Management Criteria for Maintenance Plan

The City of Henderson has an overriding responsibility to residents and property tax payers across the City to protect public infrastructure, private property, and the health and safety of citizens and visitors. The Pittman Wash is dedicated as a public right-of-way with a primary use as a flood control and utility corridor. It is identified as a regional flood control facility and the conveyance capacity and efficiency as such may not be compromised. As a member agency, the City adheres to the guidance and minimum criteria provided in administrative documents, prepared through the Clark County Regional Flood Control District (CCRFCD) with the support and cooperation of each member agency, to maintain the effectiveness of the facility. The Pittman Wash also contains a large-diameter sanitary sewer that conveys wastewater from a majority of the residents and businesses in Henderson located between the I-215 Beltway and Warm Springs Road to the lowest elevation of the service area, which is the Pittman Wash. The City has prepared key management criteria for the following topics to guide the preparation of a proactive maintenance plan for the Pittman Wash:

Meet local, state, and federal regulatory requirements

• Floodplain regulations
  
  • No greater than a 1-foot rise in water surface elevation from existing to allowable vegetated condition
  • City pre-approval of any trail building, dog waste bag supply stations, benches, kiosks, etc.
• Storm water quality regulations
  
  • No pet waste receptacles
  • No trash receptacles
• Biological monitoring
  
  • Complete regularly scheduled work between October 1 and February 28
  • Hire qualified biologist prior to unscheduled work between March 1 and September 30

Provide for public health and safety

• Urban search and rescue
  
  • Provide and maintain permanent access road
  • Clear view of wash area from park trail
• Minimize fire hazards
  • 5-foot buffer from property walls, 30-foot buffer from structures; whichever is greater
  • Control density of vegetation in wash
• Maintain flood protection
  
  • Stabilize bed and bank erosion
  • Repair engineered channel lining between Pebble Road and Green Valley Parkway
  • Repair erosion damage in channel between Pebble Road and Arroyo Grande Boulevard
  • Provide and maintain access for inspection and repair
• Mosquito and rat-borne diseases
  
  • Follow Southern Nevada Health District guidance to prevent mosquito breeding and any other identified public health threats
  • Keep water flowing, eliminate ponding and backwater
  • Eliminate vegetation at storm drain outfalls
  • Eliminate invasive palm and cypress species

Protect public infrastructure to ensure efficient operation and meet expected life cycle

• Stabilize bed and bank erosion
• Create buffer from and control types of vegetation in proximity to infrastructure
  
  • No vegetation having a mature height of greater than 3-feet shall be placed within 5-feet (outside to outside) of the sanitary sewer pipes
  • Eliminate vegetation growth in the vehicle ingress or egress pathways to the access road
• Proactive infrastructure inspection, operation, and maintenance
  
  • Maintain facility in condition and manner specified in controlling
  • Provide and maintain permanent access road for inspection and maintenance
  • Prepare a maintenance guide specifically for unlined channel sections, such as portions of Pittman Wash.

Vegetation monitoring and control

• Eliminate woody vegetation from engineered linings
• Eliminate vegetation at storm drain outfalls
• Control height and density of vegetation within flow area