Volume 2-05, Chapter 3 - City of Wichita
Volume 2-05, Chapter 3 - City of Wichita Volume 2-05, Chapter 3 - City of Wichita
Section 3.2.1 - Stomwater Pond Step 7 Step 8 Step 9 Determine elevation and orifice size for channel protection extended detention: Wet Pond: The CP V orifice is placed at the top of the permanent WQ V pool. The preferred method is to route the 1-year, 24-hour inflow hydrograph through the pond, and select an orifice size that provides 24 hours of detention between the centroid of the inflow hydrograph and the centroid of the outflow hydrograph. In lieu of the routing method, a “simplified method” is available for determining the CP V and for configuring the CP V orifice. This method is described in detail in Chapter 4. In summary, the method consists of estimating the peak inflow and outflow to and from the pond for a 24-hour detention time, the CP V , and the corresponding maximum head on the orifice. This information is then used to size the orifice. Wet Extended Detention Pond and Wet Extended Detention Micropool Pond: For wet extended detention ponds, the CP V orifice is typically located at the top of the permanent part of the WQ V pool. As with the wet pond, the preferred method is to route the 1-year, 24-hour inflow hydrograph through the pond, and select the orifice size that provides 24 hours of detention between the centroids of the inflow and outflow hydrographs. However, in some cases, the simplified method discussed above may be used. The simplified method is strictly applicable to the situation where the active pool (in this case the CP V pool and the extended detention portion of the WQ V pool) is controlled by one or more orifices at the same elevation. However, it is rare that the WQ V orifice alone can serve to regulate both the WQ V and CP V . In most cases, a CP V orifice is also required. If the elevations of the centers of the WQ V and CP V orifices are “approximately” the same, then the simplified method is applicable. Until further information is available, the elevations of the centers of the orifices will be considered “approximately” the same if the difference between the center elevations does not exceed 20% of the CP V depth. Prepare hydrology analysis for floods and design embankment(s) and spillway(s): Size additional control structure orifices, weirs and emergency spillway as required for flood control and freeboard. Provide safe passage for the 100-year event. Investigate potential pond hazard classification: The design and construction of stormwater management ponds are required to follow the latest version of the Kansas dam safety guidelines, where applicable. Step 10 Design inlets, sediment pre-treatment facilities, outlet structures, maintenance access, and safety features: See Volume 2, Chapter 5 for more details. Page 3 - 40 Volume 2, Technical Guidance
Section 3.2.1 - Stormwater Pond Step 11 Prepare Vegetation and Landscaping Plan: A landscaping plan for a stormwater pond and its buffer should be prepared to indicate how aquatic and terrestrial areas will be stabilized and established with vegetation. 3.2.1.7 Inspection and Maintenance Requirements Regular inspection and maintenance is critical to the effective operation of stormwater management facilities. An operation and maintenance plan is required and shall include: 1. “Covenants for Permanent Maintenance of Stormwater Management Facilities” (also called the “Maintenance Covenants”). 2. “Inspection Checklist and Maintenance Guidance” for each type of stormwater facility that is located on the property. Templates for each stormwater management facility can be found in Volume 3 of this manual. These templates can be amended slightly for use in more customized O&M plans. 3. As-built drawings must accurately identify the location and layout of the pond, and also clearly identify drainage and access easements. All stormwater management facilities must be maintained in accordance with the O&M Plan. Volume 2, Technical Guidance Page 3 - 41
