FLOOD02442

• County: Rio Grande
• Community: South Fork
• Stream Name: South Fork Rio Grande River
• Basin: Rio Grande
• Title: Flood Hazard Study
• Date: 10/1/1980
• Prepared For: South Fork
• Prepared By: USDA Soil Conservation Service
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Over 90 percent of the total drainage area is ...itllin Nation8\ ~oreH
A ~ ,,~ ~A'_" '-,vice's mana,emcnt ,ractices ate effective
bounda<i.es an" t"" ~.~. ,~~ ~~

m." ter d[~inage plan tor the study "rea. Th is report p<,,,,ides the ""cline

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of flood h.llurd ..r..... on large scale maps specifically for this purpose.

in controlling runoff and in reducin~ erosion and sediment on public land.

Thee..i..", incorpor...tedto,,",s andcounti". ",itl"in the study..."......y

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Encroachment
Ofutm".. importal\ce 1S the possibility of encroachm"<I' ol\ the existing

provide zonin~ reguLations...

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cf flood ..."tet, ra15e

the f1oodelevations. and create hazsrdous velocities.

..."to "stablish, reguLllte, .."sedet, and limit ~\Jch ".es 01\ or
along any ato~ or floodwater runoff channel or ba.in, a. such
stOntlOr floodwater runoffohannel or baa in has been design"ted
and approved by thaColoradoWaterConserv..tionlloard, in order to
lessen or avoid the hazarda to persona and damage to property
resulting frOld the aocumulationof ato~or floodwaters"...

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flood plains. Developments within t'>.e flood plain could obstruot the flow

Enoroach_nti.afar

moresil;nificant factor than the additional runoff

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as stated inSeotion30-28-111 for county l;overnments and Section

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whiCh could be created by upatream developments.

31-23-201 for municipal l;overnments of the Colorado Reviaed Statutes 1973.

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Encroachment on flood plain., .uchas artificial fill, reduces the

Colorado Natural Hazard Area Regulations
In 1974, the Colorado Ceneral Assembly pas.ed Kou.e Bill 1041, a bill

flood-oarrying capacity, increaaes the flood heights of streams, and

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increases flood hazards in area. beyond the encroachment itself. Encroach-

"concerning 1and u.e, and providing for identification;designa tion,'IOd

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ment. can be controlled ~n zonin" rel;ulations.

administration of areas aod activities of State interest,

"(K.B.I041,

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Title 24, Mticle 65.1, CRS 1973, aa "mended). An>as of State interest

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.t.OODPLArNMANAGEMI>NT

include n.Hural hazard areas, or tho... areas that ate "so advers~ to past,

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current, or for~"eable c'mstruction or \and use as to constitute a ~illni.fi-

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Potential f1ooddarnagesto""i.tingdev"lopmentsandposaiblelo$3Of

cant ha"atd to public health and safety or to property." Flood plain. lIre

life Can b" alleviated or lessened throu~ aeveral nonstructural and

naturalhazardar"lls.

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.tructural methodS.

"'it~ reference to the administration of natural hazsrd areas, section

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!'l~,.,~t<""t,,<,,~ =t':"d: i,.,:1u<!~, f1~~<! ~hi,., '!:e::>;',l~ti",,!, l!,.,<! tr:H-

24-~5.l-202(2J(a) of the Act provides; Flood plain. sball be adminiUered

"'ent, flood warning and forecasting systems, flood insurance, flood proof-

so as to mini.mhc "i~nificant ba,,,"d,, to public health and safety or to

ing. and flood fighting and emergency evacuations.

property; open apace activities sball be encouraged; structures .hall b..

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Local Regulations
The oeed to minimize property da",age due to flooding hU been recog-

designed io te~s of use and ba.ard.; dispos"l sit"s and systems shatl be

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protect..d from inund.1tion by flood"ateu; ,,:><I /loth.itie. shaUl>e disc our-

nized by county planners. Subdividers and develo!>"" are requir..d to submit

.uerl wh;~h

in rim.. "f fl,,~,,;,,~, "",."1-1 :re"t~ .i~~ific:~t ,:""."",05

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.0 ~ti.., '"

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propos cd storOldrainageplan.. to the county cOlll",i"sionero forapp.oval. 10

henltb ""d ."f~ty 0< to prop~tty.

thepa.t, drainage plan. have been p.epared sinllularlyor ona plat -by-plat

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buis. lnfo.mation contained in this repo.t "ill be n.eful in developi~':I a

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