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<br />k lot z 4~~ ass 0 cia t e s <br /> <br />Note that regional detention for existing conditions is not proposed to remedy current <br />conditions because of the high cost (cost estimates are discussed in greater detail in <br />Section 5). This relative cost comparison can be readily seen if it is realized that regional <br />detention for a channel would have to be much larger than the channel widening <br />excavation volume. Thus, for example, for Taylor Bayou (AI04-00-00), the regional <br />detention requirement would be about 124 acre-feet (i.e., about 20 times larger than the <br />mitigation volume). The mitigation pond has an estimate cost of about $250,000, which <br />is approximately ten times the widening cost. <br /> <br />Regional detention requirements, assuming full development, with all runoff mitigation <br />to be provided by regional detention, is provided for future development conditions. <br />Exhibit 4-1, 4-2, and 4-3 shows undeveloped land where ponds might be located. Note <br />that Exhibits 4-1, 4-2, and 4-3 show numerous detention sites for the watersheds; <br />however all the identified sites are not needed. Estimated detention volume requirements <br />identified in Tables 4-1 and 4-2 can be met by multiple sites shown on the <br />aforementioned exhibits. A list of these potential detention sites is shown in Appendix C. <br /> <br />4-14 <br /> <br />Klotz Associates Project No. 0127.008.000 <br />January 2009 <br /> <br />La Porte Citywide Drainage Study <br />City of La Porte <br />