Today I brought hoses to the garden plot and tested the water system. Two hoses from home were enough to reach my plot. The onions have emerged, but the potatoes aren't up yet. One website (http://www.gardening.cornell.edu/homegardening/scenec6be.html) estimates 14-28 days for potatoes to emerge, depending on soil temperature. My potatoes were planted on April 17th, so hopefully they'll emerge in the next 10 days.