 इयं हैमवती गङ्गा ज्येष्ठा हिमवतस्सुता।तां वै धारयितुं शक्तो हरस्तत्र नियुज्यताम्।। 
  This Hymavati Ganga is Himavats eldest daughter and only lord Siva is capable to hold the force of her descent to earth. Therefore let Siva be entreated. 