The function of pipe drainage in the period of floods
1999
Fidler, J. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
Various procedures of drainage in flood runoffs were evaluated. Drainage runoffs are compared with calamitous runoffs in some water basins. Immediate response of surface runoff to hour sums of precipitation is evident from the pattern of runoff in Jesenjk with hour step while drainage runoff gradually grows without fluctuations and culminates belatedly following the last culmination of surface runoff. Circlets in graphs indicate theoretical drainage runoff depths which are however reduced on the actual runoff due to flooding of the pipe system after exceeding of maximum planned runoff unit-yield 1 l/s/ha, i.e. 8.64 mm/day. It is evident that drainage runoff may form only insignificant part of measured surface runoffs mostly fluctuating in fractions of percentage, exceptionally several per cent provided that surface and drainage culminating runoffs do not meet.
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