RV Park & Campground Drainage

Start with the park’s grades and existing drainage

Walk the property during and after rain. Mark ponded pads, eroding road shoulders, roof discharge, seepage, blocked culverts and water arriving from outside the park. Survey the collection points and proposed outlet elevations; record how high the receiving ditch, pond or storm sewer rises during storms. A deeper channel cannot create a gravity outlet below a flooded receiving system.

Separate local drainage problems from river, lake and flash flooding. Check mapped hazards, floodplain permits, emergency access and an evacuation plan with local officials. Keeping a bathhouse apron dry does not establish that occupied campsites are safe during a flood. FEMA’s floodplain guidance treats recreational vehicles and campground siting separately from ordinary surface drainage.

Build a whole-property plan, then phase it around risk, outlet capacity and planned resurfacing. Include buried electrical and water services, sewer laterals, wells, septic treatment and reserve areas, trees and protected waters before choosing excavation routes. See resort and hospitality drainage for other amenity areas.

Surface by surface: choose the collection method

Map stormwater, subsurface seepage and wastewater as separate systems. The appropriate solution may be regrading, a swale, a culvert, a point inlet, a channel or storage.

The sites themselves — gravel, paved and pull-through

Repair ruts, settlement and leaking hose bibs before adding drains. Maintain a pad profile that sheds water without sending it into the next campsite, across an accessible living area or toward a utility pedestal. On gravel, a stable swale or a properly supported catch basin outside wheel and landing-gear paths can be more practical than a channel. Control loose aggregate at the inlet and provide an accessible sediment collection point.

A channel can cross a gravel pad when it is installed in a designed concrete ribbon or other support detail specifically approved for that assembly and loading. Loose aggregate alone does not establish its traffic rating. On concrete patios, slope toward a low-edge channel or point drain where the layout warrants one; keep the accessible route usable. Coordinate slab joints, frost movement, outlet depth and surrounding pavement support. Driveway drainage covers similar pull-through geometry.

Loop roads and the entrance

Use crowns, roadside swales and culverts where grades and available width allow. A trench crossing can intercept runoff where a swale cannot, but it still needs a usable outlet. Evaluate capture and bypass on sloping approaches; a low-point inlet needs a safe overflow path if it blocks. Stabilize swales and culvert outlets for the design velocity so moving water does not undermine roads or carry gravel downstream.

Record loaded axle and wheel loads, tire contact, coach and fifth-wheel movements, delivery and refuse trucks, emergency apparatus, turning, braking and speed. Separately check concentrated fifth-wheel landing legs, leveling jacks and service-truck outriggers: a wheel-load rating does not establish support for these small contact areas. Locate them clear of drains or provide independently designed bearing areas. Gross vehicle weight divided equally among wheels is not a reliable design load.

Use the project’s adopted standard and the exact grate, frame, body, locks, foundation and pavement detail. EN 1433 classes and NDS letter classes are not interchangeable, and their test loads are not allowable vehicle weights. Confirm roadway or fire-access acceptance with the responsible designer and authority; a “Class C” label or metal grate alone does not approve a coach crossing. See the load recommendation guide.

Bathhouse exteriors: aprons, surrounds and door thresholds

Intercept roof leaders and uphill runoff before they reach entrances. Slope the apron away from doors within applicable accessibility limits; add a channel where sheet flow actually crosses it. A point inlet may suit a defined low spot. Keep inspection access out of door maneuvering space when possible.

On an accessible route, openings generally must not pass a sphere larger than 1/2 in.; elongated openings must have their long dimension perpendicular to the dominant travel direction. Also check changes in level, cross slope and a firm, stable, slip-resistant surface. Narrow openings alone do not establish compliance or barefoot comfort. See ADA Standards §§302–303 and 403. Federal outdoor facilities have additional, separately scoped ABA camping and RV pull-up provisions; do not apply those automatically as the nationwide private-campground rule.

Interior shower, restroom and laundry drainage is sanitary plumbing scope. Drainage Connect offers ACO sanitary stainless drainage and shower drains. Select the actual receptor, outlet, waterproofing connection, trap and vent arrangement under local plumbing requirements; an exterior channel is not an interchangeable shower drain. Coordinate detergents, disinfectants, water temperature and the compatibility of metal, seals and waterproofing with the manufacturer’s building drainage range.

