For the purpose of this chapter the following definitions shall apply unless the context indicates or requires a different meaning.
CHANNEL. Any arroyo, creek bed, stream, swale, ditch, bar ditch, diversion, or water course that conveys storm runoff, including man-made facilities.
CHANNEL STABILITY. A condition in which a channel neither degrades to the degree that structures, utilities, or private property are endangered, nor aggrades to the degree that flow capacity is significantly diminished as a result of 1 or more storm runoff events or moves laterally to the degree that adjacent properties are endangered.
CHANNEL TREATMENT MEASURE. The physical alteration of a channel for any purpose.
CIP. The City of Elephant Butte's Capital Improvement Plan.
CITY. The City of Elephant Butte, New Mexico.
CITY ENGINEER. The engineer or engineering firm designated or retained by the City of Elephant Butte to perform engineering services for the city.
COMPREHENSIVE PLAN. The City of Elephant Butte Comprehensive Plan and amendments thereto.
CONCEPTUAL GRADING AND DRAINAGE PLAN. A plan prepared in graphical format showing existing and proposed grading, drainage and erosion control information in sufficient detail to determine project feasibility.
DESIGN STORM. A storm which deposits a stated amount of precipitation within a stated period over a defined area and which is used in calculating storm runoff and in designing drainage control, flood control, and erosion control measures.
DEVELOPED LAND. Any lot or parcel of land occupied by any structure or improvement that is allowed by the zoning regulations for that property.
DOWNSTREAM CAPACITY. The ability of downstream major facilities to accept and safely convey runoff generated from contributing upstream areas.
DRAINAGE. Storm drainage.
DRAINAGE CONTROL. The treatment and/or management of surface runoff.
DRAINAGE PLAN. A detailed graphical plan including detailed grading plan information addressing on-site and off-site drainage and erosion control issues for lots or parcels each less than 5 acres.
DRAINAGE REPORT. A comprehensive analysis of the drainage and erosion control constraints on and impacts resulting from any proposed platting, development, or construction project.
EROSION CONTROL. Treatment measures for the prevention of damages due to soil movement and to deposition.
EROSION CONTROL PLAN. A plan for the mitigation of damages due to soil erosion and to deposition.
FIFTY-YEAR DESIGN STORM. That storm for a given watershed in which the precipitation as defined by the NOAA Atlas 2, Precipitation-Frequency Atlas of the Western United States, New Mexico, current volume has a 2% chance of being equaled or exceeded in any given year. The rainfall distribution shall be a 24 hour SCS TYPE 11-60 distribution such that the 1 hour rainfall is set at 60% of the 24-hour rainfall.
FULLY DEVELOPED WATER SHED. A hydrological condition in which all areas upstream and downstream of a point in question are assumed completely developed, including any undeveloped areas which are assumed to be developed in accordance with mid-range development densities as established by the Comprehensive Plan, appropriate area plans or sector plans, adopted by the facilities master plans and the hydraulic and hydrologic standards established by this subchapter.
GRADING PLAN. A plan describing the existing topography and proposed grading, including retaining wall locations and details, interfaces with adjacent properties, streets, alleys, and channels referenced to mean sea level, and showing sufficient contours, spot elevations, and cross sections to allow a clear understanding by reviewers, contractors, and inspectors.
MAINTENANCE. The cleaning, shaping, grading, repair, and minor replacement of drainage and erosion control facilities.
MAJOR ARROYO. Any channel whose watershed exceeds 160 acres whether the watershed is in its natural or unaltered state or has been altered by development, runoff diversion, or detention facilities.
MAJOR FACILITY. Any natural or man- made drainage facility, including a street or alley, which would collect, divert, or convey a peak discharge of more than 50-cubic feet per second (cfs) or store more than 2.0 acre feet of runoff in the event of a design storm.
MASTER PLANNED FACILITY. Any drainage control and or erosion control facility recommended in the Elephant Butte Comprehensive Plan or by the City of Elephant Butte Drainage Master Plan, amendments thereto, or any voter-approved, general obligation bond financed drainage control, and or erosion control facility.
MINOR FACILITY. Any facility which would collect, divert, or convey a peak discharge of 50-cubic feet per second (50 cfs) or less in the event of the 100-year design storm.
MULTIPLE USE FACILITY. A drainage and erosion control facility in which other secondary uses are planned or allowed, including but not limited to recreation, open space, transportation, and utility location.
NUISANCE WATERS. Those waters leaving a site and entering a public street which do not result from precipitation, such as landscaping, over watering, or car washing.
ONE HUNDRED YEAR (100) DESIGN STORM. That storm for a given watershed in which the precipitation as defined by the NOAA Atlas 2, Precipitation-Frequency Atlas of the Western United States, New Mexico, current volume has a 1% chance of being equaled or exceeded in any given year. The rainfall distribution shall be a 24-hour SOS TYPE 11-60 distribution such that the 1-hour rainfall is set at 60% of the 24-hour rainfall.
RED LOTS. A lot or lots designated by the City Council as drainage runoff or, erosion zones when they have been determined that drainage runoff or erosion conditions are present or there exists potential impacts to the property itself, adjacent or downstream properties based upon criteria established within Chapters 154 and 155. Such lots shall be identified on an official city list/map and be referred to as “Red Lots.”
TEMPORARY DRAINAGE FACILITY. A non-permanent drainage and erosion control facility constructed as part of a phased project to serve until the time that a permanent facility is in place, including but not limited to desiltation ponds, berms, diversions, channels, detention ponds, bank protection, and channel stabilization measures.
TEN-YEAR DESIGN STORM. That storm for a given watershed in which the precipitation as defined by the NOAA Atlas 2, Precipitation-Frequency Atlas of the Western United States, New Mexico, current volume has a 10% chance of being equaled or exceeded in any given year. The rainfall distribution shall be a 24-hour SOS TYPE 11-60 distribution such that the 1-hour rainfall is set at 60% of the 24-hour rainfall.
(Ord. 77, passed 1-5-2005; Am. Ord. 157, passed 8-5-2015; Am. Ord. 194, passed 12-16-2020)