最小坡长
minimal longitudinal grade length
坡长限制
Slope length limitation
limitation of slope length
Grade length limit
Grade length limitation
最小纵坡长
minimal longitudinal grade length
合理坡长
reasonable vertical slope length
集流坡长
slope length for collecting stream
平均山坡长
average hill-slope length
源-汇流系
diverging-converging flow system