HomeMy WebLinkAboutSTORM WATER - 16-00280 - The Cottages Bldg 3Storm Water Retention,
The Cottages, Rexburg, ID
Given
Storm Intensity (in/hr)
0.9
Percolation rate (in/hr)
2.0
Dome System Volume per unit (ftA3)
88.4
Piping Length (ft)
0.0
Piping Diameter (in)
6.0
Dome Trench Length (ft)
8.0
Dome Trench Width (ft)
6.0
Dome Trench Height (ft)
4.5
Trench surface area
174.0
Area 1
Description
Roof area (ftA2)
Calculated 1 -hr volume (ftA3)
Retention area (ftA2)
Calculated average depression depth (in)
Area 2
Description
Roof area (ftA2)
Calculated 1 -hr volume (ftA3)
Retention area (ftA2)
Calculated average depression depth (in)
Area 3
Description
Roof area (ftA2)
Paved Area
Calculated 1 -hr volume (ftA3)
Retention area (ftA2)
Calculated average depression depth (in)
1/2 of roof area of Building C
To be retained in grassy area adjacent to Bldg. C
3927.0
294.5
795.0
4.4
1/2 of roof area of Building A
To be retained in grassy area adjacent to Bldg. A
3927.0
294.5
795.0
4.4
All of Building B roof, 1/2 of bldg's A,C and All Parking Lots
To be retained in landscaping in center of entry area
15708.0
11038.0
2006.0
1170.0
20.6
Design Summary:
Landscaped areas to the north of buildings C and A are to have an average elevation of minus 4.5" below
adjacent curb elevation, These areas are to retain storm water from the back -side of the roofs of
buildings A and C. Downspouts from those roofs are to drain into a collection pipe and discharged
into the retention areas.
The landscaped are in the center of the entrance is to have an average elevation of minus 20.6" below
the adjacent curb elevation. This area is to retain storm water from all of building B roof, 1/2 of buildings
A & C roofs and the pavement areas. Storm water is to be collected in catch basins and discharged
into the retention area or drained directly from the pavement to the retention area.