182 0.30 0.300 F 0.532 0.380 0.90 0.152 0.30 0.729 G 0.926 0.370 0.90 0.556 0.30 0.540 H 5.265 2.708 0.90 2.557 0.30 0.609 1 9.570 1 0 1 0.90 1 9.570 1 0.30 1 0.300 AREA A, B,C,AND D EXISTING COMPOSITE RUNOFF COEFFICIENT= 0.516 AREA H and I EXISTING COMPOSITE RUNOFF COEFFICIENT= 0.410 �fjtiOF MFyy� lw i DONALD F. WARNKE, 1R 4P Q C1.10.6 LOWERY ELEMENTARY STORM WATER DETENTION CALCULATIONS 1 YR ALLOWABLE DISCHARGE FROM SCHOOL SITE AREA Qa=Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.516 3.32 5.356 9.18 (Time of Concentration =15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 9.18 0.577 5.356 95.835 13.425 16 REQUIRED STORAGE VOLUME-CF Vprelim= 60[(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)] 1,955 CF Developed time of concentration(min) tc 12 3 hour 1 year storm intensity(in/hr) i 0.59 1 yr Critical duration storm intensity(in/hr) i 3.21 3-hour storm depth 1 year storm P180 1.77 Critical duration storm depth 1 year storm Ptd 1.18 Vmax=Vprelim*(P180/Ptd) 2,940 CF �E of C31. P i::......... «...«»�«� i DONALD F. WARNKE, JR. .................... i .� ',4-10X+P�66611 `; 1 F tiG�SiE G' N ro a gils S,A/ � C1.10.7 LOWERY ELEMENTARY STORM WATER DETENTION CALCULATIONS 10 YR ALLOWABLE DISCHARGE FROM SCHOOL SITE AREA Qa=Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.516 5.53 5.356 15.28 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 15.28 0.577 5.356 203.93 21.09 21 REQUIRED STORAGE VOLUME-CF Vprelim=60 [(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)] 3,738 CF Developed time of concentration (min) tc 12 3 hour 10 year storm intensity(in/hr) i 1.15 10 yr Critical duration storm intensity(in/hr) i 4.71 3-hour storm depth 10 year storm P180 3.45 Critical duration storm depth 10 year storm Ptd 1.73 Vmax=Vprelim*(Pl80/Ptd) 7,467 CF OF �Sf ....�..... It0! of DONALD F:WARNKE 1R e+ao P�66611 ;o '+GISTE- ` �•G� C1.1O.8 LOWERY ELEMENTARY STORM WATER DETENTION CALCULATIONS 100 YR ALLOWABLE DISCHARGE FROM SCHOOL SITE AREA Qa=Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.516 7.98 5.356 22.05 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 22.05 0.577 J 5.356 1 322.07 1 24.388 1 23 REQUIRED STORAGE VOLUME-CF Vprelim=60 [(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)) 5,831 CF Developed time of concentration(min) tc 12 3 hour 100 year storm intensity(in/hr) i 1.81 100 yr Critical duration storm intensity(in/hr) i 6.60 3-hour storm depth 100 year storm P180 5.43 Critical duration storm depth 100 year storm Ptd 2.42 Vmax=Vprelim*(P180/Ptd) 13,084 CF F N, ♦ DONALD F. WARNKE. IR. i .,� 66611.. �e NOTE: • ALL HARDWARE RUST RESISTANT • ALL HARDWARE TO BE SUBMITTED FOR APPROVAL • ALL METAL FENCE ELEMENTS SHALL BE PRIMED, FILLET WELDED, CLEANED ETC. • NO CAULK SHALL BE ALLOWED AT STEEL CONNECTIONS, 2" KING POST CAP 4" KING POST CAP 45-460-4 45-460-2 4" SQ. POST VARIES L EQUAL CORNERS AND GATES 5'-6' 1' X 18" CONC. FOOTING FOR FENCE POST 6" EQUAL STEPS A=NEEDED COMPACTED SUBGRADE POSTS ONLY WHER TO 95% STANDARD NOTE: BOTTOM OF FENCE TO FOLLOW GRADE PROCTOR DENSITY _P���•OF•••TF B ,. Q Aw d*: :*v® DONALD F. WARNKE. JR. •®••••• •••••• 66671 •••• �0••;CC (�F ••®�c QO r�.s/•STE�NG11O® Q S ONA ®� �t�6Yt,dkC��fi�o%Vn1�t2 02-04-15 RlADO PROJECT: FWISD BP003 SCALE AS PER SHEET U.N.O. CIVIL ENGINEERING LOWERY ROAD ELEMENTARY SCHOOL &LAND SURVEYING SKETCH NO. 4141 BLUE LAKE CIRCLE,SUITE 133 JOB NO.: 13058 DALLAS,TX 75244 DECORATIVE FENCE DETAIL 1 . Tel 972.392.9092 ci Firm No.F4373 DATE: 02 FEB 2015 STANDARD INLET FRAME & COVER 4'-0" OR 5'-0* 6" 1'-6" or 2'-0",1'-6" or 2'-0" c%------------ L #4 BARS 7 12- O.C.E.W Ln cr < C% CONC. > z BUILD UP-"� T C�' \,#4 BARS BENT BARS/ \STRAIGHT BARS 12" O.0.E.W. SECTION E-E PLAN VIEW N.T.S. N.T.S. STANDARD DROP INLET 18-INCH DEPTH ROCK RIPRAP 18" 9" SUBGRADE COMPACTED 9-INCH BEDDING GRAVEL To MIN. 95% STD. PROCTOR DENSITY. 