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co,,,,,,d ~. ~.ot ,~ '9"~"
I_ H. Lacy ~;ompany .
General Contractors'
214/357-0146 "Qualily Construction lot over 65 Years"
F."C I" r.lt.-~rJAt~ER
10888 Shady lrail
~.0. Box 154120'1'
Dallas, Texas 75354-1297
k. i-i. L 14Lii:"f
DATE
TO;
ATTN:
PROJECT:
G INN, i NC ·: CONSdL'i i ~[:~ EN~'J l NEE:I~5
!710~. PRESTON ROAL'
SUITE lC)Or L.B--.I~8
~DHN' KAR'LSRUHEF~:~ P.E. ~ RANDY FLEHINB
DENTCtN TAP RfJRi) IMP~CiVEMEN'I" F;~OM BEL.'f LINE "I'D 5AFIDY LAKE
CONTRACTOF~:
L. H. LACY COMPANY
RE:
SU6GESTED FIELD CHANGE, ITEM 582. ill}., IRRIGATION CONNECTIONS
THE SIXTEEN (16) IRRIGATION CONNECTS SHOWN ON ]"HE PLANS ARE
MORE THAN REQUIRE[) TO DO THE JOB. I BELIEVE A 2" DIRECT TAP
IS AS BIG AS YOU CAN GO ON AN 8" WATER LINE. THIS BEING THE
CASE, I SUGGEST THAT ONLY FOUR (4) EACH IRRIGATION CONNECTS
BE REQUIRED. THEY WOULD BE EVENLY SPACE[) AT APPROXIMA]'ELY
i4OO FT. INTERVALS 'tHE LENGTH OF THE .1OB (STARTING ;~
APPROXIMATELY A 700 FT. DIS'lANCE FROM THE SOUTH END OF THE
PROQECT). THIS ARRANGEMENT WOULD ALLOW TWO (2) OF THE
AND TI'IE OTHER TWO (2) IF:RIS~TION CONNECTS WOULD SUPPLY ANOTHER
SPRINKLER SYSTEM TIMER. THIS WOULD I<EEP THE MAXIMUM DISTANCE
TO T~E FARTHEST HEAD FF~OM A SUPPLY POINT Al' 700 FEET, WELL
t~ITHIN REASON FOR I'HE DESIGN OF' AN iRRIGAI"ION SYSTEM. 'THE
'TIMERS COULD BE PLACED AT AN APPRO~,IPiA'I"E DIS]'ANCE OF 210t~ FI'.
FROM EITHE~I END OF THE PF~OJEC]'~ THIS ~-JOULD KEEP THE M~XIMUM
IRRIGATION SYSTEM NIF~ING DISTANCE TO THE FAF~THEST SECTION
VALVE AT AN APPROXIMATE DISTANCE OF 1900FT~ THIS IS WELL
· WYTHIN ANY DESIGN CRITEF{IA.
'THE ADVANTAGES OF' GDIN~ 'ro THE AgOVE ARE AS F'OLLOWS:
BA[.I~F,_[I~'~ F'REVENTERS., AS REQUIRE[)
TWELVE (12) EACH }:'EWEF{ ......
~Y LAVJ~ AS !NS'CALLED ~7ITH SPRINKLER SYSTEM
TWELVE (12) EACH F'EWEF( ~IAI'E~ METERS l'O BE INSI'ALLED WI'I'H
SP~]NIqL~F~' SYSTEm :g AF'PROK]MATEL. Y
T~JELVE (12) EACH FEWER PLACES FOR A POTENT IA~ LE~K UNDEF~.