- Page 1 and 2: CHAPTER 3 STORMWATER CONTROLS TABLE
- Page 3 and 4: Chapter 3 - Table of Contents 3.2.8
- Page 5 and 6: Chapter 3 - Table of Contents LIST
- Page 7 and 8: Section 3.1 - Stormwater Management
- Page 9 and 10: Section 3.1 - Stormwater Management
- Page 11 and 12: Section 3.1 - Stormwater Management
- Page 13 and 14: Section 3.1 - Stormwater Management
- Page 15 and 16: Section 3.1 - Stormwater Management
- Page 17 and 18: Section 3.1 - Stormwater Management
- Page 19 and 20: Section 3.1 - Stormwater Management
- Page 21 and 22: Section 3.1 - Stormwater Management
- Page 23 and 24: Section 3.1 - Stormwater Management
- Page 25 and 26: Section 3.1 - Stormwater Management
- Page 27 and 28: Section 3.1 - Stormwater Management
- Page 29 and 30: Section 3.1 - Stormwater Management
- Page 31 and 32: Section 3.2.1 - Stormwater Pond 3.2
- Page 33 and 34: Section 3.2.1 - Stormwater Pond Fig
- Page 35 and 36: Section 3.2.1 - Stormwater Pond For
- Page 37 and 38: Section 3.2.1 - Stormwater Pond •
- Page 39 and 40: Section 3.2.1 - Stormwater Pond 1'
- Page 41 and 42: Section 3.2.1 - Stormwater Pond •
- Page 43 and 44: Section 3.2.1 - Stormwater Pond •
- Page 45: Section 3.2.1 - Stormwater Pond 3.2
- Page 49 and 50: Section 3.2.1 - Stormwater Pond Fig
- Page 51 and 52: Section 3.2.1 - Stormwater Pond Fig
- Page 53 and 54: Section 3.2.2 - Extended Dry Detent
- Page 55 and 56: Section 3.2.2 - Extended Dry Detent
- Page 57 and 58: Section 3.2.2 - Extended Dry Detent
- Page 59 and 60: Section 3.2.3 - Vegetative Filter S
- Page 61 and 62: Section 3.2.3 - Vegetative Filter S
- Page 63 and 64: Section 3.2.3 - Vegetative Filter S
- Page 65 and 66: Section 3.2.3 - Vegetative Filter S
- Page 67 and 68: Section 3.2.4 - Grassed Channel 3.2
- Page 69 and 70: Section 3.2.4 - Grassed Channel 3.2
- Page 71 and 72: Section 3.2.4 - Grassed Channel 3.2
- Page 73 and 74: Section 3.2.4 - Grassed Channel max
- Page 75 and 76: Section 3.2.5 - Enhanced Swale 3.2.
- Page 77 and 78: Section 3.2.5 - Enhanced Swale Chan
- Page 79 and 80: Section 3.2.5 - Enhanced Swale B. G
- Page 81 and 82: Section 3.2.5 - Enhanced Swale High
- Page 83 and 84: Section 3.2.5 - Enhanced Swale Side
- Page 85 and 86: Section 3.2.5 - Enhanced Swale 3.2.
- Page 87 and 88: Section 3.2.6 - Infiltration Trench
- Page 89 and 90: Section 3.2.6 - Infiltration Trench
- Page 91 and 92: Section 3.2.6 - Infiltration Trench
- Page 93 and 94: Section 3.2.6 - Infiltration Trench
- Page 95 and 96: Section 3.2.6 - Infiltration Trench
Section 3.2.1 - Stormwater Pond<br />
Step 11 Prepare Vegetation and Landscaping Plan:<br />
A landscaping plan for a stormwater pond and its buffer should be prepared to<br />
indicate how aquatic and terrestrial areas will be stabilized and established with<br />
vegetation.<br />
3.2.1.7 Inspection and Maintenance Requirements<br />
Regular inspection and maintenance is critical to the effective operation <strong>of</strong> stormwater<br />
management facilities. An operation and maintenance plan is required and shall include:<br />
1. “Covenants for Permanent Maintenance <strong>of</strong> Stormwater Management Facilities” (also<br />
called the “Maintenance Covenants”).<br />
2. “Inspection Checklist and Maintenance Guidance” for each type <strong>of</strong> stormwater facility that<br />
is located on the property. Templates for each stormwater management facility can be<br />
found in <strong>Volume</strong> 3 <strong>of</strong> this manual. These templates can be amended slightly for use in<br />
more customized O&M plans.<br />
3. As-built drawings must accurately identify the location and layout <strong>of</strong> the pond, and also<br />
clearly identify drainage and access easements.<br />
All stormwater management facilities must be maintained in accordance with the O&M Plan.<br />
<strong>Volume</strong> 2, Technical Guidance Page 3 - 41
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