Phaampiiwwan dhiyeessaa gatii ol'aanaa (high-pressure supply pumps) qabeenya murteessaa dhaan mootummaa cimsaa fi bakkawwan bu'uura dhangala'aa (dewatering systems) keessaatti, akkuma bakka bu'aa (power source) uumuu kan eductor ykn ejector wells dha. Phaampiiwwan kanneen bifa addaa qabu, bishaan gatii ol'aanaa yookaan hawaa cufaa kompreshed (compressed air) fi hiikkaa murteessuu dhala'eetti danda'uu ni dhiyeessuu. Kunis dandeetti dhaabbilee bishaanii garbuu dhangala'aa bifa hojiirra ooluudhaan, bu'uurri dhoowwa kana deeggara. Phaampiiwwan gatii ol’aanaa faayidaan jijiirama gatii waloka dhugaa deeggaruu (differential pressure principles) irratti hojii gaggeessuu, eductorii haala gaariin bishaan kan naaqqabaa fageenya dhangala'aa tajaajiluudhaan, daangaa dhaabbii humna hojiirra oolchuuf faayidaa ta'e qabu. Dhiheessii fi hojii phaampiiwwan gatii ol’aanaa keessaa haala geejjiba haala qabeenya hawaasummaa (hydrogeological conditions) dhangala'aa dhabeeyyiilee gamtokoo akkasuma raawwatamuuf, dhoqqoo dabaree (permeability), ga'aa dhaabbilee dhangala'aa, fi dhummaqa piizometrikii (piezometric head) barbaachisaa ta'e. Hojjettoonni gatii ol'aanaa filachuuf dhangala'aa dhoowwachuu, qubachiisa qufacuu, fi jijjiirraa gatii piizometrikii ganda bu'uuraaf barbaachisaa ta'e dhiyeessu qabu. Phaampiiwwan dhiyeessaan gatii ol'aanaa ni gargaara koos eductor nozzles fi venturi mechanisms wajjiin walitti hidhataudhaan, dhiibbaa naannoo dirree naaxina irraa dhiiguu kan shyeyyan dha, kuma kabalawwan (fine-grained soils), silttii, fi meeshaa cufaa ta'etti yeroo bu'uura ofiif faayidaa ta'e akkasuma ta'uuf. Phaampiiwwan yeroo hunda hojiirra oolanii kophii haala qabeenyi jijiiramaa dha, balaa dhangala'aa giddugaleessaa, fi kun immoo bu'uura dhangala'aa irraan gaf’achuuf baay’ee murteessaadha. Hojii yeroo baay’ee dhaabbilee cabsuuf carraan dhiheessuu gatii ol’aanaa keessatti hojii dhugaa saanduqa dhoowwachuu, caisson dhangala'aa, daawwattoo diyaafiram wall gochuu, fi hojiilee cimaa gatii ol’aanaa keessatti walitti hidhata irraan kan ka'uu hojiilee qabatamaa godhachuuf murteessaa dha. Gabaabni hojiiwwan kanneen bu'aagu (basement construction), daandii gubbaa (subway tunnels), bu'ura off-shore, fi deeggari chaarjee (remedial underpinning) irratti langee gadaa dhangala'aa dabalaa buufataaleedhaaf hawaasaa raawwachiisuu fedha. Phaampiiwwan dhiyeessaa gatii ol'aanaa jibbaa gurguddooaraqaa (abrasive particles) fi dhagaa toora suuqaa kanneen dhoowwadi dhagaa marmaaraa (solids) yaadata, kuusaa aadaa cimaan, gurguddaa bifa ofeeggannoodhaan gorsa argachuu qabu. Filannoo sirrii, miseensa, fi hojii phaampiiwwan dhiyeessaa gatii ol’aanaa jijiirama projektiwwan, kaffaltii yeroon, fi milkaa'ina guutuu keessatti xiyyeefannaa godhachuu dandeessisu.
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