_REVISION - M1981302 (94) - Laserfiche WebLink

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22 4.3 INSPECTION OBSERVATIONS THAT MUST STRAIGHT BOWED 1 BE RECORDED LINE The visual inspection is performed to allow the dam I t, VIEWING / owner to be knowledgeable about the condition of his I 1 dam and to allow any problems to be identified when I I they begin to develop. An accurate and detailed des- cription of the condition of the dam observed during J(, each inspection will make possible meaningful com- parisons of conditions. MAN SIGHTING THROUGH EYES THROUGH EYF4 A!I measurements and descriptive details that are 2 3 required to portray an accurate picture of the dam's current condition must be recorded.This information falls into three categories: STRAIGHT BOWED T LOCATION — The location of any questionable area or condition must be accurately described to allow that area or condition to be properly evaluated. The location along the length of the dam, as well as # p height above the toe or distance down from the dam's 111 crest, must be established and recorded. The same MAN SIGHTING THROUGH EYES THROUGH EYp applies to conditions associated with the outlet or 4 5 6 J spillway. EXTENT OF AREA—The length,width,and depth FIGURE// I SIGHTING TECHNIQUE or height of any area where a suspected problem is When checking alignment on parts of the dam centet� found. eyes along the line being viewed. Sighting along the, DESCRIPTIVE DETAIL—Abriefyetdetaileddes- line, move from side to side a little to view the lick cription of a condition or observation must be given. from several angles. Some description items are: For example, sighting along the edge of the crest: QUANTITY OF DRAIN OUTFLOWS QUANTITY OF SEEPAGE FROM POINT AND AREA SOURCES F f i f COLOR OR QUANTITY OF SEDIMENT IN c o 0 0 WATER 0 o f o 0 0 DEPTH OF DETERIORATION IN CONCRETE I w 1 I I LENGTH, DISPLACEMENT, AND DEPTH OF u l u u I u l CRACKS I I I IS AREA MOIST, WET, OR SATURATED? IS PROTECTIVE COVER ADEQUATE? I / II II II IS SURFACE DRAINAGE ADEQUATE? t t t DO SLOPES LOOK TOO STEEP? DOES DETERIORATION APPEAR TO BE RAPID OR SLOW? HAVE CONDITIONS CHANGED? 1 2 3 4 The above listing of inspection findings that must be STRAIGHT BOWED recorded is not meant to be a complete list but is to FIGURE 4.4-2 SIGHTING ALONG CREST serve as a guide. Keep in mind that if the inspector Looking through a pair of binoculars will help to thinks a condition has changed since the last inspec- make changes more obvious. tion he must make note of it. He should also take a 4.5 SOME TYPICAL PROBLEMS photo and put it into his file,carefully noting the date and writing a description of the scene shown on the Various conditions are seen during the inspection that photo. may indicate a developing problem. A few of these 4.4 SIGHTING TECHNIQUE willbediscussedheretodemonstratewhattheinspec- tor needs to do and how the equipment should be A sighting technique similar to that used when select- helpful. ing straight pieces of lumber can be useful in identify- ing misalignments as well as high or low areas along a surface. The technique is illustrated.