3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

• • AO- i mow • • SECTION 7: OTHER PERMITS Additional Permits anticipated to complete the project are: • • R.16 Uniform Fire Code Requirements • • Land Use • • Grading • Building • • SECTION 8: PERMANENT STORMWATER CONTROL PLAN A. Off-Site Analysis: • Storm water from the site enters the west gutter of Broadway Avenue and flows south 181 feet to a catch • basin. A 20'pipe connects to a catch basin at the intersection of Broadway and 33rd. A 79 foot pipe to • the east connects to a catch basin at the east side of Broadway Ave. A 12"48'pipe at 9%directs the storm water to a catch basin in the south flowline of 33`d street. Another 12" pipe conveys the water 56' • to the east at 5.07%. A 152' 12" pipe at 6.39%conveys water east to the southwest quadrant of the • intersection of 33`d and McDougall Ave. A 43' 12" pipe at 2.14%slope directs water to a catch basin to • the south east. A 57' 12" pipe at 1.12%directs water to the north east and connects to a combined sanitary sewer storm manhole in the center of the intersection. A 12' 12"diameter pipe conveys water to • another catch basin in the intersection. An 18" pipe then directs flow 340'to the east. A 200'18" pipe 411 conveys water to the east to the centerline of Smith Avenue. A 16'+/-pipe carries water to the south • east,then water is conveyed south approximately 300'south in Smith Avenue. • B. Pre-Developed Hydrology • The Predeveloped Hydrology is based on the site condition in 1997 based on the 2001 aerial photography. 411 See Existing Storm Basin Map and Existing Storm 1997.An aerial photo,Appendix B,and Public records • were also used to determine a history of the property and establish a timeline. The following is an explanation of the 1997 site conditions: • • The northern lots, 31 and 32 at the time of analysis had an asphalt parking area covering the entire two • lots. The surface slopes to the east. • • Lot 30 contained a wood frame house built in 1894. • Lots 27-29 contain a 2 story concrete building built in 1930. At the time there was a parking area in the • west with a small garage. • • Lots 24-26 had a two story wood-frame single family house built in 1910. • • Lots 22-23 have an apartment complex. • C. Developed Hydrology • The site will be developed with an apartment building that will cover the entire property. Stormwater will be collected and conveyed to an underground detention vault on site and released into the manhole • located in 32"d St.and Broadway Ave. See Section 3 of this report for more information. • D. Stormwater Flow Control Plan • Stormwater will be picked up on the roof and deck areas and conveyed to the detention vault. The • detention vault is in the bottom floor of the building in the parking garage. The discharge of the system • will gravity flow into the combined stormwater and sewer system in Broadway Avenue. • See Appendix 4 for MGS Flood design calculations for storage structures and flow control structures. • 49 • Broadway Apartments 8of 9 Stormwater Site Plan • • 4111