Development of agricultural hydrology in Toyosawa river [Iwate, Japan] system: Counterplan for agricultural water supply's use and its conservation

abastecimiento de agua agricultura agriculture agua aflorada approvisionnement en eau bassin versant conservation de l'eau cours d'eau cursos de agua hidrologia histoire historia history hydrologie hydrology japan japon rendement en eau rivers uso del agua utilisation de l'eau water conservation water supply water use water yield watersheds