Pavilion, camp store and pool deck

Route roof leaders through adequately sized solid pipe or a designed surface conveyance to an approved outlet. Provide accessible debris removal and protect foundations and soil at discharge. Check combined roof and paving flows before connecting several buildings to one existing pipe.

For pools, distinguish deck rainfall and splash collection from pool recirculation and suction outlets, backwash, draining and chemical handling. Each needs its own approved connection and operating plan. Choose accessible, barefoot-appropriate covers and compatible deck materials; preserve pool barriers and expansion-joint details. See pool deck drainage.

Tent loops, turf, dog runs and playgrounds

Identify whether the wet ground is caused by surface runoff, compacted soil, perched seepage or a seasonally high water table. Divert clean uphill runoff where appropriate and restore surface grades first. A conventional aggregate-and-perforated-pipe French drain, or NDS EZflow’s gravel-free subsurface system, may collect seepage where soil, filter selection, burial and outlet conditions suit it. Confirm the desired EZflow configuration and supply separately. A saturated receiving area is not made suitable for infiltration simply by burying a pipe.

Keep raised atrium grates out of paths, tent footprints and play fall zones. Coordinate drainage beneath playground surfacing with that surfacing system’s impact and accessibility requirements. Remove pet waste before cleaning; dog-run washwater needs a wastewater decision, not an automatic connection to a turf inlet. See yard and lawn drainage.

Dump stations, graywater and maintenance washwater

RV blackwater and graywater belong in the facility’s approved wastewater system. Lay out the dump receptor and spill/rinse collection so contaminated water stays within the sanitary collection area while surrounding clean runoff is diverted. Confirm sewer-utility acceptance or onsite-treatment capacity, peak tank-dumping flows, cleanouts, frost protection and protected rinse-water supply with the plumbing designer and health authority. For example, Minnesota’s campground requirements explicitly require approved sewage disposal; station counts and construction rules vary by jurisdiction.

A dedicated outside option is Enviro Design Products’ FootLoose FM104W sewer cap: the manufacturer specifies foot operation and a connection for a 4 in. Schedule 40 PVC standpipe. Hands-free cap operation is a useful function a storm grate does not provide. Verify the exact pipe fit, closure, local acceptance and location outside wheel paths; the cap is not a complete sanitary station, backflow device or vehicle-rated cover.

Capture RV washing, detergent-bearing apron cleaning and maintenance wastewater for an approved wastewater/reuse arrangement; do not route them to a storm inlet or dry well by default. EPA’s vehicle washing guidance addresses these pollutant sources. Drainage Connect offers ACO Oleopator and Spill Control options for appropriate oil-bearing streams. Select treatment from the oil form, solids, flow and cleaning chemistry: an oil-water separator does not treat sewage or reliably solve detergent-emulsified oil, and does not grant discharge permission.

How much water must the system handle?

Distinguish rainfall volume from runoff. As an illustrative upper-bound calculation assuming all rainfall becomes runoff, 1 in. over 1,000 sq ft is about 623 US gallons. Sixty hypothetical 12 ft × 40 ft pads total 28,800 sq ft, or about 17,950 gallons per inch; a mile of 20 ft wide road adds 105,600 sq ft, or about 65,830 gallons. These are contributing-area examples, not recommended campsite dimensions or measured campground runoff. Gravel response depends on fines, compaction, soil and prior wetness; it is not automatically impervious.

Use a design rate for collection and conveyance. One acre-inch per hour equals approximately 1.008 cfs or 453 gpm; 1 cfs itself is about 449 gpm. For a small catchment where the Rational Method is accepted, Q ≈ 1.008 C i A in cfs with i in inches/hour and A in acres. C represents runoff response; choose it and rainfall intensity for local conditions and the relevant time of concentration. A hypothetical 10-acre catchment at 2 in./hr and C = 0.8 gives about 16.1 cfs or 7,240 gpm. This assumes the selected storm duration allows the whole catchment to contribute; it does not predict a universal arrival time.

Check the entire flow path. Inlet capture, bypass, grate blockage, channel depth, outlet losses, pipe diameter and slope, receiving water level and downstream capacity all matter. Determine pipe grade hydraulically from actual inverts and available head rather than prescribing 1/8–1/4 in. per foot to every storm line. A nominal pipe size or per-foot grate intake figure is not an installed system capacity. Use the Runoff Calculator as a screening tool and the FHWA HEC-22 drainage design guidance for the design method.

