A small lake close to Lake Biwa is called ‘Naiko’.  There was a constriction for building  Naiko because of growing rise.  The Hayazaki Naiko had changed to raise fields about 68ha in 1964.  The period had changed, rise has produced too much and there is a projection of changing.   We are trying to hear what happened around the Showa 30th period.  So that we are the volunteers to collect basic data 　　　　　　　　　　　　　　　　　　　　Hayazaki Naiko Networking Reder   Yoshihio Kurahashi