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600 Block Grand Street 20 600 Block Bonham Street 100 500 Block Lamar Street 25 500 Block Clarksville Street 34 I was hoping that I could report to you that most of the improvements in drainage would only represent a small percentage of the overall drainage area. However, as can be seen above, that is not the case in any of the locations. Even though 24' and Lamar has the smallest percentage increase, it shows that nearly one fifth of the entire drainage basin above that point is more efficiently emptying into the storm sewer system. The 600 Block of Bonham is the worst case condition, practically all of the drainage system winds up flowing overland to the curb and down to the inlet boxes at the low point in the drainage area. Improving the inlets in this area might reduce the flooding experienced by Welch's Art Gallery, but it would probably just move the flooding further downstream. (This last statement assumes'that the existing brick storm sewer has excess capacity now to accept the additional load imposed on it by the proposed curb inlets. Should the existing storm sewer not have this capacity then no amount of inlet boxes will be able to push any more water into it than it is able to carry.) It appears that if we were to install the proposed curb inlet boxes and grates that we would simply add to the amount of water flowing in the storm sewer collection system downstream of that point, assuming that the extra flow capacity was even available. Adding to that flow will surely add to the flooding problems downstream. I wish I could report better news to you, but I guess we both suspected it anyway. At least now we have an idea of what we are up against. I will await your further instructions. Please give me a call if you have any questions. Sincerely, HAYTER ENGINEERING i9i9CI Michael N. Tibbets, P.E. a2 D Project Manager MNT:mnt C: WyFileslparislDrainage ProjectlTeny Townsend Janauary 2, 2001.wpd OF CV �i1YSi".S9CpCfjli� ��: I iii. 1BBE:;