HomeMy WebLinkAboutContract 45943 CITY SECRETI
CONTRACT N0.
STORM WATER FACILITY
MAINTENANCE AGREEMENT
THIS AGREEMENT, made and entered into this day of August Jam, 2014 by and
between PP Real Estate, Ltd., a Texas limited partnership, acting by and through its
general partner, 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
Lot 9R, Block CR, RIVER HILLS ADDITION, an Addition to the City of Fort Worth,
Tarrant County, Texas according to the plat recorded in Cabinet A, Slide 10216, Deed
Records of 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 Park Place Maserati 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
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
ril
f" more particularly described by metes and bounds in the attached Exhibit "A" ("Facility
f�
Property"); and
r
OFFICIAL RECORD
STORM WATER FACILITY MAINTENANCE AGREEMENT CITY SECRETARY
Rev.09/10/2012
F11nWORMTX
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.
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.
STORM WATER FACILITY MAINTENANCE AGREEMENT 2
Rev.09/10/2012
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 malting 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
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
STORM WATER FACILITY MAINTENANCE AGREEMENT 3
Rev.09/10/2012
FAILURE OF LANDOWNER OR ANY FUTURE OWNERS OF THE
ABOVE FACILITITY PROPERTY TO MAINTAIN THE FACILITY,;
ANY DAMAGES CAUSED TO PERSON OR PROPERTY DUE TO (1)
FLOODING OF THE FACILITYOR (2) FAILURE OF THE FACILITY
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 facility 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. Landowner
and each successor in title to the Property shall be responsible for the
performance of the obligations and payment of the liabilities of the Landowner
under this Agreement that arise or accrue during the period of such person or
entity's period of ownership of the Property.
[SIGNATURE PAGE FOLLOWS]
STORM WATER FACILITY MAINTENANCE AGREEMENT 4
Rev.09/10/2012
Executed this day of 201�
Landowner City of Fort Worth
PP Real Estate, Ltd.
By: PP Land GP, LLC its sole general partner
Name: Rick Stone Fernando Costa
Assistant City Manager
Title: Vice President
Approved as to Form and Legality
Assis ant ' Attorney-(DrCr,4 So c a
ATTEST
ity Secret ®R T
o°°oo°coa°
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°°0010°"00°j�
OFFICIAL RECORD
CITY SECRETARY
FT. NORTH,TX
STORM WATER FACILITY MAINTENANCE AGREEMENT 5
Rev.09/10/2012
STATE OF TEXAS §
COUNTY OF TARRANT §
This instrument was acknowledged before me on 20/ by
Fernando Costa, Assistant City Manager of the City of Fort Worth, on behalf of the City
of Fort Worth.
EVONIA DANIELS _
=< Notary Public,State of Texas
My Commission Expires
July 10, 2017
otary Public, State of Texas
STATE OF TEXAS §
COUNTY OF TARRANT §
�Before me, the undeFe'd ed authority on this day of
(�s/ , 2personally appeared, Rick Stone, known to me to
be the person whose name is subsc to the foregoing instrument and acknowledged to
me that the same is the act of PP Real Estate, Ltd., and that he executed the same as the
vice president of its general partner and as the act of such PP Real Estate, Ltd. and for the
purposes and considerati ore g instrument.
