80 IRRIGATION FARMING. 



half of the clam was puddled and spread in thin layers, 

 and each day a herd of goats was driven onto the bank 

 and kept moving the entire time. There is three feL't 

 thickness of quarry-broken riprap on the upper side to 

 protect the dam from action of the waves. Where the 

 creek channel passes under the dam a semi-circular arch 

 rests on bed rock to carry off any sudden rise which 

 might have occurred during construction, and also to 

 provide room for the pipes to the basin below. This arch 

 is built solid, full of concrete near the upper end, at the 

 same time walling in the pipes. From the opening to 

 the arch and extending upward' there is a well for the 

 purpose of taking the supply at any desired level, thus 

 relieving any strain at the conduit, and serving also as 

 a manhole. 



