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We present the KMOS-CLASH (K-CLASH) survey, a K-band Multi-ObjectSpectrograph (KMOS) survey of the spatially-resolved gas properties andkinematics of 191 (predominantly blue) H$\alpha$-detected galaxies at $0.2\lesssim z \lesssim 0.6$ in field and cluster environments. K-CLASH targetsgalaxies in four Cluster Lensing And Supernova survey with Hubble (CLASH)fields in the KMOS $IZ$-band, over $7'$ radius ($\approx2$-$3$ Mpc)fields-of-view. K-CLASH aims to study the transition of star-forming galaxiesfrom turbulent, highly star-forming disc-like and peculiar systems at$z\approx1$-$3$, to the comparatively quiescent, ordered late-type galaxies at$z\approx0$, and to examine the role of clusters in the build-up of the redsequence since $z\approx1$. In this paper, we describe the K-CLASH survey,present the sample, and provide an overview of the K-CLASH galaxy properties.We demonstrate that our sample comprises star-forming galaxies typical of theirstellar masses and epochs, residing both in field and cluster environments. Weconclude K-CLASH provides an ideal sample to bridge the gap between existinglarge integral-field spectroscopy surveys at higher and lower redshifts. Wefind that star-forming K-CLASH cluster galaxies at intermediate redshifts havesystematically lower stellar masses than their star-forming counterparts in thefield, hinting at possible "downsizing" scenarios of galaxy growth in clustersat these epochs. We measure no difference between the star-formation rates ofH$\alpha$-detected, star-forming galaxies in either environment afteraccounting for stellar mass, suggesting that cluster quenching occurs veryrapidly during the epochs probed by K-CLASH, or that star-forming K-CLASHgalaxies in clusters have only recently arrived there, with insufficient timeelapsed for quenching to have occured.

K-CLASH: spatially-resolving star-forming galaxies in field and cluster environments at $z \approx 0.2$-$0.6$