ST8201-CS 881108 (2)ATTN:
PRUJ ECl:
[~ONTRAC ]" OR:
RE:
JOHN KARLSRUHER? P.E., RANDY FLEMING
DENTCiN T/-~F' ROAD }]MPRL)VEMEN't' FROM t-~EL.'t LINE '1'0 5ANDY LAKE
F'F(OF'OSAL ~,()L~i 2)
L. H. LACY COMPANY
SUGGESTED FIELD CHANGE: ITEM 582. 10, IRRIGATION CONNECTIONS
THE SIXTEEN (16) IRRIGATION CONNECTS SHOWN ON ]"HE PLANS ARE
I~ORE THAN REQUIRED TO DO THE ,]OB. 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. ]HEY WOULD BE EVENLY SPACED AT APPROXIMA]'ELY
1400 FT. INTERVALS THE LENGTH OF THE JOB (STARTING ~
AF'PROXIMA]"ELY A 700 F:'i-. DIS'TANCE FROM THE SOUTH END OF THE
PROJECT). THIS ARRANGEMENT WOULD ALLOW TWO ~2) OF THE
· ~'r;'~"~n~ ~"ONN~'C'rC:' '!'0 ~' ~' ~ r~' ~ ~ ~p-~'~,,., ~'~, c~,,c"~-C..'M TIMER~
,,,,, -..~.~ n~u~r', ,WD ) Z~F:~BAT[n~.i mm~,t..~m~ ~OULD SUPPLY ANDTH[R
SPR1NKLEiR SYSTEM T[~ER. THZS ~DULD KEEF' THE ~X[~U~ D~ST~NgE
TO 'THE FARTHEST HE~D FRO~ A SUPPLY POINT ~T 700 FEET~ ~ELL.
WI-FHIN REASON FOR THE DESIGN OF' AN iRRIBA]"ION SYS]'[M. THE
TiP1ERS ['.OULD BE PLA~ED AT AN mPPROAi~tm't"~ uiS'~ANCE OF ~lot} F~.
F'ROM EITHER END OF ]HE PROJECT, 1HIS WOULD KEEP THE MAXIMUM
I' -. , T .~ " k ~ t~ ~' ~ ~:' ~
~F~.~AT.O,~~,~,~,, ~R~N~ D~'F~NO~ TO THE FARTHEST ~EOT~QN
VALVE Al' AN APPROXIMATE DISTANCE OF 1900Fl', THIS iS WELL
WITHIN ~NY DESIGN CRITERIA.
'~t'll J · I "lxl'~ "r'.
'THE m,,',.P.N] ~,'~E:? OF:' GOING 't'0 THE ABOVE ARE AS FOLLOWS:
2 )
3)
'TWELVE (i~, EACH FEWER 13ACKFLOW F,REVENTERS~ AS REQUIRED
~Y LA~? AS '" N:, F~.~,.-,-,-B WITH SPRINKLER SYSTEM
TWELVE (i'::") EACH F'EWER WATER METERS ]0 BE INS]ALLED W1TH
S~'F!INI.::....E-~;' SY~TE~ ;g APF'ROX !MATEL'Y $2000.00/EA. ...-
4),
TWELVE (12) EACH FEWER PLACES FF.'R A PO'fENI'iAL LEAl(
pAU ! I~!G, "
QUICK ]AKE-OF:F Y]]E~i)S THE FOLLOWING:
THERE iS APPROXIMAI"E~Y 118.00Q SQUARE FEE] OF GRASS MEDIAN
THERE I~; AF'I'ROXI~'''" '
USED THE FOLLOWINI~ FACI'ORS TO SIZE SYSTEM:
A 2" F'VC IRRIGATION SYSTEM MAINLINE WILL SUPPLY APPROXIMATELY 55 - 60 GPM
WITHOLIT EXCEEDING A 5 Ti] 7 FOOT PER SECOND VE. LOC~,Y S'f'ANDARD:
USED 4. ~F'M/FULL. CIRCLE 15'~ RADIUS HEAD AS A DESIGN S1ANDARD
USED 50% OF THE RADIUS AS THE OVERLAP CRITERIA
USED 50 GPM/CIRCUIT AS A MAXIMUM CIRCUIT SIZE
USING THE ABOVE THE~FOLLOWING INITIAL DESIGN INFORMATION WAS DERIVED:
118,0()0 SF' TI] BE WA'[ERED/353 SF/FURL CIRCLE HEAD = 554 FULL CIRCLE HEADS
334 FUL. L CIRCLE HEADS X 4- GPM/HEAD
= i556 GPM TOTA~ SYSTEM
! .336 ['~F'M," 50 ...... ' ¥' / '" '~ -,.n, ":
""? CiRCUiTS
i.3.-:!.~ GF'?,/24 STATIONS = 55 BPM/ST'AT'ION
]"HE MOS'[ ECONOMICAL iRRiGATION SE]'-UP WOULD BE TWO SEPERATE SYSTEM6 TO WATER
(2) EACH 2" IRRIGATION CONNECTS PER SYSTEM TO MINIMIZE HEAD LOSS. MINIMUM
OPERATING PRESSUE{E AT FARTHEST HEAD 25 PSi.
W,.Ih lgHA"I WOULL) L~E RE~.!UiHED DURING 1HE CONBIRU~T1DN DF THE
TWO (2) EACH SLEEVES 'FO BRING EITHER POWER TO THE TIMERS
IF P°LACED iN THE M~D1AN. OR ]~HE SLEEVES WOULDBE
~r, GE]" SEC]'ION VALVE ~IF'{IN~ ']'0 THE MEDIAN IF THE IlMERS
PLACED BEHIND ]'HE CURB ON THE OUTSIDE LANES. THESE
ON Ell'HER SIDE OF THE ROAD. PER CU~EN~ PLAN~ AND
THESE WOULD HAVE ]0 HAVE BEEN BO~ED UNDE~ THE ROAD iN
CONJUNCTION WITH THE IRRIGATION SYSTEM CONTRACT.
SIXTEEN (16) EACH SLEEVES FHOM MEDIAN TO MEDIAN (APPROX.
i~O0 LF), TO GET POWErs, AND PIPIN~ TO SECTIONS. THESE CAN
GO ON Ell'HER SiDE OF THE ~OAD. PER OURRENT PLANS AND SPECSi~.
THESE WOULD HAVE TO HAVE BEEN BORED UNDER THE ROAD IN
CONJUNCTION WITH THE I~IGATION SYSTEM CONTRACT.
THE MiNIMOM COST SAVINGS BY USING THiS PROPOSAL IS AS FOLLOWS:
REDUCIlON OF' I'WELVE (12) ~A CONNECTS ~ S~5~.~O/EA
E:ORING OF' 17r)OL.F OF SLEEVES
~ $ ~.50/LF $5950.00 -~
TOTAL $ I :Z~582 · O0
.... · '.~-,--~ ,,'¢, ~'.r.,,,".~,e,, AS LICENSED IRRIBATOR 50~0 -,~
~:,~,b~',,. T~,.~,-' ,,~- ~,~ ~:' THE STATE
TEXAS.
RESPECTFULLY~
ATTACHED:
SCHEMATIC
FACTORS
DAVID M. SNYDE~ P.E.
PROJECT MANAGER