Drainage Design Manual, Hydrology - Flood Control District of ...

More documents

Recommendations

Info

Drainage Design Manual for Maricopa County 100,000 Figure 8.9 100-YEAR PEAK DISCHARGE RELATION FOR FLOOD REGION 13 Adapted from data contained in USGS Open File Report 93-419 Hydrology: Indirect Methods 10,000 Peak Discharge, in cfs 1,000 100 Q100 LP3 Discharge Estimates 100-Year Peak Discharge Relation 10 0.1 1 10 100 1000 10000 Drainage Area, in square miles 8-18 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Indirect Methods 8.5 APPLICATIONS AND LIMITATIONS The three indirect methods can be applied to any watershed gaged or ungaged in Maricopa County. Limitations exist for the use of the Regional Regression Equations based on values of the watershed characteristics as compared to the values of watershed characteristics that were used to derive these regional regression equations. The interpretation and evaluation of the results of these methods must be conducted with awareness of several factors. 1. It must be noted that these are empirical methods and the results are only applicable to watersheds that are hydrologically similar to the database used to derive the particular method. 2. The majority of the data in all three of these methods are for undeveloped, unregulated watersheds. Urbanized watersheds can have significantly higher discharges than the results that are predicted by any of these methods. 3. These methods (other than envelope curves) produce discharge values that are statistically based averages for watersheds in the database. Conditions can exist in any watershed that would produce flood discharges, either larger than or smaller than, those indicated by these methods. Watershed characteristics that should be considered when comparing the results of indirect methods to results by analytic methods and/or flood-frequency analysis are: a. The occurrence and extent of rock outcrop in the watershed. b. Watershed slopes that are either exceptionally flat or steep. c. Soil and vegetation conditions that are conducive to low rainfall losses, such as clay soils, thin soil horizons underlain by rock or clay layers, denuded watersheds (forest and range fires), and disturbed land. d. Soil and vegetation conditions that are conducive to high rainfall losses, such as sandy soil, tilled agricultural land, and irrigated turf. e. Land-use, especially urbanization, but also mining, large scale construction activity, and over-grazing. f. Transmission losses that may occur in the watercourses. g. The existence of distributary flow areas. h. Upstream water regulation or diversion. August 15, 2013 8-19
Page 1:
Cover Page Drainage Design Manual f
Page 4 and 5:
Drainage Design Manual for Maricopa
Page 6 and 7:
Page 8 and 9:
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Page 88 and 89: Drainage Design Manual for Maricopa
Page 188 and 189:
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Page 214 and 215:
Page 216 and 217:
R09E R10E T02S R07E R01W R04E R06E
Page 218 and 219:
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
Page 232 and 233:
Page 234 and 235:
Page 236 and 237:
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 254 and 255:
Page 256 and 257:
Page 258 and 259:
Page 260 and 261:
Page 262 and 263:
Page 264 and 265:
Page 266 and 267:
Page 268 and 269:
Page 270 and 271:
Page 272 and 273:
Page 274 and 275:
Page 276 and 277:
Page 278 and 279:
111 34 30 27 26 Drainage Design Man
Page 280 and 281:
111 18 Drainage Design Manual for M
Page 282 and 283:
111 36 26 27 28 24 27 32 Drainage D
Page 284 and 285:
111 38 45 32 30 38 Drainage Design
Page 286 and 287:
111 28 32.5 22 20 22 22 18 Drainage
Page 288 and 289:
111 32 Drainage Design Manual for M
Page 290 and 291:
111 55 65 60 47 Drainage Design Man
Page 292 and 293:
Page 294 and 295:
Page 296 and 297:
Page 298 and 299:
Page 300 and 301:
Page 302 and 303:
Page 304 and 305:
Page 306 and 307:
Page 308 and 309:
Page 310 and 311:
Page 312 and 313:
Page 314 and 315:
Page 316 and 317:
Page 318 and 319:
Page 320 and 321:
Page 322 and 323:
Page 324 and 325:
Page 326 and 327:
Page 328 and 329:
Page 330 and 331:
Page 332 and 333:
Page 334 and 335:
Page 336 and 337:
Page 338 and 339:
Page 340 and 341:
Page 342 and 343:
Page 344 and 345:
Page 346 and 347:
Page 348 and 349:
Page 350 and 351:
Page 352 and 353:
Page 354 and 355:
Page 356 and 357:
Page 358 and 359:
Page 360 and 361:
Page 362 and 363:
Page 364 and 365:
Page 366 and 367:
Page 368 and 369:
Page 370:
show all

Drainage Design Manual, Hydrology - Flood Control District of ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?