�VP(y_ TERESA Y RODDEN
Notary Public
State of Texas
Comm,Expires 04 0 =1
otar Public, State/Texas
i
STORM WATER FACILITY MAINTENANCE AGREEMENT 6
Rev.09/10/2012
I
EXHIBIT "A" - FACILITY AREA
CITY OF FORT WORTH, TARRANT COUNTY, TEXAS
Being a 0.351 acre tract of land situated in the John F. Heath Survey, Abstract No. 641, City of Fort
Worth, Tarrant County, Texas and being a part of of Lot 9R, Block CR, River Hills, an addition to the
City of Fort Worth, Tarrant County, Texas as recorded in Cabinet A, Slides 8264 & 8265, Plat Records,
Tarrant County, Texas, and also being more particularly described as follows;
BEGINNING at a point that bears South 68'59'30" East, 11.50 from a 5/8" iron rod found
for corner of said Lot 9R and the most southwesterly corner of Lot 4R of said River Hills
addition and also being in the east line of Lot 1, Block C, River Hills, an addition to the
City of Fort Worth, Tarrant County, Texas as recorded in Volume 388-195, Pages 19 & 20,
Plat Records, Tarrant County, Texas;
THENCE South 68'59'30 East along the common line of said Lots 4R & 9R, for a distance
of 10.84 feet, from which a 1/2 inch iron rod found at a common corner of said Lot 9R
and the southwest corner of Lot 7R, Block CR, River Hills, an addition to the City of Fort
Worth, Tarrant County, Texas as recorded in Cabinet B, Slide 2635, Plat Records, Tarrant
County, Texas, bears S 53'20'31" E, a distance of 480.51 feet;
THENCE departing said common line and through said Lot 9R, the following courses and
distances:
South 01'40'49" East, 42.24 feet;
South 61'40'49" East, 11.74 feet;
North 71'26'59" East, 28.08 feet;
North 21'00'30" East, 5.08 feet;
South 68'59'30" East, 240.00 feet;
South 21'00'30" West, 20.00 feet;
North 68'59'30" West, 240.00 feet;
South 42'30'53" West, 28.40 feet;
South 01'03'30" East, 457.50 feet;
South 88'56'30" West, 20.00 feet;
North 01'03'30" West, 466.00 feet;
North 88'56'30" East, 7.50 feet;
North 01'03'03" West, 12.13 feet;
North 61'40'49" West, 10.65 feet;
North 01'40'49" West, 52.19 feet to the POINT OF BEGINNING and
containing 15,305 square feet or 0.351 acres of land, more or OF
less. T
un
SHEET 1 OF 2 DARREN K. BROWN
A 5252
% P i a r s EXHIBIT "A" - FACILITY AREA 'Css\o�
EE N G 1 N E E R I N G JOHN F. HEATH SURVEY, A-641 s U
765 Custer Racal,Suite 100-Plano,TX 75075•(972)422-0077•TB PE No.F-2121 CITY OF FORT WORTH
Drawn By. Checked By Scale Date Job No.
BLM DKB 7/30/14 1 12-174 TARRANT COUNTY, TEXAS DARREN K. BROWN, R.P.L.S. 5252
Ding:G:\2012 J085\12-174 Park Puce Masereti\ADMIN—SURVEY\DWG\12-174 Drainage Ea..—H q Saved By:DB,,,. Save Time:7/30/2014 H1dUk06bFMD8rown Plot Date:7/30/2014 1:18 PIA
S 68'59'30" E POINT OF o R r
11.50' BEGINNING
5/8- IRF L 1 L5 Lot 4R, Block CR
CH RIVER HILLS ADDN.
1-4 Cab. A, Slides 8264 & 8265 PRTCT 4_5 N
L15 V
L 14—L 13 � 50 0 50 100 �-p v 5�
N�
1" = 100' a0' f Day
�a Q
V n .1d s 112" IRF o'
112 CIRS
vi
._j � Lot'SIR, Block CR ,Fti Ado SPIARSENG' 7l" Set
RIVER HILLS ADDITION S�
J Cab. A, Blades 8264& 8265 in conc.
PRTCT Lot 7R, Block CR
°L IVER HILLS ADEN.
112" IRF Cab. B, Slide 2635 PRTCT
° CM
L12 Easement Line Table Easement Line Table
Line J Bearing Distance Line Bearing Distance
L1 S 68'59'30°E 10.84' L9 S 42'30'53'W 28.40'
W L2 S 01'40'49'E 42.24' L10 S 01'03'30"E 457.50'
1
L3 S 61'40'49"E 11.74' L11 S 88'56'30'W 20.00'
= U L4 N 71.2659'E 28.08' L12 N 01'03'30'W 466.00'
L5 N 21'00'30°E 5.08' L13 N 88'56'30"E 7.50' /
L6 S 6859'30"E 240.00' L14 N 01'03'30"W 12.13' /
m �^ L7 S 21'00'30'W 20.00' L15 N 61'40'49'W 10.65'
N < L8 N 6859'30'W 240.00' L16 N 01'40'49'W 52.19'
18 J m SWM Facility 5/8" IRF
J = L11
U° Maintenance Area
AL 0.351 Ac. AY
(15,305 Sq. Ft.)
0z
VV-.\lBasis of bearing, horizontal and
0 h� vertical position derived from the
Texas WDS RTK Network—Texas
PG State Plane Coordinate System,
NAD83, North Central Zone (4202).