Size storage by inflow and outflow over time. Detention and infiltration need a storm hydrograph, usable storage, controlled release or tested infiltration, drawdown and an overflow route. Peak flow alone cannot size a tank. Allow for sediment accumulation and blocked inlets without assuming an arbitrary percentage of capacity will remain after a fixed number of seasons.

Collection, storage and outlets: match each product to its job

Choose point or linear collection deliberately. Catch basins collect low spots and provide access for sediment removal. Select depth, sump, opening area, pipe connections and support for the actual flow and traffic. A larger basin does not automatically have a traffic-rated cover or more usable sump below the chosen outlet. A channel can connect directly to a designed pipe and cleanout arrangement; a basin is useful where access or sediment management requires one, not mandatory at every channel end.

Keep sediment accessible. Stabilize bare ground and gravel edges before relying on screens. A strainer catches debris only down to its openings; it is not fine-sediment treatment. Compatible basin filters or silt buckets need accessible removal and cleaning, and their head loss and overflow behavior must be included in design. Match each accessory to the basin, outlet elevation and frame; a bucket may conflict with a heavy-duty frame.

Use risers to maintain the designed rim elevation. Check the existing basin model, extension engagement, overall burial depth and load detail before raising it. Do not build up an inlet merely to match repeated gravel additions that send water toward neighboring sites. Outlet adapters, seals and fittings must match the actual pipe standard and diameter.

Surface discharge needs fall and space. Pop-up emitters can release suitable stormwater at grade when sufficient upstream head is available. Account for standing water, debris, freezing, mower damage and surface overflow. Keep discharge away from accessible paths, pads, neighboring property and erosion-prone slopes; protect wells and septic areas. An emitter is not a pump or a cure for high downstream water.

Infiltration requires suitable ground. Dry wells need field-tested infiltration, adequate separation from seasonal groundwater and bedrock, suitable runoff quality, setbacks and a designed overflow. EPA’s siting guidance covers soil, contamination, wells and septic fields. Some underground infiltration systems are Class V stormwater drainage wells with UIC obligations; verify the applicable authority before installation.

Consider storage and surface alternatives together. An accessible swale, bioretention area or detention basin can provide visible maintenance access where land allows. ACO StormBrixx is a catalog option for underground stormwater storage where surface space is constrained. Choose lined detention or infiltration according to the site; verify cover, burial, actual vehicle loads, groundwater uplift, pretreatment and inspection access. The StormBrixx maintenance manual explains why sediment prevention and access matter. Neither a tank nor a larger drain replaces a permitted outlet or suitable infiltration ground.

Permeable paving is another option. NDS Tufftrack TT-24 grass pavers can reinforce selected turf parking or access areas while retaining grass cover. The manufacturer identifies base design and soil drainage as key considerations. Compare them with conventional stabilized aggregate or engineered permeable pavement for the traffic pattern. Persistent RV shading, turning, turf wear and jack point loads need separate assessment; an advertised compressive strength does not establish a complete pad’s performance or accessibility.

Utility boxes are separate from drains. Service-marked valve boxes aid identification, but a WATER, SEWER or ELECTRICAL lid does not establish traffic capacity, sanitary sealing or electrical-enclosure approval. Keep ordinary landscape boxes out of vehicle and jack paths unless the exact assembly is approved for those loads.

Channel options by campground zone

Choose the complete assembly after confirming flow, support, traffic, maintenance and discharge. Confirm current configurations and supply before scheduling work.

Phase the work around risk and downstream capacity

Resolve the receiving system before adding upstream collection. Priorities depend on actual hazards and service failures; a pool deck or emergency access repair may need to precede cosmetic entrance work.

Send a loop-by-loop scope. Include a surveyed layout, drainage areas, existing rim and invert elevations, outlet/tailwater conditions, surface types, vehicle and jack loads, photographs, model numbers and proposed phases. Request quantities and pricing by phase, with availability, substitutions, quote validity and delivery dates confirmed before each purchase.

Choose spares from the maintenance plan. Record each cover, lock and tool type. Keep critical replacement parts where a missing cover would close an occupied route; quantities depend on asset count, damage history and confirmed lead time. Recheck compatibility when a manufacturer changes a frame or cover design.