Suburban sprawl and poor preparation worsened flood damage in Louisiana

After the 1983 flood, local officials began taking steps to improve flood protection systems and reduce risk. They included raising and modifying highway bridges that impeded the flow of river water, and upgrading levees and pumps to manage excess backwater flooding in the lower reaches of the river basins.

Baton Rouge, the state capital and largest city in the region, and Denham Springs modified their floodplain building standards to reduce risk. And public officials secured authorization in 1986 for the Corps of Engineers to build a diversion canal to redirect excess water from the upper Comite River basin to the Mississippi. Local voters even approved a tax to fund a portion of the project in 2000. By all appearances, it seemed that communities were responding to Emmer’s appeal.

Growth pressures in flood-prone basins
However, these efforts have not been sustained. Suburban sprawl has spilled onto floodplains and placed residents at risk.

For example, the relatively new incorporated community of Central in East Baton Rouge Parish reports that 75 percent of its territory is in the 100-year floodplain. According to initial news reports, up to 90 percent of the town’s houses sustained damage in this month’s floods.

Between 2000 and 2010, the population of Ascension Parish grew from 76,617 to 107,215, and Livingston Parish’s population increased from 91,814 to 128,026. Developers have intensively built up areas along the Comite and Amite rivers and in the territory where the two rivers converge and back up into Bayou Manchac during floods. Meanwhile, the Comite River Diversion Canal has received irregular and inadequate funding and is years from entering operation.

Many properties that sustained damage this month lie outside of the 100-year floodplain in developments approved by local agencies. There has been no effort to deflect development or require safe construction practices within the 500-year floodplain, even though the region’s flood history suggests that broader flood mitigation efforts would be prudent.

A false sense of security
Since Congress passed the Disaster Relief Act of 1950, the federal government has provided relief and recovery funds after large-scale floods and other disasters. These payments, along with federally funded levees and other flood control structures, have created a false sense of security in the face of risk.

For centuries before the National Flood Insurance Program was created in 1968, Louisiana residents who lived in flood-prone areas took steps to reduce their personal risk. Native Americans built their mounds and communities on terraces above flood-prone rivers. During colonial times, people built houses in floodplains with living quarters five to eight feet above ground level. Spanish soldiers assigned to the much-detested military garrison on Bayou Manchac abandoned it due to its tendency to flood soon after Spain ceded its Florida territory to Britain in 1763. Most of them moved to higher ground in Baton Rouge.

After Louisiana joined the United States, residents continued to build houses along rivers or near the coast on stilts. In the 19th century, coastal dwellers began gradually retreating inland. And many residents in flood zones maintained modest dwellings and furnishings, which minimized replacement costs after high-water events. Tied to local livelihoods and intent on remaining in place, they made deliberate decisions to live with risk and built homes accordingly.

Recently, however, suburban sprawl has spurred enactment of building codes that mandate building techniques using concrete slab foundations set directly into the ground. And increasing affluence has enabled families to purchase larger dwellings in areas of high and moderate flood risk. Under the National Flood Insurance Program, buyers must obtain federal flood insurance to qualify for mortgages in 100-year flood zones, but some properties near flood zones do not face the same requirement.

Consequently, many families purchased homes in areas of relatively low risk without flood insurance. Others allowed their insurance to lapse. Surrounded by new developments, many newcomers likely never realized they were anywhere near flood-prone rivers.

Disasters tend to spark short-lived interest in learning lessons from tragedy. Perhaps local officials can parlay the obvious lesson of inadequate follow-through on the Comite diversion canal into new funding. More importantly, the Federal Emergency Management Agency should factor this month’s floods into the flood zone maps, so that this extreme event becomes part of the baseline for delimiting risky areas. And state or local officialsmight consider expanding the territories eligible for insurance to the 500-year floodplain.

If there is one lesson we have learned about floods, it is that records are made to be broken. So in addition to planning for the last flood, we need to anticipate higher water than our current benchmarks.

Craig E. Colten is Carl O. Sauer Professor of Geography, Louisiana State University. This article is published courtesy of The Conversation (under Creative Commons-Attribution / No derivative).