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<br />.... <br /> <br />,,~to<, <br /> <br />...it'>.a.dditional desttuctive force. <br /> <br />Ob6t,uction. caused by debris <br /> <br />Rio Crande , 209.4 (64.8) 24Q,l 000.9) <br /> , 52.1 (21.1) 93.6 (37.9) <br /> 6 ~3.1 (21.5) 76.9 (J1.1l <br />Subtotal 314.6 (127.4) m (169.9) <br />Study Area .otal 377.1 ClS2.?> SOI.5 (203.1) <br /> <br />I <br />I <br /> <br />t <br />t <br />I <br />1 <br /> <br />i~~~ brid~~' and culvert!. <br /> <br />The.e obst'uctions .act .s dams, baCkinq the <br /> <br />'/]~ ~r <br /> <br />"pstt""", untit <br /> <br />,h"ybteak loose,Cllusingasudden surge Of..St1 of <br /> <br />I <br /> <br />Flood haurd exhibits fo, the study area are in the Ai>P"ndix fotlowinq <br /> <br />I <br />I <br /> <br />I <br /> <br />cloqqin~ culvett. and bridges are variable, resulting in a cultitude of flow <br />,,,ndition" .....iell lIreunpredicuble for anYl\;",en fl<>od,,"enL The pOtential <br />dIet! of debris dogging are n"t included in the flood profile detet..ina- <br /> <br />11 One aCre is equal to 0.405 hectares. <br /> <br />Flood Hazard Kshibit. <br /> <br />t;ons. <br /> <br />the teKt of thi. report. Included in the Appendix are: Flood hazard acea <br /> <br />I <br /> <br />g <br /> <br />I'loodwaterflowingathi'?hvelocitiescre.tesd.ngerou.<:ondition.. <br /> <br />map index, flO<>dh.zard ..e....p., flood profiles, typi<:d ".lleycrou- <br />.ections. .nd t.buhtions for the flood frequency-elevation .nd disch.rge <br />d.ta. Por uae in deten.ining the flood huard foc .ny particular location, <br /> <br />I <br /> <br />"eloclti... exceeding 3 feet pH aecond ..ith depths of 2 feet 0>: ",Ore aCe <br /> <br />1 <br /> <br />&ener.lly considered haz.rdous. Those condition. would exist at several <br />loc..tion~ in the study ..rea, especially in tile rivH clla<lnels and depressed <br /> <br />the flood profilea andtabutar....terial.re as.eOlbledbyr".chnu",bers in <br />sequential order, I throu~h 6. The follo..in'? are descriptions and suggested <br /> <br />I <br /> <br />11 <br /> <br />ar~"s within thl! ftoGd plain. <br /> <br />\l <br /> <br />Duration of floodin'? will vary, depending on the se.son in which <br /> <br />I <br /> <br />usea of the exhibiu. <br /> <br />I <br /> <br />f1oodin'loccurs. In the spdn'?";,e,, the strea"", are hi.,!h with runoff fro.. <br /> <br />Maps <br /> <br />I <br /> <br />sno""",lt, coupled with "prinll r"ins, high wat..T could persist for s everal <br /> <br />For p1annin~ and flood zon" re~ul"tion purposes, the 1000-ye..r flood i. <br /> <br />I <br /> <br />1 <br /> <br />days. Durin'l the late su~r ~nths ,,;,en the strea~ ar.. normally 10", <br /> <br />used Incal1y aR th.. baa.. flood. I....ger flood., aueh as the 500-ye.u Hnod <br /> <br />.unoff frO<a thundersto.ms will recede in.a few h>>,..... <br /> <br />a~e aho considered in the p\annin~ and .....na~e"'ent nf flood-prone I\reas. <br /> <br />I <br /> <br />1 <br /> <br />Flood Hazard Areas <br /> <br />J <br /> <br />The tote! flood hnard area On all teaehes subject to inundation by the <br /> <br />The 100-y....r ..nd 500-ye..~ .."..nts ar(" outlined on the Flood Il.aurd Are.a M.aps. <br />In .....ny inst..nc,," the (lOJur Hmit. of th.. 100- and 500-year fh.",ds will <br /> <br />I <br /> <br />100-ycar flood under present eonditions is about 371.1 acres C152.7ha l. <br /> <br />spp"..r "" on.. ;ine on eh.. "'''ps. '('IIi. is due to tile topo~raphlc relief and <br /> <br />1 <br /> <br />J <br /> <br />The are.. incr"nes to about 501.5 aeres (203.1 ha) for the 500-y"ar flood. <br /> <br />sli~ht differenee in elevation bet..e..n the two flood eve..es. It ,,"ould be <br />noted chn .are:lS sho"", as fIo>>ded on the mapa....y vary "lOre or I".... ..i.th <br /> <br />I <br /> <br />The foltowin'ltabulation for areas flooded isby.t1,&dyreaehforcheSnuth <br /> <br />1 <br /> <br />fork and Rio Grande. <br /> <br />J <br /> <br />Rivn <br /> <br />StudyR....cb <br />". <br /> <br />Flood Haza.d <br />lOO-'{earf'lood <br />Actea (H..ceares) II <br /> <br />Area <br />500-'{..arFlood <br />Aeres (Heetares) <br /> <br />presentfieldeonditi.ons. rordecailed i.nfoUlation. HoodeLevations.hould <br />be deter..i.nedat specifie 10c.tionsandeheeked..ithfi..ldRurveys. The <br /> <br />tOpO~f"ph;c ~ppin~ WSR obtained Photo~~smmetrienllv frO'l1 ac.ial Dhntn~.,,~hy <br /> <br />I <br /> <br />SOuth!'nrk <br />Rio Grande <br /> <br />1 <br /> <br />49.0 (I~.II) <br />1.0 (0.4) <br />12.5 (5.1) <br />62.5 (25.3) <br />13 <br /> <br />57.5 <br /> <br />(23.3) <br /> <br />flown Jllne 16, 1975. <br /> <br />I <br /> <br />, <br />J <br /> <br />4.' <br />19.9 <br />ii:9 <br /> <br />(l.8) <br />(8.1) <br />(33.2) <br /> <br />l' <br /> <br />Subtotal <br /> <br />. <br />