Model description of storage and infiltration functions of infiltration facilities for urban runoff analysis by a distributed model.
Although there have been simulation researches focusing on reduction of stormwater peak flow by introduced infiltration facilities, model simulation of dynamic runoff behavior is still limited for frequently occurring rainfall events with weak intensity. Therefore, dynamic simulation was carried out in two urban drainages with infiltration facilities incorporated with a distributed model using two methods for describing functions of infiltration facilities. A method adjusting effective rainfall model gave poor simulation of runoff behavior in light rainfalls. Another method considering dynamic change of storage capacity as well as infiltration rate gave satisfactory estimation of the runoff in both drainages. In addition, assumption of facility clogging improved the agreement between measured and simulated hydrographs in small and medium-sized rainfall. Therefore, the proposed method might be useful for quantifying the secondary effects of the infiltration facilities on groundwater recharge and urban non-point pollutant trapping as well as runoff reduction.
Furumai
H
H
Department of Urban Engineering, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan. furumai@env.t.u-tokyo.ac.jp
Jinadasa
H K P K
HK
Murakami
M
M
Nakajima
F
F
Aryal
R K
RK
D008962:Models, Theoretical; D011891:Rain; D015203:Reproducibility of Results; D012989:Soil Pollutants / Q000032:analysis; D014865:Waste Disposal, Fluid / Q000379:methods; D014872:Water Movements; D014873:Water Pollutants / Q000032:analysis
D012989:Soil Pollutants; D014873:Water Pollutants