NORTON ENGINEERING | CAT-WOOD SITE PLAN

	Norton Engineering LLC "Engineering a Better World" (937) 223-5848
		Consultants in Dayton, Ohio

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Cat-Wood Metal Works:

Original Detention Basin - Dry

Original Detention Basin - Wet

Cross-Section Design of
Remodeled Detention Basin

This thriving business in West Carrollton needed to expand. It needed a larger building and more parking space on their small site, only about 1.1 acres of land. With the necessary expansions to the building and its parking lot, there was going to be more impervious surface than green space.

Since the client desired to expand at the original site instead of re-locating, Norton Engineering was asked to see what could be done on the existing site. With the clever application of some modern Stormwater management techniques, known as "BMP"s (for Best Management Practices), Norton came up with a unique plan that allowed the building, its expansion, and an additional parking lot to fit onto the existing property in an economical and permitable manner.

The lack of available space made it impossible to detain the required amount of Stormwater with a traditional detention basin expansion, so Norton used some other ideas: a filter drain and buried surge/leaching volume. The filter drain along the edge of the new parking lot slows down the Stormwater from the new impervious surface (and also cleans and filters the water before it gets to the detention basin). This filter drain technique also saves construction money by not having to use concrete curbs and catch basins in the new parking lot.

The surge/leaching volume was installed under a slightly enlarged dry retention basin. The finished detention basin appears to be only slightly larger than before, without steep slopes, but the basin was dug 4 feet deeper and filled with porous rock wrapped in filter cloth. It is this "rock bag" that yields the necessary extra Stormwater volume and leaching surface needed to handle the new Stormwater surges created by the additional new impervious roof and parking surfaces in the new development. A steel plate with a thin vertical slot replaced the existing round inlet in the detention pond's outlet structure because it controls the flow nicely, without clogging. (And should it ever get clog with a grocery bag, or such, it is easy to rake clean from the top.)