Ambaliya da haɓaka kogin Tulsa

Haɗuwa da yanayin a kogi Maisa ambaliya cikin Tulsa, yankin Oklahoma sun haifar da ambaliyar ruwa akai-akai, *musamman* a kusa da koguna waɗanda galibi ke zubar da yankin. An kafa birnin a saman wani bluff akan kogin Arkansas. Don haka, tsayin ya kare yawancin mazaunan da dukiyoyinsu daga lalacewa lokacin da kogin ya yi ambaliya. Koyaya, ya zuwa ƙarshen karni na 20 haɓakar yawan jama'a ya matsa kusa da kogin, kuma filayen da ke yammacin Arkansas sun fara haɓaka suma. Ambaliyar ta saba haifar da asarar dukiya da kuma asarar rayuka. A cikin shekarata 1920s, ambaliyar ruwa na Arkansas na yanayi ya fara haifar da mummunar lalacewa da asarar rayuka. Tun lokacin da aka kafa shi, shugabannin birni sun amsa irin waɗannan abubuwan ta hanyar sake ginawa da maye gurbin dukiyoyin da aka lalata *a wurin* . Sai a shekarar 1970 gwamnatin birnin ta fara bullo da dabarun dakile ambaliyar ruwa ko kuma rage asarar dukiyoyi da kuma hana asarar rayuka. Wannan labarin ya bayyana wasu fitattun ambaliyar ruwa a Tulsa, sannan hanyoyin ragewa da dabarun sarrafawa waɗanda suka samo asali daga gare su.

Ambaliyar ruwa ta ci gaba da yin barazana ga rayuka da dukiyoyi, yayin da birnin ya mamaye filayen noma da ke kewaye. Hukumomin birni sun yanke shawarar cewa ƙa'idodin Tarayya na lokacin ba su isa ba don sarrafa yanayin gida kuma sun fara haɓaka ƙarin buƙatu. Shirin Tulsa ya samo asali kuma a yanzu ya shafi dukkanin magudanar ruwa, gami da sauran al'ummomi a cikin babban birnin Tulsa .

Ko da yake ba za a iya hana aukuwar ambaliya kwata-kwata ba, Hukumar Ba da Agajin Gaggawa ta Tarayya (FEMA) da wasu kungiyoyi da dama sun amince da shirin shawo kan ambaliyar Tulsa a matsayin nasara. Za a ci gaba da kokarin shawo kan lamarin muddin mutane suna zaune a wurare masu rauni ko rashin ƙarfi.

## Manyan ambaliyar ruwa
Bayanan ambaliya ba su da yawa kafin shekarata 1900. A cikin 1908, shekara guda kacal bayan zama jiha, ambaliyar kogin Arkansas a Tulsa ya haifar da asarar $250,000 ($ 6.45 miliyan a cikin dala 2019). Garin ya kasance a saman kogin kogin, don haka ya kare ambaliya. Sai dai gadar layin dogo ta tsallake rijiya da baya, lamarin da ya kawo cikas ga zirga-zirgar jiragen kasa zuwa yamma har sai an sauya gadar. 

### 1923 ambaliya
A shekara ta 1920, yawan man fetur ya haifar da ci gaba mai sauri wanda aka gina gidaje a kan ƙananan ƙasa kusa da kogin Arkansas, A ranar 13 ga Yuni, shekarata 1923, kogin ya mamaye wadannan ƙananan wurare, ya haifar da $ 500,000 a cikin diyya ($ 9.83 miliyan a cikin dala 2019). ), da kuma barin gida 4,000. Ambaliyar ta hada da aikin ruwa na Tulsa, wanda ke a yanzu a Newblock Park, An gina sabbin ayyukan ruwa a kan tudu mai tsayi a arewa maso gabashin Tulsa, kusa da Bird Creek . Wannan    yanki ya zama Mohawk Park, ɗayan manyan wuraren shakatawa na birni na ƙasar. Har ila yau, birnin ya fitar da shirinsa na shawo kan ambaliyar ruwa na farko, inda ya yi kokarin sanya gidaje a kan tudu da kuma tanadin guraben wuraren shakatawa. 

