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<br />IV. PJDJEC'l'S POR WBIClI SP!' I!:8'1'DfA1'!B ARB ~ <br /> <br />e <br /> <br />~..ol. G1!:IfEJIAL. The pIU'PO.e to be ..ned b,. SPI' eetiate. are 41.- <br />cuuc. 'brietlf in paragrapha 1-06 IIDd 1-08. In e_ cue. the 8P1 .at1lllat. <br />ilia" hw Il. >>Jor 'bear1llg oa ..lectioza ot t~ C...1p tlood tor a particular <br />project, \l'hereu in other cu.. t~ eat1Mte M'1 .erve oDl1 u an 1n41cat1oa <br />ot tho, part1al degree ot protectioll propoaed tor the project. SPF eet1.lllatea <br />&no uset'a.l 1.D connection vith pr&Ctic~ all 1'1ood colrt.rol inT"lstigatione <br />'but to reduce the work required 'iD project at,'41ea, preparation ot SPF <br />eet1JD:!.tea 11 required only tor tOOa. project. iD which the propoaed dea1gll <br />!lood 11 ",ore thall one ot estUlated 25-year frequency. To further reduce <br />tile work iD""lved, appro:dlllate eat1m:J.tee are acceptable 1Ihere it ie apparellt- <br />that the design !lood 1s strictly l1lII1ted b;y ecOllOlll1c cOll.llideratiollll and <br />16 eubstant1ally less thall the SPF. The baah ot SPF estUlates ehould be <br />clearly stated 1.D each ease. <br /> <br />~..c2. ORDERS AI RmULATIOl'lS. f..lr eOnvelliel1ce in reterellcepar8Craph <br />4208.11 (Revised March 1951) 18 qllDted below: <br /> <br />"Describe any "standard project t'J.ood- eet1lllate eatabllllhed u a criter10ll <br />iD an&l.~ing tlood poseibllit1es and !lood control requiremelrt.e, give the <br />bade tor 1ts deri.....t10n and compare it with tlooca ot record and the <br />"design !lood" t1l1&lly selected u a basie tor the project design. Standaz'd <br />project 1'1ood detel'lllinet1ons will be prepared tor local flood protectiOll. <br />projects 1.Dtended to protect against floods (greater than thoee' having an <br />average trequency ot exceedence 111 the order ot once in 25 years, and euch <br />estimates vill be "ubm1tted to the Chiet ot EDg1neer. tor approval prior to <br />incorporation into the III1rvey report. Standard project flood est1lllates will <br />be prepared tor flood control and mul.tiple-purpose reeeno1rs, but III1ch <br />est1ma"es need not be III1blll1tt~d to the Chiet ot Ezlgineers tor advance approval <br />unless considered advisable by.t"e reporting officer. EatUlates v1ll be <br />prepared subortantially 111. accorda'~.ce vith technical iDst:ructione 1elll1ed b,. <br />the Chiet ot Engineers". <br /> <br />e <br /> <br />4-03. MAJOR DRAINAGE PROJEX:TS. In accordance with the O&R c1ted above, <br />SPF estimates will not be required tor "lIUt.Jor draiDllge" projects unless III1ch <br />projects serve uso to provide protection aga1net tlooda greater than tOOse <br />having average frequency ot approxUlately once in 25 years. <br /> <br />4..c4. LOCAL PKfl'ECTION PR)J'EX:TS. SPF detel'lllinatiOll.e are required tor <br />local protection projects included in survey reporte that are intended to <br />provide protection against tlooda greater thaD those having lID average tre- <br />quency ot occurrence ot approximately one in 25 years. SPF estimates ehould <br />uso be included in o..tinite Project '!leporte, de6ign IIlelIlOranda, and other <br />speciu reports pertaining to the select1011. ot design !lood criteria tor <br />local protection projects; in the evelrt. eetUlatee have been sUbmitted to OCE <br />in reports bearing specifically on SPF detel'lllinatiOllll, iDclusion ot appropriate <br />references and summaries ot rellUlts will 1U1't1ce tor report purposes, although <br />inclusion.ot details perta1ning to prior SPF eetu.tee u a matter ot record <br />is desirable where this can be accomplisbed vithout undue expense. <br /> <br />18 <br /> <br />e <br />