@azdavidr posted some excellent info in Using Web Soil Survey to define your soil settings, so I’d suggest taking a look at that. It explains how to use the web soil survey to get available water as a ratio, which is the important number to enter into the Advanced settings. Sandy clay loam is somewhere between sandy loam and clay loam, so you could pick whichever is closer (see the soil texture triangle at http://support.rachio.com/article/262-choosing-soil).
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