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tit PROGRESSION IN IMPROVED INLET DESIGN Authors: Kevin Gingery & David Thaemert 1999 CASFM Conference, September 22-24,1999 ABSTRACT College Hills (Stratford Lakes) South Basin Improved Inlet Under King Street The goal of this project in 1987 was to pass the 500-year storm event discharge from Pond 3, downstream beneath King Street, and into Pond 4. Improved inlet technologies were utilized by designing and constructing a 7' x 7' to 60" diameter reinforced concrete pipe eccentric reducer (and 60" diameter outfall pipe) and tying it into the side and slope tapered spillway from Pond 3. A 3:1 slope on the overflow spillway tied into the invert of the eccentric reducer whose slope was 2.68%. Looking back on this project 12 years later, one realizes that an entrance loss and a trash rack loss should have been accounted for during design. In addition, the trash rack should have been placed on a slope, not vertical. The improved inlet design calculations are included herein for your information. Ryan Gulch Improved Inlet Under Taft Avenue . The goal of this 1996 project was to pass the 1 DO-year storm event flow within Ryan Gulch beneath Loveland's Taft Avenue. Improved inlet concepts were used to design and construct a 6' x 6' to 48" diameter reinforced concrete pipe eccentric reducer (and 48" diameter outfall pipe). Performance of the improved inlet was analyzed using the Federal Highway Administration's HYB software. A precast flared end section flip bucket was also utilized to dissipate energy at the culvert outlet. Looking back on this project 3 years later, one realizes that the precast eccentric reducer should have been more carefully detailed to maximize the smooth improved inlet transition. The improved inlet and outlet flip bucket design calculations are included herein for your information. Blakeland Industrial Park Marcy Gulch Improved Inlet Under Blakeland Drive . The goal of this project in 1990 was to pass the 1 OO-year storm event flow in Marcy Gulch beneath Blakeland Drive. Improved inlet technologies were utilized by designing and constructing dual 9' x 5' reinforced concrete box culverts and tying them into the side and slope tapered transition from Marcy Gulch above. A curvilinear floor slab was utilized for the improved inlet. The dual box culverts were designed to be cast in place, but the 48- hour construction window caused them to be precast. Looking back on this project 9 years later, one realizes that a precast box culvert joint loss should have been accounted for during design in anticipation that this situation could arise. The improved inlet design calculations are included herein for your information. Seepage flow path and steel sheet piling cutoff wall calculations were not located and therefore are not included herein.