Catch Basin-Physical: Surface Storage
Catch Basin-Surface Storage Attributes
| Attribute | Description |
|---|---|
| Surface Storage Type | Lets you choose how surface storage is handled. The value chosen here affects the availability of other fields: select Default Storage Equation , Surface Depth-Area Curve , No Storage , or Ponded Area .The Default Storage Equation uses the following formula: Area = 0.262 y - 0.068 y 2 + 0.006 y3 (y<4.0 ft) Area=0.344 (y>4.0 ft) where Y is the depth above the ground. In case of overflow/flooding: If No Storage is selected, the overflow elevation will be the rim elevation and there will be no storage at all. If a storage table is used then the highest h in the table will be the overflow crest elevation. If the default equation is used a depth of 2 ft over the rim is used. |
| Surface Depth-Area Curve | Lets you describe the volume of the surface storage by defining depth vs. area points. Click the Ellipsis (…) button in this field to open the Surface Depth-Area dialog box (see "Surface Depth-Area Curve Editor"-146). This field is available only when the Surface Storage Type attribute is set to Surface Depth-Area Curve . |
| Area (Constant Surface) | Lets you define the area in which ponding occurs at the currently selected element. It is available only when the Surface Storage Type attribute is set to Ponded Area . |