Kev tiv thaiv cov dej ntws tawm ntawm cov channel tuaj yeem txo cov dej ntws tawm, txhim kho lub peev xwm ntawm kev thauj mus los ntawm cov dej thiab txo lub sijhawm xa dej, thiab lwm yam. Nws tuaj yeem ua lub luag haujlwm ntawm kev tiv thaiv yaig, tiv thaiv siltation, tiv thaiv kev sib tsoo thiab ruaj khov kwj dej txaj kom muaj kev nyab xeeb ntawm kev xa dej thiab txhim khu kev txhim kho ntawm thaj chaw dej thiab lwm yam. Raws li hom khoom siv, lub hauv ob sab phlu tuaj yeem muab faib ua peb hom: nruj, yoog raws thiab nruj-hloov. Cov ntaub ntawv hauv ob sab phlu yog cam khwb cia hauv qhov chaw lossis precast qhob slab thiab masonry, cov ntaub ntawv hloov tau yooj yim yog cov yas zaj duab xis, cov khoom sib xyaw geomembrane thiab asphalt linoleum.
Channel composite hauv ob sab phlu yog nteg ib txheej ntawm saj zawg zog membrane nyob rau hauv lub rigid pob zeb slab. Tam sim no, cov khoom siv zaj duab xis hloov tau yog feem ntau yog ib zaj duab xis yas lossis geomembrane, uas yog cov dej tsis zoo thiab tsis muaj dej pov thawj nyob rau hauv qhov kub thiab txias. Kev tso cov ntaub ntawv hloov pauv hauv qab cov pob zeb pob zeb hauv lub sijhawm luv luv kom txo tau cov xau ntawm cov channel los txhim kho kev siv coefficient ntawm cov dej ntws zoo, tab sis kom Frost heave tsuas yog ua si qee qhov tsis ncaj thiab me me.