160 



CONSERVATION OF GROUND WATER 



ments must not cause any material depletion in usable quan- 

 tity or availability for use, which would doubtless apply 

 especially to periods when all the stream How is needed to 

 satisfy established rights. It will be necessary to increase our 

 knowledge of the hydrology of the Arkansas watercourse in 

 Colorado substantially (particularly of the ground water) 

 if each future development is to meet these requirements. 



