The cost of building a home in Houston – or adding to an existing residential property – figures to soon increase.
The City of Houston plans to require increased stormwater detention capacity for single-family residential lots with more than 65 percent impervious cover, effective March 31, according to documents drafted by Houston Public Works and department director Carol Haddock.
Part of the upcoming changes to the city’s Infrastructure Design Manual (IDM), the min lot size subject to stricter detention standards is also will be reduced by half.
Schroeder said the planned changes to Chapter 9 of the Infrastructure Design Manual (IDM), which covers stormwater design and water quality requirements, aim to reduce flooding risks and are in response to a 2020 interlocal agreement with Harris County.
The city’s plan, per the IDM supplement dated Jan. 4 and signed by Haddock, calls for a base detention rate of .75 acre feet per acre for lots that are at least 7,500 square feet or have impervious area in excess of 65 percent of the lot.
Such a detention rate means that for every 1,000 square feet of impervious cover, which would be structures such as a house, swimming pool, patio or slab of concrete, 750 cubic feet of detention would be required.
Detention infrastructure, which collects water and temporarily holds it before slowly releasing it, could be in the form of ponds, rain barrels or underground culverts or pipes.
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