Introduction
Since 2011, one experimental watershed in UTCBF, UTHF, UTCF, ERI and ARI has been operated as Category I. The water level of the stilling pool of the weir is continuously measured for runoff calculations. Rainwater and stream water samples are collected monthly on a certain date of a month and shipped to designated laboratories. For stream water samples, acidity (pH), electrical conductivity (EC), and seven ion concentrations (Na+, K+, Mg2+, Ca2+, NH4+, Cl-, NO3- and SO42-) are analyzed. For rainwater samples, pH, EC, and the seven ions plus NH4+ concentrations are analyzed. Daily precipitation, runoff, and monthly water quality data have been published annually as data papers in the UTF journal, under "Miscellaneous Information, The University of Tokyo Forests" and this website.

Experimental watersheds other than Category I are ranked as Category II, and are maintained by each regional forest. However, daily rainfall and runoff, and monthly rainwater and stream water quality can be published together with the Category I data if each regional forest transfers the calculated products from the Category II data to ERI.

How to Use
Use of data is limited to research and educational purposes only.We refuse to use it for other uses.When using these data, you must cite all data papers corresponding to those data.
Contact us
Hydrology and Water Quality Division, Fundamental Data Development Committee,
The University of Tokyo Forests
Graduate School of Agricultural and Life Sciences,The University of Tokyo
1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657 JAPAN
E-mail: kishou-suimon_rep「at sign」uf.a.u-tokyo.ac.jp

Observation Equipment
Year
2003-2011 (exclude UTHF Hydrological data and Rainwater Quality data)
2008-2011 (UTHF Hydrological data only)
2011 (Rainwater Quality data only)
　　　  2012 2013 2014
2015  2016 2017 2018 2019
 2020 2021  2022    

◆Hydrological data
Local UTFs Station Name (Precipitation) Station Name (Runoff)　 Year
UTCBF Shinta FukuroyamasawaA  　2003-2019　
FukuroyamasawaB  　2008-2019　
FukuroyamasawaC  2008-2019
UTHF Togo Dam Maruyamazawa  　2004-2019　
UTCF Tobakuzawa Tobakuzawa  　2003-2011　
Wasabizawa Bakemonozawa  　2011-2019　
ERI Shirasaka Shirasaka Hontani 1930-2002
(ERI Website)  
2003-2019
ARI Aono 1gosawa  　2003-2014　
2gosawa  　2003-2019　
3gosawa  　2003-2019　

◆Rainwater quality data
Local UTFs Station Name Year
UTCBF Shinta  　2011-2018　
UTHF TogoDam  　2011-2019　
UTCF　 Wasabizawa  　2011-2019　
ERI Shirasaka 　 2018-2019　
ARI Kano  　2011-2019　

◆Stream water quality data
Local UTFs Station Name Year
UTCBF FukuroyamasawaA 2003-2019
FukuroyamasawaB 2003-2019
UTHF Maruyamazawa 2003-2019
UTCF Tobakuzawa 2003-2011
Bakemonozawa 2011-2019
ERI ShirasakaMinamitani　 2003-2010
Shirasaka Hontani　 2011-2019
ARI 1gosawa 2003-2014
2gosawa 2003-2019
3gosawa 2003-2019