0 F ..........*.. R I P R A P DETAIL 0 DONALD F. WARNKE. JR. N.T.S. ..................V.. '% 66671 j, iv '0 6 'p, Q,-AV AV AV lN*A*I 02-04-15 PROJECT: FWISD BP003 SCALE AS PER SHEET ck. CRIADO U.N.O. CIVIL ENGINEERING LOWERY ROAD ELEMENTARY SCHOOL I &LAND SURVEYING JOB NO.: 13058 SKETCH NO. 4141 BLUE LAKE CIRCLE,SUITE 133 DALLAS,TI 11111 DRAINAGE DETAILS Tel 972.392.9092 C1 .12 Firm No.F4373 DATE: 02 FEB 2015 Exhibit "C" CITY OF FORT WORTH STORM WATER FACILITY OPERATION AND MAINTENANCE PLAN The only responsibility the City of Fort Worth has in the operation and maintenance of this Facility is inspection. General Maintenance Procedures The structural and functional integrity of the Facility shall be maintained at all times by removing and preventing drainage interference, obstructions, blockages, or other adverse effects into, through, or out of the system. Periodic silt removal shall occur when standing water conditions occur or the pond's storage volume is reduced by more than 10%. Silt shall be removed and the pond/basin returned to original lines and grades shown on the approved engineering plans. In addition, corrective measures are required any time a basin does not drain completely within 72 hours of cessation of inflow. NO STANDING WATER IS ALLOWED in basins designed for dry detention purposes. Accumulated litter, sediment, and debris shall be removed every 6 months or as necessary to maintain proper operation of the basin. Disposal shall be in accordance with federal, state and local regulations. Detention facilities shall be mowed monthly between the months of April and October or anytime vegetation exceeds 12-inches in height. To prevent debris from entering and clogging the downstream storm sewer system a wire mesh screen or similar screening device shall be installed over the outlet until final acceptance. 4. PREVENTIVE MAINTENANCE/INSPECTION • Visual inspections of all components will be conducted every 6 months. • A log shall be kept of maintenance actions, and inspections. The log should document the condition of the detention system's primary components, mowing, and silt, litter and debris removal dates. Document aeration of the basin bottoms and replanting to prevent the sealing of the basin bottom. • Written maintenance and repair records shall be maintained by the party or parties signing the attached Agreement and shall be provided to the City upon request. STORM WATER FACILITY MAINTENANCE AGREEMENT g Rev.09110/2012 Exhibit "D" STORM WATER FACILITY MAINTENANCE AGREEMENT 10 Rev.09/10/2012 I V E m � c c z a) y C a) N 0 CL U a) E SD N Q N �+ D cm 3 00 v to I w w w w w w w w w w w w w w LL c :c c c c c c c c c c c c c c C a) a) y a) a) w 0 0 0 0 a) y E E E E E E E E E E E E E E E > E E E E E E E E E E E E a) o o p o 0 0 0 0 0 0 0 0 U U U Eo U U U U U U U U U U U U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 p 0 z z z z z z z z z z z z z z z NI NI NI NI NI cn yl NI NI NI f/ll co NI .I yl Z — O - C LU C f C,' C C-. m a. a� m Q c O 0 C W m I y O E w p .m E o v '- c y m W a N o rn E N E rn L d m = y Cl. ° m c n v > m m N m m d U w o 3 3 m r• c c o m c 0 c U) z I w c N c 3 L m = @ O N m� y ° o 0 o E d m m m m C,o 3 3 3 `� m rn E cm c m L y 0 v c ,� n— m 0 'D y m y c a� c 2 m d 4) co 2 E U a °o c j c m m '� � N I z .0 O iri 3 o y n c E cm o m cn L) o m m v aNi �° m c E m 8 3 cLi >. m CL c 0 E v v a� >. m p v o ° — c m ea c C c "ai y 0 e > > m d>v w m z o o y w L¢y V A 0 ° w t w>c o Q N a N y o o W ti m m ,v O � �i cei v LO co ti co of ° vs �i c6 v u i a