![]() In preparation for future developments at and around the airport, Morrison-Maierle also designed open channel structures to capture stormwater on the northeast side of the airport that directed the water to the detention ponds. ![]() After considering several methods, the team used a bentonite pond liner with a honeycomb, a three-dimensional structure made of plastic fabric, and filled with rocks and concrete, as an erosion control method. The team also spent time making careful decisions that would help control erosion, considering the amount of stormwater that would enter the detention ponds. The permitting and easement processes took significant time, as getting the pipe installation connections to Alkali Creek was difficult. This was the longest tunnel boring operation - at the 48-inch size - done by the contractor and their equipment. The design team found information on tunnel boring of the size and type of pipe needed, the procedure, the cost, and contractors who can do this work. Microtunneling was used at the airport in 1990, but after completing a cost analysis, the Morrison-Maierle team found that it was three times more expensive than tunnel boring. Phase 1 consisted of a new approach to installing a pipe under a runway. Phase 2 included installing underground piping from the airport’s north side to the Alkali Creek drainage and building large stormwater detention ponds near the existing Pond D structure.Īs a result, the Billings airport is now ready for storms of any kind with a system that can effectively move water from the airfield to a nearby creek. This also required the team to find a way to directionally drill a 30-inch pipe down a 130-foot sandstone cliff at a 30% slope. Phase 1 included two 48-inch tunnel bores installed under the main air carrier runway to alleviate mid-field ponding and water flowing over the runway during large storms. Billings-Logan International Airport hired Morrison-Maierle to come up with a solution that included a multi-phased project better to control the large stormwater events on the airfield, detain the large volume of water in a new pond structure, and drain the ponds through an underground pipe - at a predetermined rate - to nearby creek drainage.
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