### 1943 ambaliya
Wani ambaliya a kan kogin Arkansas ya yi barazana ga matatun mai a yammacin Tulsa a  shekarata 1943. Rundunar Sojojin Amurka na Injiniya (USACE) nan da nan ta gina matsuguni a kusa da matatun, waɗanda aka ɗauka suna da mahimmanci ga sojojin Amurka a yakin duniya na biyu . Wani tanadi a cikin Dokar Kula da Ambaliyar Ruwa ta Mississippi ta 1928 ta ba da izini ga USACE don gina madatsun ruwa da lefi kamar yadda ake buƙata don sarrafa ambaliya.  Duk da haka, ambaliyar ta kashe mutane 21, tare da raunata 26, ta kuma bar kusan 4,000 da gidajensu. Ko da yake ba a samu barnar kudi ba, gidaje 413 sun lalace sannan 3,800 sun lalace. 

### 1970 ambaliya
Kamar yadda Tulsa ta faɗaɗa cikin karkarar da ke kewaye bayan WWII, ambaliya na yankunan birane akai-akai, yawanci kowacce shekara biyu zuwa huɗu. A cikin 1966, Tulsa ta mamaye magudanar ruwan Mingo Creek. Ambaliyar Ranar Mata ta a shekarar 1970 a Tulsa ta haifar da asarar dala 163,000 ($ 1.07 miliyan a cikin dala miliyan 2019) zuwa yankunan da ke ci gaba da sauri tare da kogin Mingo da Joe a gabashin birnin. Har yanzu, farfadowa ya ƙunshi gyara ko maye gurbin gine-ginen da ambaliyar ruwa ta mamaye a wurarensu na asali. 

### 1974 ambaliya
Ambaliyar ruwa uku ta faru a watan Afrilu da Mayu shekarata 1974. An kiyasta lalacewar dala $744,000 ($3.86 miliyan a cikin dala miliyan 2019) tare da Bird Creek. A watan Yuni, ambaliyar ruwa ta afku tare da Fry, Haikey, Joe da Mingo Creek. Wannan lokacin an kiyasta asarar sama da dala miliyan 18 ($93.30 miliyan a cikin dala 2019). Mingo Creek ta sake yin ambaliya a ranar 19 ga Satumba, shekarata 1974.  

### 1976 ambaliya
Ambaliyar Ranar Tunawa da Mutuwar Shekara ta 1976 ta nuna wani ci gaba a cikin binciken Tulsa na neman mafita. Ruwan ruwa mai tsawon sa'o'i uku, mai inci 10 ya afku a kan magudanar ruwan Mingo, Joe da Haikey. Sakamakon ambaliya ya kashe mutane uku tare da haddasa asarar dala miliyan 40 ($179.65 a dala miliyan 2019) ga gine-gine sama da 3,000. 

### 1984 ambaliya
Gaban sanyi wanda ya tsaya kan yankin Tulsa a ranar 26-27 ga Mayu, shekarata 1984 ya faɗi tsakanin inci 6 zuwa 15 (15 da 38).&nbsp;cm) ruwan sama ya mamaye sassa da dama na birnin. Ambaliyar ta kashe mutane 14 tare da yin asarar dala miliyan 180 (dalar Amurka miliyan 442.72 a shekarar 2019). Yankunan da ke kusa da Mingo Creek a gabashin Tulsa da Cherry Creek a yammacin Tulsa sun kasance da wahala musamman. 