Ill
',r'H]£~ PROPOSRL WgLJLP RE[!UIRE THE t.:'[ILi.[JH]'I',~ I,,,I~CI--! ]'~' P;, TI;~!')~O.C'F'
~I'I'H t, lt.ll~,l' 18£iULI) i.'{E FCEL.!U]REI.." DUF~lt,IG THE ~OI',I~'TRU~TION OF THE
iRRIGATION SYSTEH:
l)
TWO (2> EACH SLEEVES TD BRING EITHER POWER TO THE TIMERS
IF MLAC~D IN THE MLDIAN: Oft 'THE SLEEVES WOULD 'BE REQUIRED
PLACED BEHIND THE ~'URB ON THE DLJTS1DE LANES. THESE C~tN GO
ON EITHER SIDE OF THE ROAD. PER CURRENT PLANS AND SPECS
THESE WDULD HAVE l'g HRVE B~EN BORED UNDER I"H~ RO/-~D ~1'~
CDN~UN~TION WITH THE IRRIGATION SYSTEM CONTRACT.
2)
SIXTEEN (16) EACH SLEEVES F'F~OM MEDIAN ]'0 MEDIAN (APPROX.
1~00 LF'), TO GET POWEJ{., AN[.) PIPING TO SECTIONS. THESE
GO ON Ell'HER SIDE OF THE ROAD. PER CURRENT PLANS AND SPECS
THESE WOULD HAVE TO HAVE BEEN BORED UNDER .THE ROAD IN
CON~UNCTION WITH THE IRRIGATION SYSTEM CONTRACT.
ATTACHED:
THE MINIMUM COST SAVINGS BY USING THIS PROPOSAL IS AS FOLLOWS:
REDUCT1. ON OF' TWELVE (12~ EA CONNECTS :.'-~ ~b56.UO/EA $?652.00
..BORING: OF 17nOLF OF SLEEVES :~ $ 3.50/LF $5950.00
TOTAL ~ ~' "~'= ' '"
~U~,~I, IRRIGATOR 50~0 IN THE STATE
OF TEXAS.
RESPECTFULLY,
SCHEMAT I C
FACTORS
DAVID M., SNYDER, P.E.
PROJECT MANAGER
I IRF,.' .i ¢~A'F :11 ON F A[~
~ ~U~Ci:.: ~KE--OFF Y~E~D~ THE FOLLO~ING:
THERE IS ~F'PROXIM~TELY 11~.000 SDUAR~ FEET OF GRASS MEDiaN
THERE '"',~ AI",'RO,,IM,~,EL~' ',r.'. ~ ~'' ' 1L~O0 LI' "dF" T~'fAL D~B'iAI'ICE
USED THE FOLLOWING FACTORS TO SIZE SYSTEM: ,
A 2" PVC IRRIGATION SYSTEM MAINLINE WILL SUPPLY APPROXIMATELY 55 - 60 GPM
WITHOUT EXCEEDING A 5 TO 7 FOOT F'~R SECOND VELOCITY STANDARD:
USED 4 GPM/FULL CIRCLE 15~ RADIUS HEAD AS A DESiGI'4 S'IANDAF;D
USED 50% OF THE RADIUS AS THE OVERLAP CRITERIA
.,I ,..E
USED 50 GPM/CIRCUIT AS A MAXIMUM CIRCUIT
USING THE ABOVE THE FOLLOWING INITIAL DESIGN INFORMATION WAS DERIVED:
118,000 SF TO BE WATERED/555 SF/FULL CIRCLE HEAD = 554 FULL CIRCLE HEADS
554 FULL CIRCLE HEADS X ~1. GPM/HEAD
1,556 GPM/50 GPI~/CZRCUI'i'
.:.._,~ GPM/24 STATIONS
= 155b GPM TOTAL SYSTEM
= ~.,"~'~ C I l~Ct,' I
= 55 GPM/STATION
THE MOST ECONOMICAL IRF;IGATION SET-UP WOULD BE TWO SEPERATE SYS'rEPiS TO WATER
ALL OF "iHE MEDIAN AF<EA. MAXIMtJM PiPE SIZE iN SYSTEM WOULD BE "~:' USE TWO
(2) EACH 2" IRRIGATION CONNECTS PER SYSTEM TO MINIMIZE H~TAD LOSS. MINIMUM
OPERATING PRESSURE Al' FARTHEST HEAD 25 F.'SI.