Thanks for the detailed explanation. And in fact it looks like your interpretation is pretty spot on. Based on my jar, you said loamy sand (0.50in/hr). The Soil Map for that section of my lawn came back as the following, which is basically sandy loam / loamy sand:
KnuB Knickerbocker - Urban land, Knickerbocker substratum complex, 0 to 8 percent slopes
National map unit symbol: w8q1
Ap - 0 to 8 inches: fine sandy loam
Bw - 8 to 23 inches: fine sandy loam
BC - 23 to 34 inches: loamy fine sand
C1 - 34 to 42 inches: loamy fine sand
C2 - 42 to 51 inches: loamy fine sand
C3 - 51 to 60 inches: loamy fine sand
But the Soil Physical Properties -> Available Water Capacity states 0.10 inches per inch weighted average for all soil layers (current Available Water setting is 0.07). So is it correct to set my soil type to either loamy sand or sandy loam, and change my Available Water from 0.07 to 0.10?
Or if you know of a guide for using the Web Soil Survey to set Rachio values, please let me know.