### 1986 ambaliya
 A cikin Satumba shekarata 1986, ragowar guguwa a kudu maso yammacin Mexico sun isa yankin Tulsa kuma sun haifar da ruwan sama na inci 24 (61).&nbsp;cm) arewa maso yamma na Keystone Lake .  An yi ruwan sama mai yawa cikin kankanin lokaci, ta yadda za a iya cewa matakin tafkin zai kai kololuwar dam. Rundunar Sojojin Amurka (USACE) na buƙatar buɗe ƙofofin ambaliya tare da sakin kusan cfs 300,000 na ruwa a cikin Kogin Arkansas. Wannan adadin zai haifar da rikodin ambaliya tare da kogin daga Keystone zuwa Muskogee. Shiyasa Mutane da yawa da ke zaune kusa da kogin a Tulsa sun yi gudun hijira bisa radin kansu. An ba da umarnin ficewa na tilas a Jenks da Bixby.  Wani lefe mai zaman kansa a Yammacin Tulsa ya gaza, wanda ya haifar da kiyasin dala miliyan 1.3 (dala miliyan 3.03 a cikin dala 2019). Gine-gine 64 ne suka lalace, ciki har da goma sha uku da za a rushe.  Sauran yankunan da ke kusa sun ba da rahoton barna kamar: $32.5 miliyan ($75.78 a dala miliyan 2019) a cikin Sand Springs da dala miliyan 13.4 (dala miliyan 31.24 a cikin dala 2019). Gundumar Tulsa ta ba da rahoton asarar dala miliyan 63.5 ($148.06 miliyan a cikin dala 2019). 

### 2019 ambaliya
A cikin watan Mayun shekarata 2019, jerin tsawa mai tsanani sun yi ruwan sama a arewacin Oklahoma. Ruwan ya gangara daga koramai zuwa tafkin Keystone . Dangane da martani, Rundunar Sojojin Amurka na Injiniya sun fara sakin ruwa daga Dam ɗin Keystone zuwa Kogin Arkansas .

A shirye-shiryen sake zagayowar guguwa, Rundunar Sojojin Amurka ta rage yawan ruwan da ake sakowa a cikin kogin, tare da fatan ba da damar ruwanta ya ja da baya don samun karin ruwan sama.

Guguwar tsawa ta biyu ta yi ta jefar da yawan ruwan sama da ya haifar da guguwa da yawa. Wannan karin ruwan sama kuma ya mamaye tafkin Keystone, da dai sauransu, kuma an tilastawa Rundunar Sojoji suka bude kofofin kara.

Kashegari, yayin da ruwa ya ci gaba da cika tafkin, Rundunar Sojan ta yi ƙoƙari don daidaita ruwan shiga da barin tafkin. Duk da haka, ba su da wani zaɓi illa ci gaba da ɗaga ƙofofin sama ko ƙasa da matakin ruwa ya wuce madatsar ruwa. 

Sakamakon kwararar ruwa ya fara a barazana ga unguwanni da birane. Yankunan Sapulpa, Kudancin Broken Arrow (wanda aka fi sani da Indian Springs), da Bixby, Oklahoma sun nutse.

A ranar 22 ga Watan Mayu, an ɗaga ƙofofin daɗaɗa girma cikin yini. An kori Webbers Falls yayin da garin ya fara nutsewa cikin ruwa. 

Ruwan da ke gefen kogin Tulsa ya fara tashi sosai, wanda hakan ya sa makarantun gwamnati na Sand Springs da Jenks soke azuzuwa a sauran shekarar karatu saboda matsalar ambaliyar ruwa. An fara bullowa a cikin da kewayen yankin Tulsa, inda aka samu rahotannin motoci da ke shiga cikinsu.  Tsarin gine-ginen da aka gina tare da bakin kogi, kamar Kogin Ruhun Casino da Riverwalk, an rufe su da gangan kuma an fara tattara su a cikin kogin  da sauran sanannun wuraren ambaliya kamar Tulsa Zoo . 

Gwamna Kevin Stitt da Magajin Garin Tulsa GT Bynum sun yi shawagi a kan metro na Tulsa don duba ambaliyar tare da ayyana dokar ta baci ga kananan hukumomi  guda 66. 

Yayin da rana ta koma dare, wani guguwa mai tsananin gaske ya fara tashi a kusa da birnin Oklahoma, ya nufi Tulsa. Barges sun balle a kan kogin da ke kan hanyar zuwa Makullin Falls na Webbers da Dam, suna barazanar yin karo a cikin ginin.  Jiragen ruwan sun bace ne da dare kuma ba a gano su ba sai da safe.

