As used in this chapter.
“Channel.” Means a natural or artificial watercourse, which continuously or periodically contains moving water or which forms a connecting link between two bodies of water. It has a definite bed and banks which confine the water. “Channel flow” means the water flowing within the limits of the defined channel.
“Detention/Retention Basin Manual.” Means the technical design manual prepared by the Engineer of the City of Broadview Heights.
“Developer.” Means any person who acts in his or her own behalf or as the agent of an owner of property and who engages in the alteration of land or vegetation in preparation for or in connection with construction activity.
“Development.” Means any alteration of land or vegetation in preparation for or in connection with construction activity.
“Drainageway.” Means a route or course along which water moves or may move to drain an area.
“Emergency flow way.” Means the flow routes and drainageway necessary to convey the 100-year storm through a development.
“Emergency spillway.” Means a spillway that must be included in all retention/detention basin designs, SCS Methods must be utilized in its design. Design frequency of 100 years must be used.
“Erosion control.” Refers to requirements documented in the Ohio Department of Natural Resources Division of Soil and Water Conservation “Urban Sediment Pollution Abatement Rules”.
“Fence.” Means an enclosure that is required around all storm water facilities as required by the Planning Commission.
“Flood.” Means the temporary inundation of any land not normally covered by water due to heavy rainfall or runoff or due to a temporary rise in the level of rivers, streams, watercourses, or lakes.
(1) “Average annual flood.” Means a flood equal to the mean of discharges of all the maximum annual floods during the period of record.
(2) “Regional flood.” Means the name applied to the 100-year flood in floodplain information reports. The 100-year flood has a 1% probability of being equaled or exceeded in a period of 100 years.
(3) “Maximum probable flood.” Means the largest flood discharge believed possible considering the meteorologic conditions and snow cover on the watershed.
“Floodway.” Means the channel of the watercourse and those portions of the adjoining floodplain which are used to convey the regional flood.
“Grassed waterway.” Means a broad and shallow natural course or constructed channel covered with erosion-resistant grasses or similar herbaceous cover and used to conduct surface water.
“Hydrologic and hydraulic study.” Means engineering study utilizing SCS TR 55, 1986 edition, to determine rates, volumes, and distribution of storm runoff, and its collection, storage, and conveyance.
“Runoff.” Means the portion of rainfall, melted snow or irrigation water that flows across the ground surface and eventually is returned to streams.
(1) “Accelerated runoff.” Means increased runoff due to less permeable surface area primarily caused by urbanization.
(2) “Peak rate of runoff.” Means the maximum rate of runoff for any storm.
(3) “Runoff volume.” Means the total quantity or volume of runoff during a specified time period. It may be expressed in acre-feet, in inches-depth of the drainage area, or in other units of volume.
“Storage.” Means the control, retention, or detention of runoff.
(1) “Detention storage.” Means storm runoff collected and stored for a short period of time and then released at a controlled rate. (Dry pond)
(2) “Retention storage.” Means storm runoff collected and stored for a short period of time and which is released at a controlled rate, leaving a minimum pool of water in the facility. This facility is often associated with water-related or aesthetic uses. (Wet pond)
“Storage facility.” Means any facility used to store, retain or detain storm runoff, which shall include, but not be limited to, retention and detention storage facilities, underground pipe, rooftop or parking lot storage, basins, depressions and pools.
“Storm drainage system.” Means the surface and subsurface system for the removal of water from the land, including both the natural elements of streams, gullies, ravines, marshes, swales and ponds, whether of an intermittent or continuous nature, and human-made elements which include conduits and appurtenant features, culverts, ditches, channels, storage facilities, streets, and the storm sewer system.
(1) “Initial drainage system.” Means that part of the storm drainage system which is used regularly for collecting, transporting, and disposing of storm runoff, snow melt, and miscellaneous minor flows. The initial system is also termed the “convenience system”, the “minor system”, or the “storm sewer system”, and may include many features ranging from curbs and gutters to storm sewer pipes and open drainageways.
(2) “Major drainage system.” Means that storm drainage system which carries the runoff from a storm having a frequency of occurrence of once in 100 years. The major system will function whether or not it has been planned and designed and whether or not improvements are situated wisely with respect to it. The major system is also termed the “emergency flow way”. The major system usually includes many features such as streets, ravines, and major drainage channels. Storm sewer systems may reduce the flow in many parts of the major system by storing and transporting water underground.
“Storm frequency.” Means the average period of time in which a storm of a given duration and intensity can be expected to be equaled or exceeded.
“Stream.” Means a course of running water usually flowing in a particular direction in a definite channel and discharging into some other stream or body of water.
“Watercourse.” Means a channel in which a flow of water occurs either continuously or intermittently in a definite direction. The term applies in either natural or artificially constructed channels.
(Ord. 1-91, passed 1-7-1991)