Monday, June 08, 2009

Follow-up Public Comment on SNW

Brian;
Thank you for providing the link to the Hydrology Testimony. I found it very informative. And it directly answers some of the questions I posted earlier.

1. Is Evan Sayre correct about the technical implementation of the higher water level by using year-round planks on the dam?

No, he’s not. No mention is made of making adjustments to the spillway of the dam. It seems that the change in water level operating order would just affect the control position of the wicker and slide gates.

2. How much would the plan to increase water level would worsen floods when they happen?

Not a noticeable amount according to the testimony. Our lake is relatively small compared to its drainage area. High water events occur because of sustained high inflow to the lake. As we have seen in recent years the water level stays at or around the crest level for days or weeks. The ultimate height of the crest is a function of the sustained volume of inflow into the lake which is then matched by the outflow at Indianford as a function of water level. The starting lake level is not a significant factor in the equation.

The question about of the validity of the Fulton’s theory that the banks need time to dry after a flood isn’t directly addressed.
Ken