A safiyar ranar 23 ga Mayu, an ci gaba da ɗaga kofofin ambaliya na Keystone yayin da Ruwan ya kai 100%, yana ƙara yawan kwarara zuwa cfs 221,000 tare da shirye-shiryen haɓaka wannan zuwa 250,000 cfs da tsakar rana. Hukumar Kula da Yanayi ta Kasa a Tulsa ta haɓaka matakin hasashen kogin Arkansas daga ƙafa 21 zuwa ƙafa 23, wanda hakan ya sanya kogin cikin babban matakin ambaliya kuma ƙafar 2 kawai na jin kunyar matakan da aka kai a cikin Oktoban shekarar 1986. 

A halin da ake ciki dai, jiragen ruwan sun sake ballewa jim kadan kafin karfe 11 na safe, inda suka sake yin barazana ga dam din. Jim kadan kafin azahar ne jiragen ruwan suka yi karo da dam din suka nutse. Bayan duba dam din, an bayyana cewa ya samu barnar kadan.

A ranar 24 ga Mayu, Gwamna Stitt ya faɗaɗa dokar ta-baci don haɗa dukkan larduna guda 77 na Oklahoma. Shugaba Trump ya amince da ayyana bala'in a washegari, yana ba da umarnin taimakon tarayya don ƙara martanin Jiha, kabilanci, da na cikin gida. 

Rundunar Sojin ta yi niyyar ci gaba da sakin a kan cfs 250,000 har zuwa ranar Lahadi, 26 ga Mayu. Bayan karin tsawa da aka yi a daren ranar 24-25 ga Mayu, rundunar ta sauya shirinsu na ci gaba da tafiya a haka har zuwa ranar Laraba, 29 ga Mayu kuma ta ba da shawarar karin hazo na iya haifar da wani tsawaitawa.

Magajin garin Bynum ya kuma bukaci 'yan kasar da ke samun kariya daga lefes da su fara yin tsare-tsare na son rai na ficewa. Ya bayyana cewa, duk da cewa a halin yanzu leve din suna gudanar da aikinsu, amma ba a taba gwada su ba.

Ƙarin guguwa a cikin dare na Mayu 25-26 ya sa Corps su tsawaita jadawalin sakin su wata rana zuwa 30 ga Mayu. Sun kuma ƙara adadin sakin a cikin Arkansas da farko zuwa 265,000 cfs sannan kuma sun haɓaka shi zuwa 275,000 da safe. 

A cikin farkon sa'o'i na Ranar Tunawa da Tunawa da Mutuwar, duk da haka wani zagaye na mummunar guguwa ya sake yin hazo tare da babban kogin Arkansas a arewa maso yamma da arewa ta tsakiya Oklahoma da kuma kudancin tsakiyar Kansas.

A ranar 28 ga Watan Mayu, tafkin a ƙarshe ya shawo kan wata babbar matsala kuma ya fara komawa baya. Guguwar da aka yi hasashe ta tafi kudancin dam ɗin, wanda ya ba da damar ruwan tafkin ya daidaita.

Kashegari, ko da wani zagaye na guguwa ke tafe a Tulsa, Rundunar Sojan Sama ta sanar da cewa za ta fara yanke sakewa a madatsar ruwa. Da karfe 4 na yamma, an rage kwararar zuwa cfs 265,000 sannan a rage 10,000 cfs kowane awa 6. Manufar su shine a rage adadin zuwa cfs 150,000 a ranar Asabar da 100,000 cfs farkon mako mai zuwa.  A halin yanzu, guguwar da aka yi a Tulsa ta kara tsayin kogin da inci kusan 6, amma kuma bai yi tasiri sosai a tafkin Keystone ba. Duk da haka, cikin sauri kogin ya koma kasa da tsayin da ya gabata.

