Bunney’s Inc. designs, builds, and rehabilitates rain spillways and stormwater conveyance features for municipal, industrial, and commercial sites across Arizona. From hydraulic review and permitting support to construction and long-term upkeep, we deliver resilient systems that move water safely, protect infrastructure, and meet regulatory requirements.
New to Bunney’s? Learn who we are and explore our capabilities and projects.
Why Owners Choose Bunney’s
-
Arizona-ready expertise: Methods tuned for monsoon events, desert soils, and flash-flood velocities.
-
Safety & compliance: Pre-task planning, SWPPP alignment, and clear QA/QC documentation. See our Safety program.
-
Self-perform delivery: Earthwork, Concrete Flatwork, riprap/gabions, culverts, and outlet structures for tighter control of cost and schedule.
-
Integrated sitework: Pair spillways with Erosion Control, Dust Control, and Trench Backfilling to stabilize disturbed areas.
-
Clean handoffs: As-builts, photo logs, and maintenance recommendations at closeout.
Rain Spillway Services
Rain spillways, also known as overflow spillways or rainwater spillways, are structures designed to divert excess rainwater away from properties, roads, and other vulnerable areas. They serve as essential components of stormwater management systems, preventing flooding, erosion, and water damage during heavy rainfall events.
Assessment & Planning
Hydraulic review of existing drainage, condition assessments (scour, undermining, headwall cracks), and constructability planning with the AHJ.
New Construction
Open channels, emergency spillways, culvert crossings (RCP/HDPE), energy-dissipation structures (riprap aprons, stilling basins, baffle blocks), and basin outlet works (weirs, orifice plates).
Rehabilitation & Repairs
Armoring of inlets/outlets, slope stabilization, headwall/wingwall repairs, erosion protection, debris management, and regrading for positive flow.
Channel Lining & Protection
Riprap, articulated concrete block mats, shotcrete, and vegetative stabilization integrated with Erosion Control BMPs.
Utilities & Excavation Support
Utility locates and daylighting with Hydro/Vacuum Excavation and Potholing Services to avoid strikes and delays.
The Importance of Rain Spillways:
- Preventing Flood Damage: Rain spillways help prevent flooding by diverting excess rainwater away from low-lying areas and structures, reducing the risk of property damage and water ingress.
- Erosion Control: By directing rainwater runoff to designated drainage channels or retention ponds, rain spillways help mitigate soil erosion and preserve the integrity of landscapes and infrastructure.
- Protecting Water Quality: Properly designed rain spillways incorporate filtration and sedimentation mechanisms to remove pollutants and contaminants from stormwater runoff, safeguarding local waterways and ecosystems.
- Enhancing Safety: Effective stormwater management, facilitated by rain spillways, reduces the likelihood of slippery surfaces, standing water hazards, and other safety risks associated with heavy rainfall.
How We Work
-
Plan: Review drainage reports/standards, confirm permit conditions, and set SWPPP and MOT (traffic) plans.
-
Prepare: Stake alignments, daylight utilities, and stage materials and BMPs.
-
Build: Excavate, form, and place structures; install culverts/armor; integrate outlet controls.
-
Stabilize: Final grading, armoring, and surface stabilization with seeding or long-term BMPs.
-
Verify & Closeout: Flow checks, punch list, and deliver as-builts, photo logs, and maintenance notes.
Key Considerations for Rain Spillway Installation:
- Hydraulic Design: Proper sizing and configuration of rain spillways are essential to accommodate anticipated rainfall intensity, flow rates, and drainage requirements.
- Location and Site Conditions: Strategic placement of rain spillways takes into account topography, soil characteristics, property boundaries, and existing infrastructure to optimize stormwater management outcomes.
- Maintenance Needs: Regular inspection and maintenance of rain spillways, including debris removal, vegetation management, and structural repairs, are critical to ensuring continued functionality and performance.
- Regulatory Compliance: Adherence to local regulations, building codes, and environmental standards is imperative when planning and installing rain spillways to avoid compliance issues and potential penalties.
FAQs
Do you handle permitting and inspections?
We coordinate with the authority having jurisdiction, align with SWPPP, and prepare documentation for inspections and acceptance.
Can you retrofit an existing spillway that scours during storms?
Yes—typical fixes include regrading, upgrading energy dissipation, armoring transitions, and repairing headwalls/wingwalls.
What materials do you recommend for long-term durability?
Riprap or articulated block at high-energy points, RCP/HDPE culverts as specified, and reinforced concrete at inlets/outlets.
Do you provide maintenance plans?
We deliver inspection intervals and tasks (debris removal, vegetation management, spot repairs) to preserve capacity and control erosion.
Other excavation services: utility trenches, berm work, spillway repairs, rain spillways, dust control, vacuum excavation, erosion control, duct bank, conduit excavation, hydro excavation, trench backfilling.
