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PRCORAINAGE STATEMENT
I'n the interest of the public health, safety,and general welfare the
City Engineer may require of developments larger than one half (1/2) acre,
i ncl udi ng residential subdi visions, and/or proposal s to cover the.exist'i ng
site wi th40% or more impervious ma teria 15, Drainage/Gradi ngPlans pr:epared
by a registered professional engineer to be submitted to theCftyEngln<<~er
forreviewandapprova 1 prior to the issuance of any deve 1 opmentlbui lai I1g
permits. If Drainage Easements are required the width ther~~rs,~01l:not be
approved until a drainage study has been presented to the C~}~rE~,~i.~e,~r for
review and approval. Drainage Easements widths shall be ba0~.~tiO~!i.ti~e!iireqUired
.water flowage space plus maintenance space requirements. AlTljir~~tll~fJlTolf 20
feet outside the requi.redfl owage space shall be required fcu~:i1'l~II~~~n~nce
'. . .. . .. .(. "i:li! >Ji!l!ril:,i:: }' I, i
purposes. Thi sspace may be used for utility location if t~~:.'iii:r~m!i~r~!i nage
channel rema ins accessi b 1 e to maintenance equipment. Prote.T~~:jll:i!~~i~'i de slopes
and channel bottom sha 11 be provided as requi red by the Ci tYT~:~~I'n.02r!to prevent
erosion. The Developer shall make every reasonable attempt tu'jPj~~~nj any
increase in the rate of surface water runoff after constructi~n~~i:~ljS~all refrain
from concentrating the same in a manner which may cause dama~~.t~,~~jucent
properties. Drainage reports s~11 reference: thepreconstrup,ti.@I11:rate of
surface water inflow and outflow and shall show the locations Of the same; the
same information for each phase of the post construction surfa.:ce waten inflow
and outflow and design criteria applied to the calculation oft:hese. quantities
and the facilities used to prevent any increase in the volumeandvolocity of
post construction surface water runoff.. As a minfmum, storm sewers shal'l be
designed to carry a 5 year rainfall intensity. No construction shall impede,
constrict,or block the flow of water in any natural or improved watercourse.
For the purpose of cons i stenteva 1 ua ti:on, the method 0 fca lcula tion of surface
water quantities shall be as described in the latest edition of the uHYDRAULIC
MANUAL" prepared and compiled by the "Texas Highway Department-Bridge ~ivision
for Brazos County ."Proj ects thus designed and approved shall be constructed
to comply with the approved plans and specific~tions. All drainage facilities
which will become public property upon completion must have plans, specifications,
and estimates' prepared by and the engineering construction executed under the
direct supervision of a registered professional engineer. 4
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Fii. 21-.84.. Nomographsolves Hazen-Williams f(iU"ITIula for pipe flow.
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Ex;.ullple21..11, isputin the fornlhf=;; KQ'l,.then K =4.727LID4.81 Cl1.8Sand n = 1.8.5. The
expression InKQn-1equals I(nKQR/Q). In the HaZen-\Villiams f()rIllula n = l.8.5 for all pipes
and ,can therefore be taken outside the surnlnation sign. Iflence. the adjustIllt:l\t' equation
becomes
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It it,; inlpdrtant that a consistent set of signs be used:, The sign convention chosen for the follow-
"lIe nlakes clockwise flows _ and,the losses frolll these Haws positive, while counter-
ws and the'irlosses are negative.
-12. Analyze the pipe netw'ork in Fig.2l-85 by the HardyCros$ Inetho.d.'
the various sizes of pipes into equivalent pipes, all of the samediaoleter (in
l,e samehead-:-Ioss characteristics as the original pipe.
lOops and pipes'in the nehvork for identification.
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(21-144)
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City of College Station
posrr.OPFICE BOX 9960 110lTEXAS.AVENUE
COLLEGE STi\. TION, TEXAS 77840..2499
February 28, 1986
Mr. Bob Davis
E I DYLON CONSTRUCT ION CO., INC.
53464-.NorthFreeway
Houston, Texas 77022
RE: Approved .Slte/.Landscaplng Plans
P rop()secl DJscountTlr'e.Store, (86-900)
Texas Avenue, Coll ege Stat ion
Dear Mr. Dav i's:
Enclosed a nine' (9}approved copies of the revised site/landscaping plan
for the above referenced project.. Also enclosed lsallPlanRevlew and
Bulldlng PermltProc.ess'-1 instruction packet. Yourappl ication Is now
ready-for Step lias shown .f.>M page on'e of that packet.
If thePlamn fng Departm.ent can be of further assJ stance to you, pl ease~
do not hesItate to contact us.
Sincerely,
PROJECr.YLANREVIEW
i~... .... ~........l.~.. ..... J... ~~:t;!i ~1 J~{
~v. /\~~ '~ rI.t ~ . ..
.. .~. P~\f\ P~ ca!e No. f~_~_ft:!9
J/'/
CITY OF COLLEGE STATION
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Dt.. ..., .....,...... ..... ... .,
a e ___ '.i. ..._ _.,-___.,-___
Namejdescriptionof project/request
/i:ie ~TC~
Location~(}~tfl>k2r g4~Rm,q..JF.K1<eVG~ l?IIf~ ~~p_
Name or;Plicant ...... ))/.!SCt:)t)/tl-r77,t:.e t)r -rei-AS
Address ..~&..;/~...~....A!. . r;tJ.~...kJ45r4tJhone No.(&~1t3 -'9';-~
Landowner€.fE[J7ZU!~)~/l?B iI' ..eiJ~teG,Jr - . ~e(&1Ll> !=R,e,eRLI
Address . .. .~t?~eJ. ~P4S:c;,,~. ... . Phone No.
-
Sit eP lansiRequi re/d{2copi es)
,Staff Review with comments on site plan :
City Engineer
Fire Marshal
Electric.al Sup.erintendent
Dir. of Public Services
Water/Sewer Superintendent
Zoning-Official
Approved
date
Den i .ed date
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