## Ragewa da kariya
Gwamnatin Tulsa ta mayar da martani ga ambaliya ta shekarar 1970 ta hanyar shiga cikin "tsarin gaggawa" na Shirin Inshorar Ambaliyar Ruwa ta Kasa (NFIP) da kuma yin alƙawarin ɗaukar ka'idojin ambaliyar ruwa na tarayya. A watan Agustan shekarata 1971, NFIP ta fitar da taswirar ƙimar toshe. Bayan wata guda, a Ranar Ma'aikata, Flat Rock, Bird da Haikey koguna sun yi ambaliya, wanda ya shafi al'ummomin karkara da yawa. A cikin Disamba, Bird Creek ta sake yin ambaliya. Daga nan Tulsa ta shiga cikin shirin “na yau da kullun” na NFIP, ta ɗauki sabon ƙayyadaddun ambaliya na shekaru 100, kuma ta yi alƙawarin daidaita yadda ake amfani da filayen ambaliya. 

Bayan ambaliyar ruwa guda uku da aka yi a shekarar 1974, wadanda abin ya shafa sun bukaci da a dauki matakin da ya dace daga birnin, wanda a cewarsu ba ya aiwatar da ka’idojin NFIP. Sun yi kokarin dakatar da ci gaba, don guje wa barnar ambaliyar ruwa har sai an magance matsalolin da ake da su. Masu haɓakawa sun yi kakkausar suka, inda suka fara muhawara game da gudanar da ambaliyar ruwa, wanda ake kira "Babban Yaƙin Magudanar ruwa" daga kafofin watsa labaru na cikin gida, wanda ya ɗauki shekaru da yawa. Birnin ya zo don ganawa da manajoji tare da shirin fadada wani yanki na Mingo Creek. Wani bangare na shirin ya hada da cire kayan da suka lalace. An kwashe gidaje 33 a hannun dama kafin ambaliyar ruwa ta biyo baya. 

Ambaliyara a shekarata 1984 ta nuna cewa masu kula da gaggawa ba za su iya samun cikakkun bayanai da sauri ba game da ci gaban ambaliya. Wannan gaskiya ne a ko'ina cikin jihar, da kuma a Tulsa. Bayanai daga radar filin jirgin sama, sabunta sa'o'i, bai isa ba don biyan bukatun manajoji. Jami'ar Oklahoma da Jami'ar Jihar Oklahoma sun haɗa kai tare da Binciken Yanayin yanayi da sauran hukumomin jama'a da masu zaman kansu don ƙirƙirar Oklahoma Mesonet . Wannan tsarin yana tattara bayanan yanayi (misali, saurin iska, ruwan sama, zazzabi) kowane minti a ƙalla 5 daga tashoshin Mesonet 120 a duk faɗin Oklahoma. Masu tsara shirin gaggawa yanzu za su iya sa ido kan bayanan yanayi na zamani kafin isowar guguwar da ke gabatowa. Labarin ya ambato wani jami'in Hukumar Ba da Agajin Gaggawa ta Tulsa yana cewa ma'aikatansa suna amfani da Oklahoma Mesonet a kowace rana. 

a cikin shekarata 1985, Tulsa ta daidaita alhakin duk ambaliya na birni, magudanar ruwa, da shirye-shiryen ruwan guguwa a cikin Sashen Kula da Ruwan Ruwa. An kafa kuɗin amfani da ruwan sama ta hanyar doka a cikin shekarar 1986 don gudanar da shirin. Ana buƙatar masu duk kadarorin da ke cikin birni su biya kuɗin, wanda aka kafa ta hanyar doka akan $ 2.58 kowace wata. Ana harajin kadarorin kasuwanci a $2.58 kowace wata ga kowane    na m surface.  Dokar ta ware gabaɗayan kuɗin na musamman don ayyukan kula da ambaliyar ruwa da ruwan guguwa, tare da tabbatar da samar da tsayayyen kudade don kulawa da gudanarwa. 

Shirin kare ambaliyar ruwa na Tulsa yana da manufofi guda uku: hana sababbin matsaloli; gyara matsalolin da ke akwai; inganta aminci, muhalli da ingancin rayuwa. 

