A treatise on highway construction . ri. h- UJUJ en \- co 2<CQCC Z3CQ CO CM C3 CkOSS-SECTIONS OF RoADS, ILLTJSTBATING DRAINAGE, ETC. and (7) whether it is permissible to back the water up aboTe theculvert, thereby causing it to discharge under a head. (1) It is the maximum rate of rainfall during the severeststorms which is required in this connection. This certainly varies 534 HIGHWAY C0irSTEUCTI02S. greatly in different sections, but there are almost no data to Blaowwhat it is for any particular locality, since records generally givethe amount per day and rarely per hour, while the durati
A treatise on highway construction . ri. h- UJUJ en \- co 2<CQCC Z3CQ CO CM C3 CkOSS-SECTIONS OF RoADS, ILLTJSTBATING DRAINAGE, ETC. and (7) whether it is permissible to back the water up aboTe theculvert, thereby causing it to discharge under a head. (1) It is the maximum rate of rainfall during the severeststorms which is required in this connection. This certainly varies 534 HIGHWAY C0irSTEUCTI02S. greatly in different sections, but there are almost no data to Blaowwhat it is for any particular locality, since records generally givethe amount per day and rarely per hour, while the duration of thestorm is seldom recorded. Further, probably the longer the seriesof observations the larger will be the maximum rate recorded,since the heavier the storm the less frequent its occurrence; andhence a record for a short period, however complete, is of but littlevalue in this connection. Further, the severest rainfalls are ofcomparatively limited extent, and hence the smaller the area. thelarger the possible maximum precipitation.
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