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We present an extragalactic survey using observations from the Atacama LargeMillimeter/submillimeter Array (ALMA) to characterise galaxy populations up to$z=0.35$: the Valpara\'iso ALMA Line Emission Survey (VALES). We use ALMABand-3 CO(1--0) observations to study the molecular gas content in a sample of67 dusty normal star-forming galaxies selected from the $Herschel$Astrophysical Terahertz Large Area Survey ($H$-ATLAS). We have spectrallydetected 49 galaxies at $>5\sigma$ significance and 12 others are seen at lowsignificance in stacked spectra. CO luminosities are in the range of$(0.03-1.31)\times10^{10}$ K km s$^{-1}$ pc$^2$, equivalent to $\log({\rmM_{gas}/M_{\odot}}) =8.9-10.9$ assuming an $\alpha_{\rm CO}$=4.6(K km s$^{-1}$pc$^{2}$)$^{-1}$, which perfectly complements the parameter space previouslyexplored with local and high-z normal galaxies. We compute the optical to COsize ratio for 21 galaxies resolved by ALMA at $\sim 3$."$5$ resolution (6.5kpc), finding that the molecular gas is on average $\sim$ 0.6 times morecompact than the stellar component. We obtain a global Schmidt-Kennicuttrelation, given by $\log [\Sigma_{\rm SFR}/({\rm M_{\odot}yr^{-1}kpc^{-2}})]=(1.26 \pm 0.02) \times \log [\Sigma_{\rm M_{H2}}/({\rmM_{\odot}\,pc^{-2}})]-(3.6 \pm 0.2)$. We find a significant fraction ofgalaxies lying at `intermediate efficiencies' between a long-standing mode ofstar-formation activity and a starburst, specially at $\rm L_{IR}=10^{11-12}L_{\odot}$. Combining our observations with data taken from the literature, wepropose that star formation efficiencies can be parameterised by $\log [{\rmSFR/M_{H2}}]=0.19 \times {\rm (\log {L_{IR}}-11.45)}-8.26-0.41 \times\arctan[-4.84 (\log {\rm L_{IR}}-11.45) ]$. Within the redshift range weexplore ($z<0.35$), we identify a rapid increase of the gas content as afunction of redshift.

VALES: I. The molecular gas content in star-forming dusty H-ATLAS galaxies up to z=0.35