P
112" IRF 112" IRF \0 e
Lot 3, Block CR Al G
RIVER HILLS ADDN.
Cab. A, Slide 2758 PRTCT SHEET 2 OF 2 DARREN K. BROWN
o 5252
p i a r s EXHIBIT "A" - FACILITY AREA <'I"s uRV
E N G I N E E R I N G JOHN F. HEATH SURVEY, A-641
v
Drawn y.,ROod,Sced •Piano.TScale •(972)42Date •iBPE No-F-2121 CITY OF FORT WORTH
Drawn By: Checked W. Scale Date Job No.
BLM DKB 1 1° = 100' 1 7/30/14 1 12-174 TARRANT COUNTY, TEXAS DARREN K. BROWN, R.P.L.S. 5252
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Exhibit "A" - FINAL PLAT
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30 0 30 60
0+63.42 Line 'A'=
1" = 60' I I 0+00.00 Line 'B'
0+81.89 Line 'A' I Const. Type A MH
End 36" RCP ( w/Orifce Plate 'A' /
Begin 2-84" CMP T1 I Installed on Westerly
Face
I / Top=733.02
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2+67.82 Line 'A'
12" Wye
2+91.97 Line 'A' I \ \
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12" Wye
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3+92.62 Line 'A' I I / \ F.F.=751.0
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End 2-84" CMP C_
Begin 24" RCP
Access MH-
PAGE 1 OF 12 �
i
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R i N c LINE "A" - PLAN VIEW
765 Custer Road.Suite 100•Plano.TX 75075•(972)422-0077•TBPE No.E-2121 PARK PLACE MASERATI �
Drawn By. Checked By Scale Date Job No.
ED DKB 1° = 60' 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
Drawing:C:\Users\kRier\Desktop\12-174 SNFMA E.bil.drg Saved By Kwier Swz Time:7/30/2014 10:57:03 AU Plotted by.k.lu Not M,7/30/20141P.57 M
O R T
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MH 30 0 30 60
=719.97 x
=720.25
=na.1s 1" = 60'
- g 'A' 2-84' CMP
Fx 2+57.40 Line 'B'
Son Sw\ End 2-84" CMP
Begin 30" RCP
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I I / Top=733.02 \/
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PAGE 2OF12
p i a r s EXHIBIT 'B' - THE FACILITY
E N c t N E E R I N G LINE "B" - PLAN VIEW
765 Custer Road,Suite 100-Plano,TX 75075•(972 422-0077•TBPE No.F-2121
Drawn By. Checked By: Scale Date Job No. PARK PLACE MASERATI
ED DKB 1° = 60' 1 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
D,,W1y C:\u—\k.;er\Be=_ktop\12-174 S)Mua E.nait.d.9 S—d By.Kwier Sow T,—2/30/2014 10:57:03 Au HOW by kip R,t Date 2/30/201410.58 av
\PROP GRADE
77, SAND FILL TO
z
0
12' ABOVE PIPE
NON—WOVEN GEOTEXTILE
84" DIA. CMP 3.0, 84""DIA. CMP FABRIC
WELL GRADED CRUSHED
\ STONE TO 2/3RD9 PIPE
LINE "A" - CROSS SECTION
N.T.S.
\PROP GRADE
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0
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_ - SAND FILL TO
_ - 12'ABOVE PIPE
NON—WOVEN GEOTEXTILE
84""DIA. CMP \ FABRIC
\ WELL GRADED CRUSHED rr'\
STONE TO 2/3RDa PIPE x-12
IJNE "Im - CROSS SECTION
N.T.S.
1•(np) 3/8'STEEL PLATE
I (HOT DIP GALVANIZED
/ AFTER FABRICATION) ?
21'RCP(BEHIND)
\ /
3/8" DIA. x 3"BOLT WITH
EPDXY GROUTED EXPANSION
ANCHORS(TYP.) 12 1/2" DIA.
OUTEALL — ORIFICE PLATE DETAIL \
PAGE 3 OF 12 N.T.S. '
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R t N c LINES "A" & B" SECTION & OUTFALL DETAIL
765 Custer Road,Suite 100•Plano,TX 75075•(972)422-0077•TBPE No.F-2121 PARK PLACE MASERATI .,
Drawn By Checked By: Scale Date Job No.
