Slope & Channel Erosion Control in Indianapolis, IN

Slope and channel erosion control in Indianapolis is less about mountainsides and more about the places water concentrates: the back slope of a detention pond, the swale between two houses, a roadside ditch, a creek bank in a backyard, or the cut bank behind a new walkout basement. The city's till plain is mostly flat, but the White River and its roughly 35 tributary streams, among them Eagle Creek, Fall Creek, Pleasant Run and Pogue's Run, have cut valleys and ravines, and every development adds new grades. When a thunderstorm drops an inch of rain in an hour, all of that water heads for the low line, and bare soil goes with it.

Matching the material to the problem

Gentle slopes with sheet flow can often be held with a heavy hydromulch application and a strong tackifier. Steeper slopes, generally anything you would hesitate to mow, need more: a bonded fiber matrix, which sprays on and dries into a continuous, porous mat, or a rolled erosion control blanket stapled to the ground. In swales and ditches where water runs in a channel, blankets are usually the right answer, because sprayed mulch can lift once flow gets moving. Straw blankets break down over a season or two as the grass takes over. Straw and coconut blends and pure coir last longer for channels and steeper ground.

Why our soils need help

The silty surface soils over glacial till that dominate central Indiana are productive farmland, but silt is among the easiest soil particles for water to pick up and carry. The dense till underneath lets water through slowly, so on a slope the surface layer saturates and runoff starts sooner than it would on sandy ground. Spring is the hardest season: May is typically the wettest month, March and April bring big temperature swings, and new seed is slow to establish in cool soil. Slope stabilization that holds through one spring usually holds for good once the grass roots in. That is why we prefer to finish slope work in late summer or early fall, giving roots a full fall and the following spring to grow before the next round of heavy storms.

Seed is the long-term fix

Blankets and mulch are temporary. What holds a slope for decades is a dense stand of grass with deep roots. We seed under every blanket and into every hydromulch application, choosing mixes for the site: turf-type grasses where the slope will be mowed, lower-growing or native-leaning mixes on banks that will be left alone. On creek banks and pond edges we pick species that tolerate both wet feet and dry spells.

Permitted sites and backyard problems

On construction sites the stormwater pollution prevention plan usually specifies blanket types and locations, and we install to it. Indiana's Construction Stormwater General Permit is aimed squarely at sediment, so the slopes and channels on a permitted site get inspected. Homeowners call us for different reasons: a backyard bank that drops a little more soil into the creek every storm, a swale that has cut a gully down to clay, or a hillside the builder seeded once and never came back to. The fix is the same idea at a smaller scale. We reshape the damaged area, add soil where it has been lost, seed it, and cover it with the right blanket or mulch.

Installing blankets correctly

Most blanket failures come from installation, not the product. The top edge has to be buried in a trench, the rolls run downslope on slopes and with the flow in channels, overlaps shingled so water rides over the seams, and staples set closely enough that the blanket stays in full contact with the soil. If water gets under a blanket, it tunnels and the slope fails anyway. We staple to the manufacturer's pattern and check channel installations after the first big rain. Where a blanket ends at a pipe outlet or a road culvert, we add extra staples and an anchor trench, since those transitions are where water hits hardest.

Signs a slope needs attention

Small rills running downhill after a storm, a fan of silt at the bottom of a bank, grass that never fills in on one face, exposed roots along a creek edge, or a swale cutting deeper each year all mean water is winning. Catching them early is cheaper: a reseeded and blanketed slope costs far less than rebuilding one after a gully has formed. If you are not sure whether a problem is serious, send us photos after the next rain and we will tell you what we think before scheduling a visit.

Erosion control services we offer

We handle residential slopes and swales, builder and commercial basins, ditches and right-of-way, and creek and pond banks. If your site also needs sediment controls at the bottom of the slope, our silt fence crew handles that as part of the same job. Get a free estimate