What about a "walking" sprinkler? It would need to be turned around each day for the next day's lap but you might be able to make a track to have it follow the L shaped yard. Or what about a couple of the sprinkler hoses that are flat with holes punched in it that shoot up and out? Neither of these methods can be mowed over but unless you have a fence and mount sprinklers on the top, I don't know of a system that can be mowed over.
Walking type: http://www.amazon.com/Nelson-1865-Ra...ctor+sprinkler
Hose type: Amazon.com : Andrews 50-Foot 2 Tube Sprinkler Hose 10-12348 : Garden Hoses : Patio, Lawn & Garden
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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