ED DKB ######## 4/30/13 12-n4 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
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• i a r s EXHIBIT 'B - FACILITY
PROFILE
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AGE 5 OF 12
p i a r s EXHIBIT 'B' - THE FACILITY
EN (-- 1 N E E R l N c LINE "A" - PROFILE VIEW
765 Custer Road.Suite 100•Plano,TX 75075•(972)422-0077•TBPE No.F-2121 PARK PLACE MAS ERATI
Drawn By: Checked By: Scale I Date Job No
ED DKB 1" = 60' 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
Na4,9:C:\Users\krrier\Desktop\I2-174 WIVA Ea Tbit.d.g Saved By.K.w Save ii—7/30/2014 11:01:00 A11 Fbttcd by k—floc Dale 7/30/2014 11:01 AV
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PAGE 6 OF 12
J
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R I N G LINE IT"- PROFILE VIEW
765 Custer Road,Suite 100•Plano,TX 75075•[9721422-0077•TBPE No.F-2121 PARK PLACE MASERATI
Drawn By. Checked By: I Scale I Date I Job No.
ED DKB 1" = 60' 4�30�13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
D—,g:C:\Users\6i\De'itw\12-174 SM5 A bhbit.d" S—d By.Kxkr Sm Time:7/30/2014 11:01:00 AN NNd bF W,Nt Dote 7/30/201411:03 AU
1, ST,I)OYME THUI3?LUCY
A. S7ZtDi' C:()PC
The current 6.6-acre vacant lot at 5760 Bryant Irvin Road is the proposed location for a new
� 1m�hie.a 1""A W ` hp-Mirfinafnnnarnnt;t c3Tncv 1h,thia4 Lot'(River S
Addition,Lot 9-R,Block CR)drains to Ille west wrthwest.
'llis lot drainage pattern shows to he(at least partially)in brains area A-13 in the
..,y., -Y. .----'— �o-.
SeptctnberLfJt7l3 plans for Uai�s:seiausrail txtta�f5,s'r3eei Y}.snesepran�snmv a.�u4-re�
raucentraling at a 24•-inch stetrouL with a design I W-year flow of 29.2 rfs{A.ttachment2,
K1643,shcrxl).
The 2003 plans for development o€'the Home Depot Landscape Supply(W-1 586)store
shows that the 24-inch is extended to the northwest corner of lot 9-R as a 21 inch with a
capacity of 20_7 cfs(shis C-7,C-8)•These plans show 3.3 acres(sht")roncMrating at
this corner with a calculated flow of 32.7 cfs for the 100-year and 199 eft for the 5-year
storm event(Attachment 3).
5piars Engineering(skeet C4)pre-development drainage area map(Exhibit 3)shows all
drainage areas that are within ibe urge of inftuct=,or about fig acres.At this point in the
watershed there is a 6n RCP in Oakutont Blvd,(W-166)that is shown to have a capacity of
548 cfs(W-466 sht 8,,Attacbmtmt 4)_Thm computes 100-year discharge fa this point is 438.5 �
cfs usingn tc of 10 minutes for the entire 67 acres.(Q=Clk"M 67)With a flow C
length of 5700 fct,a titan;roalistic to would be closer to 18 mimutest an I of 7.4,mW a
composite C of0.71 fcr a 100-yearflaw of 353 cfs, �
Spiars Engineering(sheet(:5)propnsed project drainage area map(1:oAAbii 4)shows that
6{16 acres of t11e 6.60 acie lot 9�-R is planned to be graded such that the drainage will he s
collected in a detention suwttn with a discharge point at tlm northwest corner.A total of
0.44 aches will drain off the site as undetained f1mv.This cn&meiing report prescr its
C
7
2
t,
•Z
PAGE 7 OF 12
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R I N G DETENTION METHODOLOGY AND CALCULATIONS
765 Custer Road,Suite 100-Plano,TX 75075•(972)422-0077•TBPE No.F-2121 PARK PLACE MASERATI
Drawn By. Checked By: Scale Date Job No.
