17.7: Appendix G- The Coefficient a1

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**Table G-1: a₁ for h_b/h_i=1.**
h_b/h_i=1	φ	32^o	37^o	42^o	47^o	52^o
α	δ
15^o	15^o	0.525	0.520	0.515	0.509	0.503
	18^o	0.520	0.516	0.510	0.505	0.498
	21^o	0.516	0.511	0.506	0.500	0.494
	24^o	0.511	0.507	0.502	0.496	0.490
	27^o	0.507	0.503	0.498	0.492	0.485
	30^o	0.503	0.498	0.493	0.487	0.481
30^o	15^o	0.526	0.522	0.517	0.512	0.506
	18^o	0.523	0.519	0.514	0.509	0.503
	21^o	0.520	0.516	0.511	0.506	0.500
	24^o	0.517	0.512	0.508	0.502	0.497
	27^o	0.514	0.509	0.504	0.499	0.493
	30^o	0.510	0.506	0.501	0.496	0.490
45^o	15^o	0.534	0.530	0.525	0.520	0.514
	18^o	0.531	0.527	0.522	0.517	0.511
	21^o	0.528	0.524	0.519	0.514	0.508
	24^o	0.525	0.521	0.516	0.511	0.505
	27^o	0.523	0.518	0.513	0.508	0.501
	30^o	0.520	0.515	0.510	0.504	0.498
60^o	15^o	0.535	0.528	0.521	0.513	0.505
	18^o	0.530	0.524	0.517	0.509	0.500
	21^o	0.526	0.519	0.512	0.504	0.494
	24^o	0.521	0.515	0.507	0.498	0.489
	27^o	0.517	0.510	0.502	0.493	0.483
	30^o	0.512	0.505	0.497	0.487	0.477

The weigh factor a₁, for the determination of the weighted average permeability km, as a function of the blade angle α, the angle of internal friction φ, the soil/interface friction angle δ, for h_b/h_i=1.

**Table G-2: a₁ for h_b/h_i=2.**
h_b/h_i=2	φ	32^o	37^o	42^o	47^o	52^o
α	δ
15^o	15^o	0.522	0.518	0.513	0.507	0.501
	18^o	0.518	0.514	0.509	0.503	0.497
	21^o	0.514	0.510	0.505	0.499	0.493
	24^o	0.510	0.506	0.501	0.495	0.489
	27^o	0.506	0.502	0.497	0.491	0.485
	30^o	0.502	0.498	0.493	0.487	0.481
30^o	15^o	0.531	0.526	0.521	0.516	0.511
	18^o	0.527	0.523	0.518	0.513	0.508
	21^o	0.524	0.520	0.515	0.510	0.505
	24^o	0.521	0.517	0.512	0.507	0.501
	27^o	0.518	0.514	0.509	0.504	0.498
	30^o	0.514	0.510	0.506	0.500	0.495
45^o	15^o	0.554	0.550	0.546	0.541	0.536
	18^o	0.552	0.548	0.544	0.539	0.534
	21^o	0.550	0.546	0.542	0.537	0.532
	24^o	0.548	0.544	0.539	0.535	0.529
	27^o	0.546	0.542	0.537	0.532	0.527
	30^o	0.544	0.540	0.535	0.530	0.524
60^o	15^o	0.575	0.569	0.563	0.556	0.549
	18^o	0.571	0.566	0.559	0.552	0.545
	21^o	0.568	0.562	0.556	0.549	0.541
	24^o	0.565	0.559	0.552	0.545	0.536
	27^o	0.561	0.555	0.548	0.541	0.532
	30^o	0.558	0.552	0.544	0.536	0.527

**Table G-3: a₁ for h_b/h_i=3.**
hb/hi=3	φ	32^o	37^o	42^o	47^o	52^o
α	δ
15^o	15^o	0.522	0.517	0.512	0.507	0.501
	18^o	0.518	0.513	0.508	0.503	0.497
	21^o	0.514	0.509	0.504	0.499	0.493
	24^o	0.510	0.505	0.500	0.495	0.489
	27^o	0.506	0.501	0.497	0.491	0.485
	30^o	0.502	0.498	0.493	0.487	0.480
30^o	15^o	0.534	0.529	0.524	0.519	0.514
	18^o	0.531	0.526	0.521	0.516	0.511
	21^o	0.528	0.523	0.519	0.513	0.508
	24^o	0.525	0.520	0.516	0.511	0.505
	27^o	0.522	0.517	0.513	0.508	0.502
	30^o	0.519	0.514	0.510	0.504	0.499
45^o	15^o	0.552	0.548	0.544	0.540	0.536
	18^o	0.550	0.547	0.543	0.539	0.534
	21^o	0.549	0.545	0.541	0.537	0.532
	24^o	0.547	0.543	0.539	0.535	0.531
	27^o	0.545	0.542	0.538	0.533	0.529
	30^o	0.544	0.540	0.536	0.531	0.527
60^o	15^o	0.580	0.575	0.570	0.565	0.559
	18^o	0.578	0.573	0.568	0.563	0.557
	21^o	0.576	0.571	0.566	0.560	0.554
	24^o	0.573	0.569	0.564	0.558	0.551
	27^o	0.571	0.566	0.561	0.555	0.548
	30^o	0.569	0.564	0.558	0.552	0.545

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