FLOOD09884

• County: Crowley
• Community: Ordway
• Stream Name: Arkansas River
• Basin: Arkansas
• Title: Drainage and Street Design Manual for the Town of Ordway
• Date: 1/1/1987
• Prepared For: Ordway
• Prepared By: Simons Li & Associates Inc.
• Floodplain - Doc Type: Project

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d. Flows aM velocities W:i.ch DBY = at a design paint liIen the ~ucau area :Is
fully devel.0ISl shall be cmsidered. Drainage fac:l.lit1.es shall be so desigrBI soch
that :increased flows aM velocities will oot cause erosim dmBge.

e. 'lbe use of <J1-Bi.te detentim and natural dmInageways :Is I'A. ...,~ded mil E!ICOIIl'Ilged
whenever possible. 'lbe changing of mbJral. drainageway lacati.aIs will oot be
approved unless soch change :Is sOOwn to be without UIlI'e8P"""'h' p Imard and
liRhility, substant:lated by through analysis, and i.nvest:igatim.

f. 'lbe planning and design of drainage systaIB shall be such that prob1.eJB are oot
transferred iran (lie 10catim to another. QItfa11 points shall be desigrBI in such
a ommer that will rot create flooding ha2ards downstrean. Irrl gl'Hnn ditcb!S
shall not be used as outfall paints unless such is sOOwn to be witlDut Imard
substantiated by t:Imough hydrau1:l.c engineering analysis. Approval. of the ditch
canpany is required prior to ,.,..,<rinE""8t:ion of any proposal to the Town.

g. To evaluate the interacti.m of :irr:igatia1 ditcb!S with a DBjar dra:lnaga.ay for the
jIll1XlBE! of basin delineati.cn, the irrigatim ditch shall rot be lJt'ili7P<l as a basin
bouOOary. 'lbe ditcb!S are expe::ted to be flowing full ar near full during stornB,
therefore, the tributary basin nmff is 8SS1.".,n to f1o\f across the ditch.

h. Flood plain infarnet:im will be required m all preliminary and final drainage
~, am shall inc1ule the area :i.mJlated by the DBjar (lOO--year) storm nmff.
'JhiB infornatim shall RN'1'W1'ip"1\Y the final platting su!Jnl.tted for approval. by the
Town.

i. A DBSter drainage plan far the Town is available, the flow routing far lxlth the
initial storm and IIBjor storm nmoff shall conform to said plan. Drainage
mseJII!11ts confarmillg to the IIBSter plan will be required and shall be designated m
all drainage drawings aM subdivision plats. Annexatials to the Town shall develop
their DBSter drainage plan to conform with the existing stuly.

j. Approval will not be oade far any Jlluposed b.Ji1.d:ing or c.onstru:tim of any type of
structure :iJ:d.u1:ing retaining waIls, fences, etc., or the P'Rr.....,.,t of any type of
fill IIBterial, which will encroach m any utility ar drainage eBSeIIBlt or W:i.ch
will inprlr surface ar subsurface drainage iran SU1TI'llIIrling areas.

k. Streets are an integral pnt of the urban drainage systan and can be used for
transporting storm rwx>ff up to reasooab1e limits. Jb,1ever, the engineer sOOuld
recognize that the prinRry purpose of street is for traffic, and therefore,
reasooable limits far the use of streets for storm nmff IIlISt be followed.

1. All lots shall be graded so that water shall f1o\f to the lot boundaries aM t:ieJC.e
to the street or other drainage rights-of-wy.

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