ED DKB NTS 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
Dra:.ng:C:\Users\kale,\Dosktop\12-174 S)sFMA Er bil.dq Saved By Kwier Save Time:7/30/2014 11:01:00 AU Plotted by Ue,Not Dale 7/30/201411:04 AU
proceed lost-project design calculations that will reduce the total peak flows from the 6.6
acre lot to be no greater than 19.6 cfs Mite 5-year flaw rmpaeaty of the 21-inch).These
calculations am to show a finding of 40no impaLT to mereased peak discharges for the i yr
1 u-yr,and 100-yr fuuy urbanized sturM events. .i ne stay users the ranonac inernau ro'p`mK
11ow calculation and the iS trJM modified rational for detention volume calculations_
. WATls MHE0 DES1G,rti'1�'t1&4W ENS
[ding the rational method to determinethe prrgect peak:flows for the different frequency
storm events the parameters in the following Table 1 were used.Spiaus Sheet C4 Shows the
project area currently is split into two areas;Area B,a 4.66 acre parcel that drains to the
northwest Cornor and Area A,a ZGg acre parcel shat drains as sheet flaw in u westerly
d'srection.
TABLE 1—Pm—ProiLa Ruwff Calculations(Area-R)
{ =CIA (equation 1.26)
-
Storm ice) (min) (trattlr) t2(cCs}
i6 -Yaar 4.66 12.34 10 924 12.92
'Tat-Year 4.66 0.34 10 6.51 U-10
i-Year 4.66 GM, 10 4.06 6M
Tim 21"outfall pipe at the northwest corner was designed for a peak Tease of 19.6 cfs.With �
an undetained flo-w of 3.7 efs(OA4 acres),the peak release for the detention system is being'
designed for 15.9`cfs. Using iSWM(t.5.2 Design£equations,pg Ha-39),the modified
rational method is used to deterraitile the storage required for the I alt?-year;I 0-year and the t-
year frequency storm event&
s
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PAGE 8 OF 12 Z
P i a r s EXHIBIT 'B Y
' - THE FACILITY
E N G I N E E R I N G DETENTION METHODOLOGY AND CALCULATIONS
765 Custer Road,Suite 100•Plano,TX 75075•)972)422-0077-TBPE No.F-2121 PARK PLACE MASERATI �\
Drawn W- Checked By: Scale Date Job No. \
ED DKB NTS 4/30/13 1 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
D—*,9:C:\users\k,1,,\oesktw\12-174 S4F4FF 1A E�bit.dwB Sacred B%K,ie, Sava Time:7/30/2014 11:01:00 AM Potty tr.are Not Date 7/30/2014 11:05 AV
TABLE 2-Critical Dumlion Storm Calculaticros
V- (47CAaWQ)—h,P~storm depth for critical duration(equation 1.27)
Area Q Facer Factor
storm (A} (cfs} [a) (b) (min) (in)
IWYear 6.06 0.90 i6.90 322.47 24.388 49.02 4.36
IWYear 625 a:90 -9.10 203,93 2i.096 6073 2,82
1-Yew 6.00 &90 YS_BS 95.835 ,13.425 36.28 1.94
Using the critical storm duration to soled thizstorm depth,the required storage votiune is
obtained with the following equation.
TABLE 3—Detention Volume Required
Vp=60(CAa-J2CahAQ t(Q/2)(bt)l(egwflon 7.28nj Vin=(VP)(PisdP)(equation I nb)
t--time of coneentration developed condition, Piao=34wur stotvi depth
Siam t(min)) P18'(ia) P{inl Volumes Volume-
VP(mil Vmm
100-Year 10 5.43 4.36 42,227 52 .—
10-year 10 3?t5 2.82 $0,558 37,385;
i-Year 14 1.77 1.94 15,005 13.554;
Spiars f ingineering titans shows that the detention is to be underground and is sized to
contain no fens than a total volunte of 52,590 tubic'feet. these plum,also allow the orifice �
i3YStgtl GA1LUiiftLUnS to urntrt3l the T:4LG!Ut uhG uutcECUt-a3vaTc1 1tciiiacii6m.
V
G. GDNGLUStt�l![3
Home Depot L ndscape(ttr-1586)plan sheet C-7 shows the plait view of the 2I"outmil
pipe that extends to the projW northwest corner.Plait sheet C-9 shows the profile of the 21"
t
as Storm Line 1.0.This profile shows that from station 0+00 to station 0+79.26 there is a 247'
with a slops of 2.86Blo,a Q of 34.12 c#:s,and a capacity of 3816 cfs;x(siutiiYti 0-x79.26 the
pipe size changesio a 21"with 3 slope nf5.060/, a Q of 119.6 efs,laid a capacity of 35.67 cfs; �
at station 3-1110 the 21"changes to have a slope of 1:70%,a Q of 19.6 cfs,and u capacity of
4
j
PAGE 9 OF 12
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R t N c DETENTION METHODOLOGY AND CALCULATIONS
765 Custer Road.Suite 100•Plano,TX 75075•(972)422-0077•TBPE No.P-2121 PARK PLACE MASERATI
Drawn By. Checked By: Scale Date Job No.
