We also came up with some definitions of these chemicals. Neutral which is in the middle of being acidic or basic has a pH of 7. Pure water tends to be neutral with a pH of 7 or so. We predict that the creek should have a pH of just around 7. Nothing that we have read suggests that the pH of the creek should change with a change in the flow rate.
Nitrates are the salts of nitric acid.
Nearly all nitrates are soluable in water. Nitrates are alot like a fertilizer, All plants need nitrates to grow, therefore we think that there should be the same amount of nitrates in both sites because they both have about the same amount of plant life around them. Phosphates are products formed by the replacement of some or all of the hydrogen of a phosphoric acid by metals. Phosphates are important to metabolism in plants and animals. We believe that phosphates are needed just as much in the fast moving water as in the slow moving, so we think the amount will be the same in both spots.