P. Novak, Consultant In his paper the author has made a very useful contribution to the subject of prediction of oxygen content downstream of spillways, particularly in the case of surface aeration. However, some of the analysis referring to previously published results of oxygen uptake at hydraulic structures is not always rigorous enough. 40. The equations quoted for Avery and Novak apply to ...

Schistosomiasis is caused by several worm species of the genus Schistosoma and afflicts up to 600 million people in 74 tropical and sub-tropical countries in the developing world. Present disease control depends on treatment with the only available drug praziquantel. No vaccine exists despite the intense search for molecular candidates and adjuvant formulations over the last three decades. Cyst...

:omposition but to zero change at the ,eak. I would point out to Andrews that ialid conclusions cannot be drawn from -alculations which fail to take precipi.ation into account. The isotopic evidence demonstrates :hat there was a massive flood in the Gulf )f Mexico, peaking about 11,600 years igo. Since nature is self-consistent, I ;uggest that those who have commented n our report revisit their...

Dams and other flow control structures constitute obstacles to upstream downstream aquatic habitats, reducing life-cycle success even eliminating diadromous potamodromous fish species from river basins. Providing effective passage past hydroelectric dams is critical for restoring habitat connectivity sustaining populations of species. Surface water release over spillways in diverting turbines e...

Accurate prediction of the scour hole depth and dimensions downstream ski-jump spillways has been an important issue among hydraulic researchers for decades. In recent years, computing methods such as Artificial Neural Networks (ANNs), Adaptive Neuro-Fuzzy Inference Systems (ANFISs) Support Vector Regression (SVR) have shown a powerful performance in characteristics owing to their flexibility l...