ED DKa NTS 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
Ora.ln¢C:\Users\knw\U,kt.p\12-174 SAFMA E)hbit-dxg So d By.K,I,, Save Time:7/30/2014 11:01:00 Ald P1dtN by kee Plat Ntl 7/30/201411:05 AU
20.66 cfs)This section of the 21"RCP is terminated at the project northwest comer at station
4+17-40.
At this termination paint the 21"RCP has a design flow of 19.6 efs with the hydraulic grade
showing partial flow conditions.The peak release from the project site into this storm sewer
is to be no greater than 15.9 cis,less than the design discharge_Therefore,there is no
negative impact to this reach of 21"storm sever system.
This analysis of the downstream impact of the proposed development of River Hills Addition
Lot 9-R shows that,with detention,the connecting storm sewer capacity within the 67 acre
zone of influence is not excEedcd for any of the I year,I 0-year,and I00-year storm events.
The post-project peak flows,at no point in the drainage system,are greater than the pre-
development peak flows. These calculations show a finding of"no impact"to the existing
storm drainage system for these fully urbanized storm events.
As supporting information,attachments showing the Oak Bend Trail drainage plans(K-
1643),Home Depot Landscape drainage plans(W-1586),Rives Hills Addition Drainage
plans(W-466),Spiars Engineering Sheet C4 pro-development drainage areas for zone of
influence,and Spiars Engineering Sheet C5 post-project drainage areas for zone of influence
are included in this report. o
\x°
a-
J
5 t.
J
PAGE 10 OF 12
%h1h, P i a r s EXHIBIT 'B' - THE FACILITY
E N G t N E E R t N G DETENTION METHODOLOGY AND CALCULATIONS
765 Custer Road,Suite 100•Plano,TX 75075•(972 422-0077•TBPE No.F-2121 PARK PLACE MASERATIz
Drown By. Checked Sy. Scole Date Job No.
ED DKB NTS 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
Drawing C:\Users\Wer\Des<too\12-174 SNFIAA E,hbit.dq S—d By.Kwler Sava Time:7/30/2014 11:01:00 AV Rolled by.Wd Rot Dote 7/30/211411:09 0.V
DETENTION at 100Yr Storm:
Proposed 1371 LF of 84"CMP=1371 LF'38.48 CF/LF=52,756 CF
Volume provided for 1yrStorm at WSEL=732.45
Station Distance Pipe Diameter Flowline Depthofwater(d) d/Dratio area/D2 multiplier ^eawithinpil Avg Area Inc Vol Tot.Vol
D(ft) at WSEL=732.45 (ft 2) (ft Z) (ft 3) (ft 3)
77.06 0 7 729.62 2.83 0.40 0.29 14.38
14.14 973 973
100 22.94 7 729.69 2.76 0.39 0.28 13.90
13.42 2013 2986
150 50 7 729.84 2.61 0.37 0.26 12.95
12.48 1871 4857
200 50 7 729.99 2.46 0.35 0.25 12.01
11.54 1731 6588
250 50 7 730.14 2.31 0.33 0.23 11.07
10.62 1593 8181
300 50 7 730.29 2.16 0.31 0.21 10.16
9.71 1457 9638
350 50 7 730.44 2.01 0.29 0.19 9.26
8.82 1323 10961
400 50 7 730.59 1.86 0.27 0.17 8.38
7.74 1161 12122
450 50 7 730.74 1.71 0.24 0.14 7.10
6.69 1003 13126
500 50 7 730.89 1.56 0.22 0.13 6.28
6.08 620 13745
534 34 7 730.99 1.46 0.21 0.12 5.88
Volume provided for 10yrStorm at WSEL=735.00
Station Distance Pipe Diameter Flowline Depth of water(d) d/D ratio area/D2 multiplier Area within pipe Avg Area Inc Vol Tot.Vol
D(ft) at WSEL=735.00 (ft 2) (ft 2) (ft') (ft 3)
77.06 0 7 729.62 5.38 0.77 0.65 31.80
31.59 2174 2174 w
100 22.94 7 729.69 5.31 0.76 0.64 31.38 j
30.96 4643 6817 `b
150 50 7 729.84 5.16 0.74 0.62 30.53
30.10 4515 11332 3
200 50 7 729.99 5.01 0.72 0.61 29.66
28.99 4349 15681
250 50 7 730.14 4.86 0.69 0.58 28.32
27.87 4180 19861
300 50 7 730.29 4.71 0.67 0.56 27.41
26.95 4042 23903
350 50 7 730.44 4.56 0.65 0.54 26.48
26.01 3901 27804
400 50 7 730.59 4.41 0.63 0.52 25.54
25.06 3760 31564 <
450 50 7 730.74 4.26 0.61 0.50 24.59 D
24.11 3616 35180
500 50 7 730.89 4.11 0.59 0.48 23.63 .