Jami'an birnin sun yi imanin cewa ƙa'idodin da NFIP ta gindaya ba su isa ba, dangane da gogewar Tulsa a baya. Tulsa yana buƙatar fayyace filayen ambaliya bisa ga ci gaban da ake tsammani a gaba, maimakon yanayin ci gaba a lokacin. NFIP kuma yana buƙatar mafi ƙanƙanta matakin gine-gine a cikin filayen ambaliya ya kasance ko sama da tsayin ambaliya na shekaru a ƙalla 100. Tulsa yana buƙatar kuma yana tilasta ƙarin ƙafa ɗaya (30.5&nbsp;cm) na allon kyauta sama da hawan ambaliya. Kafin a canza kadarorin da ke cikin filayen ambaliyar ruwa, dole ne mai shi ya sami izinin ci gaban magudanar ruwa. 

## Gane ci gaba
A farkon shekarata 1990s, FEMA ta sanya Tulsa ta farko a cikin al'umma don shirin kula da ambaliyar ruwa. barin Tulsans su ji daɗin ƙimar inshorar ambaliyar ruwa mafi ƙasƙanci. An kuma karrama shirin da lambar yabo ta FEMA ta shekarar 1992 da ta yi fice a ma'aikatan gwamnati; da Ƙungiyar Manajojin Ambaliyar Ruwa ta Jiha ta ba Tulsa lambar yabo ta gida sau biyu don Ƙarfafawa. 

FEMA ta ƙara ƙimar al'ummar Tulsa daga Aji na 5 zuwa Aji na 3, wanda hakan ya sa Tulsans suka cancanci rangwame kashi 35 akan ƙimar inshorar ambaliyar ruwa. Ƙimar aji na 5 da ya gabata ya ba da rangwamen kashi 25 cikin ɗari. Ana daidaita ma'auni na lokaci-lokaci don nuna raguwar haɗarin al'umma ta hanyar ƙoƙarinta na inganta "...bayanin jama'a, taswira da ka'idoji, shirye-shiryen ambaliya da rage lalacewar ambaliya. Rangwamen yana cikin haɓaka kashi biyar daga Class 9 (kashi biyar) zuwa Class 1 (kashi 45)." Tun daga shekarata 2000, Tulsa ita ce kawai al'ummar Amurka da aka ƙima a matsayin Class 3. 

Takamaiman ayyuka da FEMA ta ambata sune:"...Samun kusan kaddarorin da ke fama da ambaliyar ruwa da kuma adana fiye da kashi ɗaya bisa huɗu na ambaliyarsa a matsayin fili; ƙaƙƙarfan ƙa'idodin gini, gami da buƙatun yanayin aminci na ƙafa biyu ( freeboard) a cikin gine-ginen ambaliya; da kuma wayar da kan jama'a don ba da shawara ga mazauna haɗarin ambaliya da ba da mafita na ragewa da taimakon fasaha." 

## Bayanan kula

## Ci gaba da karatu
Hukumar Ba da Shawarar Ruwa ta Tulsa Stormwater da Sashen Ayyukan Jama'a.  "Daga Rufin zuwa Kogi: Hanyar Tulsa zuwa Filin Ambaliyar Ruwa da Gudanar da Ruwa."  Mayu, 1994.  An shiga Afrilu 7, 2017.

Marshall, Timothy P. "Tasirin Ƙarfafa Ƙarfafa Ƙwararrun Ƙwararru na Mingo Creek Watershed."  (1984) An dawo da shi Mayu 25, 2014

"Mooser Creek Greenway: Maidowa da Kiyaye Rafi na Tarihi." Flanagan, John D. An Shirya Don Birnin Tulsa, Oklahoma. Afrilu 2004. An dawo da Yuni 15, 2014.

Bergman, Deroy L. da kuma Robert L. Tortorelli. "Ambaliya daga Mayu 26-27, 1984 a Tulsa, Oklahoma." USGS Hydrologic Atlas 707. 1988. An shiga Afrilu 7, 2017.

## Manazarta