subirrigation
noun
                                                                                                                            
                                                            sub·ir·ri·ga·tion
                    
                                                                                                              
                                                                                                                                  ˌsəb-ˌir-ə-ˈgā-shən 
                                                      
                                                          
            
                                
              
          
                                                      : irrigation below the surface (as by a periodic rise of the water table or by a system of underground porous pipes)                                      
                
                    
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  Merriam-Webster unabridged




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