23.15 2361 37541
534 34 7 730.99 4.01 0.57 0.46 22.66
J
PAGE 11 OF 12
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R l N c DETENTION METHODOLOGY AND CALCULATIONS
765 Custer Road,Suite 100•Plano,TX 75075•(972)422-0077-TBPE No.F-2121 PARK PLACE MASERATI
Drawn By: Checked By Scale Date Job No.
ED DKB NTS 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS y
D,.We T a\U-\W,\0e�kto\12-174 SAFMA r,nan.d,g Saved By.K,.,r Sam Tors,7/30/2014 11:01:00 A!a ROW by W. pot oats,7/30/201411:10 M
Detention Outlet 100yr Structure Calculations
Flow through the 12.5'orifice opening in 100yr Storm Events
D(inches) 12.5
A(sq.ft.) 0.852
C 0.6
Flowline Elev. 729.62
g 32.2
Orifice Flow Equation =C*A*sgrt(2*g*H)
Design Storm WSEL Head(Feet) Q(design) Q(allowable) Remarks
100yr 737.99 7.85 11.50 15.9 releasing less than allowable at 100yr
Detention Outlet 10yr Structure Calculations
Flow through the 12.5'orifice opening in 10yr Storm Events
D(inches) 12.5
A(sq.ft.) 0.852
C 0.6
Flowline Elev. 729.62
g 32.2
Orifice Flow Equation =C*A*sgrt(2*g*H)
Design Storm WSEL Head(Feet) Q(design) Q(allowable) Remarks
100yr 735 4.86 9.05 9.1 w/in 10%of allowable
Detention Outlet 1yr Structure Calculations
Flow through the 12.5'orifice opening in 1yr Storm Events
D(inches) 12.5
A(sq.ft.) 0.852
C 0.6 s
Flowline Elev. 729.62
g 32.2
Orifice Flow Equation =C*A*sgrt(2*g*H)
5
Design Storm WSEL Head(Feet) Q(design) Q(allowable) Remarks
100yr 732.45 2.31 6.24 5.7 w/in 10%of allowable
PAGE 12 OF 12
p i a r s EXHIBIT 'B' - THE FACILITY
E N G I N E E R I N c DETENTION METHODOLOGY AND CALCULATIONS
765 Custer Road,Suite 100•Plano,TX 75075•(972)422-0077•TBPE No.F-2121 PARK PLACE MASERATI
Drawn By: Checked By: Scale Date Job No.
ED DKB NTs 4/30/13 12-174 CITY OF FORT WORTH,TARRANT COUNTY, TEXAS
D,aW,g:c:\U—\W,,\De�t�\12-174 SMA E.bit.dq saved By.K.*., So.T—7/30/2014 11:01:00 nu %RM Ey k,W wm 001E 7/30/2014 11:11 eu
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 vault 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.
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, and silt, litter and debris removal dates.
• 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 8
Rev.09/10/2012
Exhibit "D"
Storm Water Structural Maintenance CHECKLIST
FREQUENT REPAIRS REPAIRS
INSPECTION DATE REQUIRED MADE NOTES
Remove Trash and
debris
Inspect irrigation
system operation
Remove grass
clippings
Violations Noted
MINOR
INSPECTION
Condition of Pond
Amount of silt in
vault
Amount of ponded
water
Condition of trash
guard
MAJOR
INSPECTIONS
Condition of Storm
Water Quality
Structure
Type of Storm
Water Quality
Structure
Structure type and
Condition
Evidence of
Animals
Evidence of Aquatic
life
STORM WATER FACILITY MAINTENANCE AGREEMENT 9
Rev.09/10/2012