Study on rain runoff infiltration and collecting efficiency by permeable pavements of urban zone

This paper introduces briefly three hydrologic models commonly used inChina, discusses the mechanisms of evaporation, infiltration, and yield as well as concetration of runoff in these models, and invetigates into some problems encountered inapplications.

Modeling of nitrogen losses via runoff,vertical leach and lateral seepage from urea applied rice field;

A simple model based on the theory of 'first-order reaction' kinetics and water-nitrogen coupled balance was developed to quantify N losses from urea applied to a near-trench rice paddy field,considering all the N transformations such as urea hydrolysis,volatilization,nitrification,denitrification,and all the important transportations like runoff,lateral seepage,vertical leaching and crop uptake.

Design and management of floating bio-bed/subsurface infiltration system for campus sewage treatment;

Technical difficulties and solutions of subsurface infiltration system in domestic wastewater treatment

Based on the analysis of the technical characters of various land treatment systems,it was pointed out that constructed wetland and subsurface infiltration system had prominent ecological and cleaning functions in the treatment of domestic wastewater,which could be used to construct an ecological land treatment mod.

Two sets of subsurface infiltration system with red clay as media were built to make pilot test.

As a result of thetraditional subsurface infiltration system has some defects, such as, hydraulic loading islow, using ground-area is large, field condition is strict, climate affect and so on, theapplication of subsurface infiltration system is limited.