I think it is because beneath the top soil the bed rock is a very white limestone. I went by where they were doing some ground work and the bedrock is pure white. I wanted to take some photos but the overcast sky wouldn't do the whiteness of the stone justice. These SE England spring creeks (chalkstreams) are very near the famed white cliffs of Dover.
>From what I understand, as the ground water filters through the limestone it gives the water a bit of base making it very fertile for aquatic life. Also since the water filters up through the ground, it flows at a very constant temperature. The spring creeks of Pennsylvania, originate in limestone as well, I believe. Yellowtail Reservoir, which provides the tailwater the lower Bighorn River, also has limestone walls and bottom. As the water sits in the reservoir it gets a bit basic. Since the water is released from the base of the reservoir, the water temperature stays cool and temperature fluctuates are low. Rocky Ford is a spring creek as well, but not of limestone origin. Mike -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Uncle Brad and Elly Sent: Saturday, September 20, 2003 4:06 PM To: [EMAIL PROTECTED] Subject: Re: British Chalkstream Fishing Report michael, why are they called chalkstreams ?
